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Monthly climate in Clearlake, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Clearlake features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 7 °C (46 °F) and 25 °C (78 °F) through the year, but rarely can drop to -3 °C (26 °F) or can rise to as high as 40 °C (105 °F).The average annual precipitation amounts to about 694 mm (27.3 inches) and receives 57 rainy days on the 1 mm (0.04 inches) threshold annually.Clearlake enjoys an average of 3382 hours of sunshine throughout the year, and daylight varies from 9 hours 27 minutes to 14 hours 50 minutes per day.

Monthly average temperatures in Clearlake, California, United States §

The warmest months in Clearlake are June, July and August, with daily mean temperatures ranging from 22 to 25 °C (71 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 8 °C (46 - 48 °F) throughout the day. On average each year, Clearlake experiences 114 days above 25 °C (77.0 °F) and 7 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Clearlake, California, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 24°C
(75°F)		 25°C
(78°F)		 27°C
(81°F)		 32°C
(90°F)		 33°C
(92°F)		 39°C
(103°F)		 38°C
(101°F)		 38°C
(100°F)		 40°C
(105°F)		 35°C
(96°F)		 27°C
(81°F)		 23°C
(74°F)
Mean maximum 20°C
(67°F)		 21°C
(71°F)		 24°C
(76°F)		 28°C
(82°F)		 30°C
(87°F)		 34°C
(94°F)		 36°C
(98°F)		 37°C
(98°F)		 36°C
(98°F)		 31°C
(88°F)		 24°C
(76°F)		 19°C
(67°F)
Average high 12°C
(54°F)		 14°C
(57°F)		 15°C
(59°F)		 19°C
(66°F)		 23°C
(73°F)		 28°C
(83°F)		 32°C
(90°F)		 32°C
(89°F)		 28°C
(84°F)		 23°C
(74°F)		 17°C
(63°F)		 12°C
(54°F)
Daily mean 7°C
(46°F)		 8°C
(48°F)		 9°C
(49°F)		 13°C
(56°F)		 16°C
(62°F)		 22°C
(71°F)		 25°C
(78°F)		 25°C
(77°F)		 21°C
(71°F)		 16°C
(62°F)		 11°C
(52°F)		 8°C
(46°F)
Average low 4°C
(40°F)		 4°C
(40°F)		 5°C
(41°F)		 8°C
(46°F)		 11°C
(52°F)		 16°C
(60°F)		 19°C
(66°F)		 19°C
(66°F)		 16°C
(60°F)		 11°C
(51°F)		 7°C
(44°F)		 4°C
(39°F)
Mean minimum -2°C
(30°F)		 -2°C
(29°F)		 -0°C
(32°F)		 2°C
(35°F)		 5°C
(41°F)		 9°C
(48°F)		 15°C
(60°F)		 15°C
(60°F)		 9°C
(49°F)		 6°C
(43°F)		 2°C
(35°F)		 -0°C
(32°F)
Minimum -3°C
(26°F)		 -3°C
(26°F)		 -2°C
(29°F)		 -0°C
(32°F)		 1°C
(33°F)		 7°C
(45°F)		 14°C
(58°F)		 14°C
(57°F)		 6°C
(42°F)		 4°C
(40°F)		 -1°C
(31°F)		 -3°C
(28°F)

Compare climate in Clearlake with other places

Compare temperature, precipitation, sunshine, UV index in Clearlake, California, United States with other places around the world.

Monthly average precipitation in Clearlake, California, United States §

Clearlake usually has the most precipitation in January, February and March, with an average of 9 rainy days and 135 mm (5.3 inches) of precipitation per month.The driest months in Clearlake are June, July and August. On average, 2 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Clearlake, California, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 144 (5.7) 157 (6.2) 104 (4.1) 50 (2.0) 38 (1.5) 3 (0.1) 0 (0.0) 1 (0.0) 4 (0.1) 42 (1.6) 57 (2.3) 94 (3.7)
Average precipitation days (≥ 1 mm) 9 9 11 6 4 1 0 0 1 2 6 8

Monthly sunshine hours in Clearlake, California, United States §

The sunniest months in Clearlake are May, June and July, when the sun shines an average of 12 hours 27 minutes a day.Least sunny months in Clearlake: January, February and December receive an average of 5 hours 42 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Clearlake, California, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 138 204 254 296 361 386 398 355 314 280 215 177
Mean daily daylight hours 9h 46m 10h 44m 11h 59m 13h 15m 14h 19m 14h 50m 14h 33m 13h 36m 12h 23m 11h 7m 10h 1m 9h 27m

Solar UV radiation in Clearlake, California, United States §

Clearlake experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Clearlake UV Index data.

Average daily maximum UV levels by month for Clearlake, California, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 7 9 11 11 11 11 9 7 4 3