Port Costa, CA Climate

Port Costa, CA has a mild Mediterranean climate with warm and dry summers and cool, wet winters. Temperatures range from an average high of 78°F (26°C) in the summer months to an average low of 45°F (7°C) during the winter months. The climate in Port Costa is generally sunny throughout the year; however, the rainy season can be quite persistent, particularly during December and January. Summer days are often breezy and comfortable due to gentle onshore winds that originate near the Pacific Ocean. Winter days are usually foggy due to the dense marine layer that blankets the area.

Port Costa, California gets 18 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Port Costa 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 Port Costa. The US average is 205 sunny days.

Port Costa gets some kind of precipitation, on average, 61 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 18 inches of rain a year
Snow: averages 0 inches of snow a year

Bestplaces Comfort Index

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

9.2 Summer - 7.2 Winter

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

Climate	Port Costa, California	United States
	Unlock	38.1 in.
	0.0 in.	Unlock
	Unlock	106.2 days
	260 days	Unlock
	87.9°	85.8°
	Unlock	21.7°
	8.5	Unlock
	Unlock	4.3
	16 ft.	Unlock

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 Port Costa with an average high temperature of 87.9°, which ranks it as about average compared to other places in California. In Port Costa, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Port Costa are May, October and June.

In Port Costa, there are 42.0 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 Port Costa with an average of 38.7°. This is warmer than most places in California.

In Port Costa, there are 12.2 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in California.

In Port Costa, 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 Port Costa 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 Port Costa with 3.7 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 18.3 inches in Port Costa means that it is about average compared to other places in California.

December is the rainiest month in Port Costa with 11.0 days of rain, and July is the driest month with only 0.1 rainy days. There are 61.4 rainy days annually in Port Costa, which is rainier than most places in California. The rainiest season is Spring when it rains 53% of the time and the driest is Autumn with only a 1% chance of a rainy day.

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

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