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Statewide records. The highest temperature ever recorded in California was 134 °F (57 °C) in Death Valley on July 10, 1913. This is also the highest temperature ever recorded on Earth. The lowest was −45 °F (−43 °C) in Boca on January 20, 1937. Climate data for California.
San Francisco: 20 March 1998 ... Coldest summer (month of July in the Northern Hemisphere): −33 °C (−27.4 °F); Summit Camp, Greenland on 4 July 2017.
San Francisco, for example, has an exceptionally long seasonal lag in the summer, with average daily temperatures peaking in September, and October as its second-warmest month, but very little seasonal lag in the winter, with the lowest temperatures in December and January, around and soon after the winter solstice.
The California Current ( Spanish: Corriente de California) is a cold water Pacific Ocean current that moves southward along the western coast of North America, beginning off southern British Columbia and ending off southern Baja California Sur. It is considered an Eastern boundary current due to the influence of the North American coastline on ...
San Francisco fog. Fog is a common weather phenomenon in the San Francisco Bay Area as well as along the entire coastline of California extending south to the northwest coast of the Baja California Peninsula. The frequency of fog and low-lying stratus clouds is due to a combination of factors particular to the region that are especially ...
June Gloom. June Gloom conditions prevailing at Seal Beach in late morning, June 2013. June Gloom is a mainly Southern California term for a weather pattern that results in cloudy, overcast skies with cool temperatures during the late spring and early summer. While it is most common in the month of June, it can occur in surrounding months ...
As such, the warmest summer weather is delayed until August, even September in many areas of the California coast; on average, September is the warmest month in San Francisco. Upwelling of cold Pacific waters also contributes to the frequent cool spring and early summer weather in coastal California.
Extreme cold killed humans and animals. Some people got lost near their houses and froze to death very near their front doors. The winter weather even reached the West Coast, with snowfall of 3.7 inches in downtown San Francisco setting an all-time record on February 5, 1887.