Clayton, CA Climate

Clayton, CA has a Mediterranean climate with mild and wet winters and hot, dry summers. Average winter temperatures range from the low 40s to the mid 50s Fahrenheit while summer temperatures can reach into the high 80s or even 90s. On average, Clayton receives around 22 inches of rain per year with July being the driest month. Snowfall is not a common occurrence in Clayton however it does occasionally occur in higher elevations nearby.

Clayton, California gets 19 inches of rain, on average, per year. The US average is 38 inches of rain per year.

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

On average, there are 257 sunny days per year in Clayton. The US average is 205 sunny days.

Clayton gets some kind of precipitation, on average, 64 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 88 degrees
Winter Low: the January low is 39
Rain: averages 19 inches of rain a year
Snow: averages 0 inches of snow a year

Bestplaces Comfort Index

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

9.3 Summer - 7.3 Winter

June, September and May are the most pleasant months in Clayton, while January and December are the least comfortable months.

Climate	Clayton, California	United States
	19.2 in.	38.1 in.
	0.0 in.	27.8 in.
	64.3 days	106.2 days
	257 days	205 days
	88.1°	85.8°
	39.1°	21.7°
	8.5	7
	5.4	4.3
	394 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.

July is the hottest month for Clayton with an average high temperature of 88.1°, which ranks it as about average compared to other places in California. In Clayton, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Clayton are October, May and June.

In Clayton, there are 44.5 days annually when the high temperature is over 90°, which is about average compared to other places in California.

January has the coldest nighttime temperatures for Clayton with an average of 39.1°. This is warmer than most places in California.

In Clayton, there are 11.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Clayton, 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 is low in Clayton, and some people might find the dryness to be uncomfortable. Days with noticeable humidity are rare throughout the year. A very dry climate can lead to cracked, itchy skin and dry eyes.

February is the wettest month in Clayton with 3.6 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 19.2 inches in Clayton means that it is about average compared to other places in California.

December is the rainiest month in Clayton with 10.9 days of rain, and July is the driest month with only 0.2 rainy days. There are 64.3 rainy days annually in Clayton, which is rainier than most places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 2% chance of a rainy day.

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