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    <title>Layer up: San Francisco experiences coldest summer in 30 years</title>
    <dc:date>2025-07-25T03:17:47+00:00</dc:date>
    <link>https://sfstandard.com/2025/07/23/san-francisco-cold-summer/</link>
    <dc:creator>robertogreco</dc:creator><description><![CDATA["The city hasn't seen early-summer temperatures this low in three decades.

[image: "A person in a hoodie walks on a foggy beach near the shoreline. In the background, a large bridge looms faintly in the mist. It’ll likely stay this cold for the foreseeable future, a meteorologist said. | Source: Justin Sullivan/Getty Images"]

Damn, is it chilly.

Even in a city known for frigid summers, the last few months have been unseasonably cold. The period from May to mid-July was the region’s coldest in more than 30 years, according to Roger Gass, a meteorologist at the National Weather Service.

So all you twentysomethings, layer up: You’re living through the coolest San Francisco summer of your lives. 

“We’re not seeing any considerable warm-up in the near future,” Gass said. “I would expect us to get some warm events in August and September, but it’s very hard to predict this far out.”

Downtown San Francisco this month has seen an average temperature of 59 degrees, NWS data shows. Gass said a low-pressure system over the coast is pushing chilly ocean air into the city, which typically heats up in the late summer as offshore winds start to push out the marine layer.

[image: "A group of people walks casually down a street. They wear casual clothing, and one person is holding a phone. A historic streetcar is in the background. Visitors are bundling up at Fisherman's Wharf. | Source: Justin Sullivan/Getty Images"]

Locals are feeling the effects. So are visitors.

Nick Brooks, who manages the $10 Hoodie Store at Fisherman’s Wharf, has seen the weather phenomenon Gass explained firsthand. He said unprepared tourists often flock to his shop after being caught layerless. 

“That water gets cold, and when the wind comes up, it comes right down this block like a river,” Brooks said from Jefferson Street. “It’s freezing, especially when it gets later in the day.”

[image: "The image shows mannequins displaying San Francisco-themed hoodies and shirts. A person with long hair walks by, wearing a black and red jacket. Chilly summers are good for hoodie purveyors. | Source: Justin Sullivan/Getty Images"]

Even residents of the city’s typically toastier neighborhoods are feeling the chill.

“I have so many cute summer tops that I can’t wear,” said Isabella Borkovic, a 22-year-old software engineer who lives in the Lower Haight. 

The South Bay native, who moved to the city a year ago, said she has started dropping the phrase “June gloom” in conversations daily.

“There’s not even a corresponding phrase for July, but there should be,” Borkovic said while on a break from work in the Mission. “All my coworkers, every time I complain, they’re like, ‘Just wait, Isabella, it’ll get better in August.’ But I’m starting to not believe them.”

(Bad news, Isabella: They’re lying to you.) [https://sfstandard.com/opinion/2024/08/10/august-is-the-best-month-of-the-year-in-san-francisco-just-ask-karl-the-fog/ ]

[image: "A foggy city skyline with tall buildings is partially obscured by mist. Two birds are flying in the foreground against the overcast sky.
Downtown San Francisco this month has seen an average temperature of 59 degrees. | Source: Justin Sullivan/Getty Images"]

Not everyone is daunted by the diminished temperatures. Pete Sferra, a nudist who frequents the Castro, said it’s been business as usual for him and his layer-averse comrades.

“I’ve actually been enjoying quite a few nude strolls this year,” he said. “I just pick and choose the days.”

Sferra has logged 963 nude walks in his journal. He expects to hit 1,000 by the end of the year. But even he is selective about nude-strolling weather.

“I’m not going to be out there on the street if it’s freezing,” he said, “but we get plenty of weather that’s nice enough to go roam around au naturel.”

[image: "A foggy beach scene with a sandy shore, a few people walking, and scattered trees. Distant buildings and a misty skyline are visible in the background. It's particularly frigid along the west side, where a low-pressure system is blowing in ocean air. | Source: Justin Sullivan/Getty Images"]"]]></description>
<dc:subject>weather sanfrancisco 2025 summer june july august fogus junegloom climate fog tomokichiengeorgekelly microclimates</dc:subject>
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    <title>Cutting Through the Fog -</title>
    <dc:date>2025-07-25T02:43:57+00:00</dc:date>
    <link>https://baynature.org/article/cutting-through-the-fog/</link>
    <dc:creator>robertogreco</dc:creator><description><![CDATA["In 1962, Harold Gilliam, dean of Bay Area environmental journalists and columnist for the San Francisco Chronicle, wrote the definitive Weather of the San Francisco Bay Region. Now Gilliam and University of California Press have issued a thoroughly updated version of this classic work. Following are excerpts from the book, arranged by Bay Nature to tell the story of the forces that produce the Bay Area’s signature climatic phenomenon—fog. (Reprinted by permission of University of California Press.)

