Alameda County, CA Climate

Alameda County, CA has a mild climate year-round with temperatures rarely reaching extreme highs or lows. In the summer months, temperatures are usually in the mid to high 70s with occasional heat waves increasing the temperature to around 90°F. In winter months, temperatures typically range from the mid-50s to low 60s making it a great place for outdoor activities all year round. The county receives an average of 22 inches of rain per year and experiences little snowfall. With its closeness to the Pacific Ocean, Alameda County offers a unique blend of foggy summers and sunny winters that make its climate perfect for many outdoor activities.

Alameda County, California gets 22 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Alameda County averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 260 sunny days per year in Alameda County. The US average is 205 sunny days.

Alameda County gets some kind of precipitation, on average, 66 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 75 degrees
Winter Low: the January low is 43
Rain: averages 22 inches of rain a year
Snow: averages 0 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Alameda County is 8.7 (10=best), which means it is more comfortable than most places in California.

9.7 Summer - 7.5 Winter

September, August and July are the most pleasant months in Alameda County, while January and December are the least comfortable months.

Climate	Alameda, California	United States
	21.7 in.	38.1 in.
	0.0 in.	27.8 in.
	65.7 days	106.2 days
	260 days	205 days
	74.9°	85.8°
	42.6°	21.7°
	8.7	7
	5.4	4.3
	834 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.

September is the hottest month for Alameda County with an average high temperature of 76.3°, which ranks it as cooler than most places in California. In Alameda County, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Alameda County are September, August and July.

In Alameda County, there are 10.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

January has the coldest nighttime temperatures for Alameda County with an average of 42.6°. This is warmer than most places in California.

In Alameda County, there are 2.8 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Alameda County, 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 Alameda County 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 September.

February is the wettest month in Alameda County with 4.1 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 56% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 21.7 inches in Alameda County means that it is wetter than most places in California.

December is the rainiest month in Alameda County with 10.9 days of rain, and July is the driest month with only 0.2 rainy days. There are 65.7 rainy days annually in Alameda County, which is rainier than most places in California. The rainiest season is Spring when it rains 49% of the time and the driest is Autumn with only a 2% chance of a rainy day.

There is rarely any recorded snowfall in Alameda County, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in Alameda County.

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