September is the hottest month for Castro Valley with an average high temperature of 77.3°, which ranks it as cooler than most places in California. In Castro Valley, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Castro Valley are September, August and July.

August is the hottest month for Bothell with an average high temperature of 76.5°, which ranks it as about average compared to other places in Washington. In Bothell, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Bothell are August, July and September.

January has the coldest nighttime temperatures for Castro Valley with an average of 41.6°. This is warmer than most places in California.

December has the coldest nighttime temperatures for Bothell with an average of 35.0°. This is warmer than most places in Washington.

In Castro Valley, there are 12.0 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Bothell, there are 1.8 days annually when the high temperature is over 90°, which is cooler than most places in Washington.

In Castro Valley, there are 3.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Bothell, there are 31.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Washington.

In Castro Valley, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

In Bothell, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Washington.

February is the wettest month in Castro Valley with 4.0 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 55% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 21.3 inches in Castro Valley means that it is wetter than most places in California.


November is the wettest month in Bothell with 6.4 inches of rain, and the driest month is July with 1.0 inches. The wettest season is Spring with 37% of yearly precipitation and 10% occurs in Autumn, which is the driest season. The annual rainfall of 40.8 inches in Bothell means that it is about average compared to other places in Washington.

December is the rainiest month in Castro Valley with 11.6 days of rain, and July is the driest month with only 0.1 rainy days. There are 66.0 rainy days annually in Castro Valley, which is rainier than most places in California. The rainiest season is Spring when it rains 51% of the time and the driest is Autumn with only a 2% chance of a rainy day.

November is the rainiest month in Bothell with 19.2 days of rain, and August is the driest month with only 5.6 rainy days. There are 162.3 rainy days annually in Bothell, which is about average compared to other places in Washington. The rainiest season is Spring when it rains 32% of the time and the driest is Autumn with only a 14% chance of a rainy day.

There is rarely any recorded snowfall in Castro Valley, ranking it as one of the least snowy places in California.

An annual snowfall of 3.7 inches in Bothell means that it is less snowy than most places in Washington.

Any measurable snowfall is a rare occurance in Castro Valley.

December is the snowiest month in Bothell with 1.8 inches of snow, and 4 months of the year have significant snowfall.

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