In the San Francisco Bay Region, the characteristic summer fog is widely regarded as a boon and a blessing, bring the clean, salty aroma of the Pacific and keeping the days refreshingly cool as it advances from the ocean in fantastic flowing forms that from day to day are unique and unpredictable. Shaped by the slant of the California coastline and the oceanic currents of wind and water, by the presence of a strait and estuary penetrating the coastal mountain ranges, and by the hill-and-valley contours of San Francisco and the Bay Region, the advance of the summer fog inland from the Pacific is one of the planet’s most awesome natural spectacles.

A Unique Climate

The causes of this unique spectacle lie in California’s extraordinary geography. In general, the state has a Mediterranean climate, with mild, wet winters and dry summers. But that general type is locally modiﬁed by special features of the landscape. The Golden Gate is the only complete breach in the Coast Range, which borders the Paciﬁc for most of California’s length. As a result, the Bay Region is the meeting place of continental and oceanic air masses. Through the funnel of the Golden Gate and San Francisco Bay, the immense aerial forces of sea and land wage a continual war, and the tide of battle often ﬂows back and forth with regularity. The line between the two types of air masses, particularly in summer, may zigzag through the streets of San Francisco and extend in similarly erratic fashion across the entire region.

The reason for the zigzags is the complex topography of the Coast Range, which modiﬁes the basic struggle between air masses of land and sea in intricate ways. In general, the Coast Range in this region is a double chain of mountains running north and south (or, more precisely, north-northwest and south-southeast). Between the two chains lies the basin of San Francisco Bay. North and east of the Bay, the range is further subdivided into subsidiary chains.

Eastward from the ocean, over the several ranges, each successive valley has less of a damp, seacoast climate and more of a dry, continental climate—hotter in summer and colder in winter. But this basic pattern is further modiﬁed and complicated by a number of gaps and passes in the ranges—the most important of which is the Golden Gate—that allow the easy penetration of seacoast weather inland.

The Pacific High

During March, April, and May, as the days grow longer, the northward-moving sun heats the continent day by day, melting mountain snows and causing ﬂowers to bloom and fruit to bud across foothills and plains and deserts. In the Central Valley of California, a 500-mile-long basin surrounded by mountains, the heated air rises. Through a complicated interchange of pressure systems in the upper atmosphere, the result is falling pressure at ground level in the Valley. Weather Service forecasters mark the Valley on their maps with a large L for low pressure.

Out over the Paciﬁc, air warmed by the hot sun over the Equator rises and heads northward toward the Arctic. Some of it cools off and sinks to the ocean surface several thousand miles to the north, where it becomes the Paciﬁc High—a “mountain” of cool air weighing heavily on the water surface. Marked by a big H on the weather maps, the Paciﬁc High usually occupies a position somewhere between San Francisco and the Hawaiian Islands. The result of this differing pressure is what the meteorologists call an “onshore pressure gradient.” Just as water tends to seek its own level, so air tends to equalize its pressure, moving horizontally from a high-pressure area to a low-pressure area, or from a cool to a warm zone. So in the Bay Region, the air rushes from the cool ocean toward the warming continent.

Ocean Upwelling

Like everything else moving on the surface of the earth, the winds coming from the Pacific High toward the continent are affected by the Coriolis force (a product of the rotation of the earth), which causes the wind—and the ocean currents borne along by it—to curve to the right (clockwise) across the surface. The northwest wind blowing down the California coast pushes the surface of the ocean before it and creates a strong current running southward down the shoreline like a river. Due to the Coriolis force, during the summer months the southward-moving current veers offshore. In order to replace the surface currents moving away from the coast, masses of water surge up from the bottom of the ocean, creating a continual fountain of upwelling waters.

This bottom water, coming from depths of several hundred feet, may be 10 to 15 degrees colder than the sun-warmed sea surface. Summer swimmers at Northern California beaches are painfully aware that these waters are frigid—often in the mid 50s—compared to the temperatures of the surf along the beaches of Southern California, which are beyond the principal zone of upwelling and frequently reach the 70s. In some areas where the upwelling is intense, the water in summer is colder than in winter, when the upwelling is minimal.

