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The most rainfall in one month was 16.13 inches (410 mm) in December 1955. [33] Climate data for Napa, California (Napa County Airport), 1991–2020 normals, extremes ...
This is a list of cities by average temperature (monthly and yearly). The temperatures listed are averages of the daily highs and lows. Thus, the actual daytime temperature in a given month may be considerably higher than the temperature listed here, depending on how large the difference between daily highs and lows is.
Summers in inland California can see temperatures well over 100 °F (38 °C) during the day and less than 0.3 in (7.6 mm) of monthly rainfall, particularly in the southern areas. This makes them prone to wildfires .
Temperatures in the first three months of 2025 could feature an overall colder Northwest and milder-than-average South and East contrast, but there is some possible month-to-month variability ...
California's average temperature for July was the hottest on record since 1895, according to new data from NOAA. ... with an average monthly temperature of 93.5 degrees. The prior record was 92.5 ...
The record high temperature of 118 °F (47.8 °C) occurred on September 6, 2022. The record low temperature of 10 °F (−12.2 °C) was recorded on December 11, 1932. Calistoga has a hot-summer Mediterranean climate (Csa) according to the Köppen climate classification system.
Colder temperatures, especially in winter months, won’t cause a common cold. But they can weaken your immune system, and colder, drier air can help respiratory viruses thrive.
The National Weather Service has a cooperative weather station in St. Helena. Winters are cool and wet, while summers have hot days and cool nights with little precipitation. Average temperatures in December, the coldest month, range from 58.3 °F (14.6 °C) to 39.6 °F (4.2 °C).