San Geronimo, CA Climate


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United States / California / San Francisco-Oakland-Berkeley Metro Area / Marin County / San Geronimo / Zip Codes
San Geronimo, CA has a temperate climate with mild winters and warm summers. Average temperatures in the summer months range from the mid-sixties to the lower seventies, while winter temperatures typically stay in the mid-fifties and above. The area receives an average of 11 inches of rainfall per year, with most of it occurring during the late fall and winter months. San Geronimo is located in a mountainous region so there can be significant variations in temperature depending on altitude. Snowfall is rare but possible throughout the winter months as well.

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for San Geronimo is 8.5 (10=best), which means it is more comfortable than most places in California.

9.6 Summer - 7.1 Winter
August, July and September are the most pleasant months in San Geronimo, while January and December are the least comfortable months.

  ClimateSan Geronimo, CaliforniaUnited States
  40.5 in.38.1 in.
  0.0 in.27.8 in.
  77.8 days106.2 days
  260 days205 days
  79.1°85.8°
  41.7°21.7°
  8.57
  5.24.3
  302 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

August is the hottest month for San Geronimo with an average high temperature of 79.1°, which ranks it as cooler than most places in California. In San Geronimo, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Geronimo are September, July and August.
In San Geronimo, there are 13.7 days annually when the high temperature is over 90°, which is cooler than most places in California.
January has the coldest nighttime temperatures for San Geronimo with an average of 41.7°. This is warmer than most places in California.
In San Geronimo, there are 2.5 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.
In San Geronimo, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.
Humidity in San Geronimo is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are August, July and June.
December is the wettest month in San Geronimo with 8.3 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 59% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 40.5 inches in San Geronimo means that it is wetter than most places in California.
January is the rainiest month in San Geronimo with 12.8 days of rain, and July is the driest month with only 0.9 rainy days. There are 77.8 rainy days annually in San Geronimo, which is rainier than most places in California. The rainiest season is Spring when it rains 48% of the time and the driest is Autumn with only a 5% chance of a rainy day.
There is rarely any recorded snowfall in San Geronimo, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in San Geronimo.
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