This streak of cold water along the coast is a basic part of the Bay Region’s summertime air-conditioning system. The wind from the northwest, skimming thousands of miles of ocean, absorbs great quantities of moisture that has evaporated from the surface. The moisture is suspended in the moving air as invisible vapor. When it approaches the coast, the air comes into contact with the cold, upwelled waters and is itself cooled off, causing its invisible vapor to condense into visible droplets. The droplets cling to the minute particles of salt that have been thrown into the air with the spray. As the wind blows over the cold surface, the drops continue to form until they create a haze, which soon thickens into fog. The same process that causes moisture to form on the outside of a glass of cold water takes place here on a mammoth scale.

The Great Fog Bank

The result is the great fog bank that envelops most of the California coast intermittently during late spring and summer. It may range in width from a hundred yards to more than a hundred miles; in height, from a hundred feet to half a mile. In the beginning, however, it takes form merely as puffs and wisps of vapor that drift landward and cling to the shoreward slopes of the coastal hills or hang over the beaches. Then, as the season advances and the wind increases, the entire process accelerates; the separate vapors merge into a solid mass that steals up the coastal canyons in late afternoon or early evening when the sun’s rays are no longer strong enough to burn it off. In some of the canyons, it collects on the branches of the redwoods and drips to the ground, keeping the earth damp. The big trees thrive on this moisture. Redwood country is fog country; Sequoia sempervirens rarely grows naturally beyond the range of the sea fog.

Along most of the Coast Range, the sea air and its fog reach the heads of the canyons and are stopped by the higher ridges from penetrating farther inland. But at the Golden Gate, the only sea-level breach in the mountains, the wind moves through the range, bringing with it the masses of condensed moisture. At the maximum, an estimated million tons of water an hour ﬂoat through the Gate as vapor and fog, enveloping the deck of the Golden Gate Bridge and swallowing ships and shores as it advances. But the fog itself is not the primary element at work. It is created by and borne upon the wind. When the wind is sufficiently laden with moisture and sufficiently cooled by the water, the fog comes into being and is carried inland by the moving air.

Fantastic fog forms may develop as the advancing white mass encounters obstacles. It may come in surges like a slow-motion surf, exploding into spray on the ridge at the north end of the Golden Gate Bridge, forming a standing wave over Sausalito, whirling horizontally in eddies around promontories, and pouring over Twin Peaks and the Peninsula hills, where it forms fog falls and fog cascades down the leeward slopes. If it comes in low on the Bay surface, it is likely to billow in domes over Alcatraz and Angel islands. At times a fog deck will appear part way up the Berkeley Hills and build out toward the Bay.

The Fog Cycle

Week by week from spring into August, the forces that produce the fog increase in intensity. The Paciﬁc High moves farther north, closer to the latitude of San Francisco, sending out stronger winds; offshore the up-welling of cold bottom waters increases, condensing the winds’ moisture into thicker masses of fog; in the Central Valley, the northward-moving sun sends temperatures to the 100 degree mark and beyond. The hot air rises, sucking cool masses in great drafts through the only break in the Valley’s surrounding mountains, San Francisco Bay. With the ocean air comes the fog, evaporating gradually in the hot, dry air of the Valley, but sometimes penetrating at night as far as Sacramento and Stockton.

The fog seems to come and go in cycles. Until recent years, the conventional explanation for the fog’s behavior was a simple one: as the cool, fog-bearing ocean air is pulled over the coastal hills and across the Bay toward the hot Central Valley (that is, from a high-pressure to a low-pressure area), the nearest parts of the Valley begin to cool off after a few days, much as a draft from an open door lowers the temperature in a warm room.

The incoming cool, heavy sea air replaces the warm, rising land air, and temperatures in Sacramento and Stockton may drop from well above 100 degrees to the “cool” 90s. When the Valley cools sufficiently, the fog-producing machinery breaks down. Without the intense Valley heat to draw the sea air in through the Bay Region, the wind diminishes and no longer carries the fog inland. San Francisco, the Golden Gate, and the coastline are fog free

Then the process starts all over again. Without the incoming wind and fog, the sun gradually reheats the Valley. The rising warm air again begins to attract the foggy marine air inland. The result is a fog cycle of about a week in length, producing roughly three or four days of fog over the Bay and three or four days of sun.

However, the foggy or sunny spells sometimes persist for weeks, with no apparent cyclic regularity. With increasing knowledge of the workings of the upper atmosphere, meteor-ologists have learned that although the fog penetration is related to the alternate heating and cooling of the Central Valley, it is also inﬂuenced by much larger forces in the global weather picture, such as changes in the jet streams that encircle the globe.

