Climate in California
(United States)

Average daytime and nighttime temperatures

All climatic 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.

Back to overview: United States

California is one of the warmest region in the United States with an average daily high temperature of 23 degrees centigrade.
Overview: Climate in the United States
Daylengths and sun positions in the United States
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in California
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 shortest.
Rainy days per monthRainy days per month in California
A rainy day is a day on which at least an amount of 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 rainy days, December offers the most number of rainy days, and in July the least.
Precipitation in mm/dayPrecipitation in California
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 0.0 mm, the least rain falls in August. December, on the other hand, has the most rain.
Water temperatureWater temperatures in California
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 temperatures in California are in August, when the water is 19 °C.
Relative humidity in %Relative humidity in California
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture of the physically possible is actually contained in the air. At high humidity, the person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% gives as 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/m³Absolute humidity in California
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.
Humidex in °CHumidex in California
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.
International tourismThe 41 most popular travel countriesA ranking of international tourism over 41 countries. USA ranks 3rd.
Infected and deaths by the corona virus (COVID 19)Spread of the Corona virus Covid19 (SARS-CoV-2)Worldwide development of the number of cases and deaths due to the corona virus.
Sweden: Population growthPopulation growth in SwedenPopulation growth of the last 61 years in Sweden compared to the global average