Climate in California
(United States)

Average daytime and nighttime temperatures

All climate diagrams on this site result from the collected data from 17 measuring weather stations in California.
Weather stations at an altitude above 660m have not been included.
All data correspond to the average monthly values of the last 20 years.

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California is one of the warmest regions in the United States of America with an average daily high temperature of 23 degrees.
Overview: Climate in the United States of America
Daylengths and sun positions in the United States of America
Compare climate with other regions or countries
Sunshine hours per day
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 12 hours per day, May is the sunniest month in the state of California. In December, the sun shines the least.
Rain days per month
A rain day is a day on which at least 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 7 rain days, December offers the most rain days, while July has the fewest.
Precipitation amount in mm/day
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.1 mm, the least amount of rain falls in August. December, on the other hand, has the most rain.
Water temperatures in °C
Water temperature depends not only on solar radiation within the same region, but also on ocean currents. For example, depending on the season, cold or warm water masses are moved from other areas. The warmest water temperatures in California are in August, when the water is 19 °C.
Relative humidity in %
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture can be physically contained in the air. At high humidity, a person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% feels pleasant. With humidity averaging 71%, January is the most uncomfortable. In June, on the other hand, it is easier to endure.
Absolute humidity in g/m³
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy. This limit is only reached in a few months in California, although these are always average values.
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity, the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Map of California

Most important cities in the federal state »California«

Alone 6 major cities with over 500,000 inhabitants are located here. The federal state has a west-east extension of about 850 km and over 1020 km from north to south.

CityPopulationGeo position
Los Angeles4,057,84134° 3' 8"N118° 14' 37"W
San Diego1,453,77532° 42' 55"N117° 9' 26"W
San Jose1,033,51937° 20' 22"N121° 53' 42"W
San Francisco906,41937° 46' 30"N122° 25' 10"W
Fresno530,09336° 44' 52"N119° 46' 21"W
Sacramento508,52938° 34' 54"N121° 29' 40"W
Long Beach467,35433° 46' 1"N118° 11' 21"W
Oakland429,08237° 48' 16"N122° 16' 15"W
Bakersfield383,57935° 22' 24"N119° 1' 7"W
Anaheim352,00533° 50' 7"N117° 54' 52"W
Santa Ana332,72533° 44' 44"N117° 52' 4"W
Riverside330,06333° 57' 12"N117° 23' 46"W
Stockton311,17837° 57' 28"N121° 17' 27"W
Chula Vista271,65132° 38' 24"N117° 5' 3"W
Irvine266,12233° 40' 10"N117° 49' 23"W
Fremont233,13637° 32' 54"N121° 59' 19"W
San Bernardino216,23934° 6' 30"N117° 17' 23"W
Modesto212,17537° 38' 21"N120° 59' 49"W
Fontana209,66534° 5' 32"N117° 26' 6"W
Oxnard207,90634° 11' 51"N119° 10' 37"W
Moreno Valley205,49933° 56' 15"N117° 13' 50"W
North Glendale203,20134° 9' 38"N118° 15' 52"W
Glendale200,83134° 8' 33"N118° 15' 18"W
Huntington Beach200,65233° 39' 37"N117° 59' 57"W
Oxnard Shores187,23534° 11' 27"N119° 14' 29"W
Santa Clarita181,97234° 23' 30"N118° 32' 33"W
Rancho Cucamonga176,53434° 6' 23"N117° 35' 35"W
Oceanside175,46433° 11' 45"N117° 22' 46"W
Santa Rosa175,15538° 26' 26"N122° 42' 52"W
Garden Grove174,85833° 46' 26"N117° 56' 29"W

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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