Usually, however, the delicate balance of forces governing the Bay Region’s weather is maintained, giving the area, at the gateway between the land and the sea, its incomparable combination of continental and maritime climates, dryness and dampness, sun and fog, heat and cold."]]></description>
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<item rdf:about="https://www.sfchronicle.com/projects/2025/sf-weather-microclimates/">
    <title>Here’s a guide on where to live in San Francisco based on weather</title>
    <dc:date>2025-07-25T00:33:15+00:00</dc:date>
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    <dc:creator>robertogreco</dc:creator><description><![CDATA["The Chronicle explores six iconic San Francisco microclimates and the fog and wind patterns that shape them."

[archived:
https://archive.ph/orzdt ]

"Mission District
The city’s warmest neighborhood

The Mission District is San Francisco’s closest impression of Los Angeles, and not just because of the excellent tacos. San Francisco’s only public outdoor swimming pool is located in the heart of the Mission, and for good reason.

A citizen mapping project found that the Mission is the city’s warmest neighborhood, where temperatures often run 10 to 15 degrees higher than Ocean Beach. During the most extreme heat waves, which happen roughly once every couple of years, the Mission is the San Francisco neighborhood most likely to experience triple-digit temperatures.

Heat gets trapped in the neighborhood, which is protected from the fog on multiple sides by large hills. On a warm summer day, Dolores Park could be mistaken for a beach, with picnic blankets, margaritas and swimwear.

Other similar weather neighborhoods include Noe Valley, Bayview, Portola and Visitacion Valley.

Twin Peaks
Located squarely in the fog path

Do you want an eagle’s eye view of San Francisco and a taste of all of its microclimates? If so, Twin Peaks might be for you.

Located squarely in the fog path, a summer afternoon atop Twin Peaks can feel like a midwest winter day. Tourists expecting to take in sweeping views of San Francisco Bay at Christmas Tree Point are often treated to a biting wind chill and near-zero visibility instead. Gusts can top 50 mph at the viewpoint and 30 mph in the neighborhood.

But just as the hills are battered by stiff winds during summer, fall heat waves hit with force. Temperatures above the marine layer can stay in the 80s at night during the most extreme hot spells making for miserable sleeping weather in a city without widespread air conditioning. But these hot spells are often accompanied by extraordinary clear skies and sweeping views of the Golden Gate Bridge, Mount Diablo and San Francisco Bay.

Other similar weather neighborhoods include Golden Gate Heights and Diamond Heights.

Marina
San Francisco’s flattest neighborhood

Wind is the distinguishing fact of life in the Marina. Temperatures can vary substantially in the Marina from day to day depending on the extent of clouds and the strength of winds, but a light breeze of at least 15 mph is nearly a daily occurrence during the afternoon from roughly April through September.

As San Francisco’s flattest neighborhood, the Marina is ideal for running and cycling, but the wind can make that a little more difficult, as a headwind is nearly a guarantee when climbing toward the Golden Gate Bridge.

The neighborhood offers picturesque views of the Golden Gate Bridge, where fog often lingers over the iconic structure while the shoreline stays sunny.

Other similar weather neighborhoods include Cow Hollow, Pacific Heights and Russian Hill.

Outer Sunset
Winds consistently blow

Chilly fog and blowing sand. That’s beach weather, San Francisco style.

Sweatshirts are just as necessary as sandals at Ocean Beach, which is located at the edge of the Outer Sunset. Temperatures struggle to hit 60 degrees on many summer days in the neighborhood, with consistent 10 to 20 mph winds. Many days feature even stronger gusts.

Mornings often start foggy in the neighborhood before skies gradually brighten by noon. On the foggiest days, though, areas west of 19th Avenue can remain completely overcast. When winds pick up during the late afternoon and evening, fog tends to thicken and temperatures drop.

Other similar weather neighborhoods include the Richmond District and Lakeshore.

Haight-Ashbury
Highs are typically in the low to mid-60s

If you’re looking for cool, cloudy sleeping weather and midday sunshine, Haight-Ashbury is the neighborhood for you.

Far enough east to avoid the perpetual gray coastal clouds, Haight-Ashbury also benefits from being close enough to the ocean to capture some of the cool breeze that blows up Golden Gate Park. Skies tend to clear in the mid-morning in the neighborhood and stay mainly sunny until the evening before fog makes its nightly return.

Highs are typically in the low to mid-60s here, but the Haight’s distance from the water makes it one of the hottest neighborhoods during heat waves.

Haight Street is also prone to flooding during heavy rain when water rushes down from Buena Vista Park and overwhelms storm drains.

Other similar weather neighborhoods include NOPA, Lower Haight, Duboce Triangle and Excelsior.

SOMA
Westerlies swirl around buildings

South of Market is one of San Francisco’s sunniest and warmest neighborhoods in the summer, but it is also prone to damage from winter storms.

During summer, clouds are first to part over SoMa as the sky clears from east to west throughout the morning. Temperatures often reach close to 70 degrees in the neighborhood while western parts of the city are stuck in a chilly fog. And when winds kick up in the summer, westerlies swirl around buildings because of SoMa’s diagonal grid layout, creating miniature tornadoes of blowing leaves and trash.

While SoMa gets warm during summer, it’s one of the San Francisco neighborhoods most prone to flooding during storms. Just like westerly winds tend to whip around the blocks in the summer, southerly winds do the same in winter, making this neighborhood one of the city’s messiest during a winter storm.

Other similar weather neighborhoods include North Beach, Mission Bay and Potrero Hill.

Bonus: Oakland
A little more heat and a bit less fog

Do you want San Francisco’s weather with a little more heat and a bit less fog? Head to Oakland.

With temperatures running an average of 5 degrees higher than downtown San Francisco during summer, Oakland frequently flirts with the low 70s on a typical summer day. There are temperature variations in the town, too, where a bay breeze keeps West Oakland slightly cooler than Lake Merritt.

Diablo winds can rock Oakland during the fall, when dry nighttime gusts coming over the hills sometimes eclipse 40 mph in the Montclair neighborhood and around Mills College. Winter storms tend to hit Oakland similarly to San Francisco, with both cities averaging roughly 23 inches of rain per year."]]></description>
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    <title>Milo's guide to a cloud chasing on BART - YouTube</title>
    <dc:date>2025-07-07T16:23:37+00:00</dc:date>
    <link>https://www.youtube.com/watch?v=w8ufdVHA45s</link>
    <dc:creator>robertogreco</dc:creator><description><![CDATA["We invited our biggest fans to show us their favorite things to do on BART during summer break!  

Milo took us Cloud Chasing! Enjoy this tour of the Bay Area’s microclimates and spreading the love of fog. 🌫️  

Stay tuned for more BART Summer guides featuring other participants in the Autism Transit Project. Last week Zayn took us around Berkeley for bagels, books and frozen yogurt. Find the video in our pinned reels. 

Every spring we invite local youth on the autism spectrum to BART HQ to learn more about transit and record station announcements for Autism Acceptance Month!"]]></description>
<dc:subject>trains bart clouds weather sanfrancisco eastbay bayarea 2025 cloudchasing fog microclimates climate buses transit muni sfmta publictransit transportation</dc:subject>
<dc:source>https://pinboard.in/</dc:source>
<dc:identifier>https://pinboard.in/u:robertogreco/b:eb012245f408/</dc:identifier>
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<item rdf:about="http://idlewords.com/2012/02/bia%C5%82owie%C5%BCa_forest.htm">
    <title>Białowieża Forest (Idle Words)</title>
    <dc:date>2012-02-20T06:20:32+00:00</dc:date>
    <link>http://idlewords.com/2012/02/bia%C5%82owie%C5%BCa_forest.htm</link>
    <dc:creator>robertogreco</dc:creator><description><![CDATA["One August morning in 2010 I woke up before dawn to go bushwhacking near the Belarussian border. My guide…was waiting outside to take me into one of the last patches of primeval wilderness in Europe, Białowieża Forest."

"The forest is sensitive to small changes in microclimate & soil chemistry. They determine which species of tree will grow best, & the trees in turn affect everyting else. Some of them engage in ruthless chemical warfare, dropping leaves or seeds that poison the soil for their rivals, or attracting animals to trample the competition. Others suction up water at a prodigious rate to dry out their neighbors. The forest is one giant monument to plant’s inhumanity to plant."

"Apart from a blade of bisongrass, each bottle of this vodka also includes an implicit raised middle finger to the Latin alphabet, in the form of the magnificent Polish word źdźbło (blade of grass). That last vowel represents the rest of the word laughing at you after you have tried to pronounce it."
]]></description>
<dc:subject>bisongrass europe history hunting wilderness primevalwilderness microclimates 2010 2012 białowieżaforest forest forests poland maciejceglowski maciejcegłowski</dc:subject>
<dc:identifier>https://pinboard.in/u:robertogreco/b:dd0dd7caa60a/</dc:identifier>
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