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Monthly climate in Shasta Lake, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Shasta Lake features a hot-summer Mediterranean climate (Csa).Temperatures typically range between 7 °C (45 °F) and 29 °C (84 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 43 °C (110 °F).The average annual precipitation amounts to about 1318 mm (51.9 inches) and receives 77 rainy days on the 1 mm (0.04 inches) threshold annually.Shasta Lake enjoys an average of 3252 hours of sunshine throughout the year, and daylight varies from 9 hours 17 minutes to 15 hours 1 minutes per day.

Monthly average temperatures in Shasta Lake, California, United States §

The warmest months in Shasta Lake are June, July and August, with daily mean temperatures ranging from 25 to 29 °C (76 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 8 °C (45 - 47 °F) throughout the day. On average each year, Shasta Lake experiences 138 days above 25 °C (77.0 °F) and 11 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Shasta Lake, 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 21°C
(69°F)		 27°C
(80°F)		 27°C
(81°F)		 32°C
(90°F)		 37°C
(100°F)		 42°C
(108°F)		 43°C
(110°F)		 43°C
(110°F)		 42°C
(108°F)		 38°C
(101°F)		 28°C
(83°F)		 22°C
(72°F)
Mean maximum 19°C
(66°F)		 22°C
(73°F)		 25°C
(77°F)		 30°C
(86°F)		 35°C
(95°F)		 39°C
(102°F)		 42°C
(107°F)		 41°C
(106°F)		 39°C
(102°F)		 32°C
(90°F)		 26°C
(78°F)		 18°C
(65°F)
Average high 12°C
(54°F)		 15°C
(59°F)		 16°C
(61°F)		 21°C
(70°F)		 26°C
(79°F)		 32°C
(90°F)		 36°C
(98°F)		 35°C
(96°F)		 31°C
(88°F)		 24°C
(76°F)		 17°C
(63°F)		 12°C
(54°F)
Daily mean 7°C
(45°F)		 8°C
(47°F)		 10°C
(50°F)		 14°C
(58°F)		 19°C
(66°F)		 25°C
(76°F)		 29°C
(84°F)		 27°C
(81°F)		 23°C
(73°F)		 16°C
(62°F)		 11°C
(52°F)		 7°C
(45°F)
Average low 4°C
(39°F)		 3°C
(38°F)		 5°C
(41°F)		 8°C
(46°F)		 12°C
(53°F)		 17°C
(62°F)		 20°C
(68°F)		 19°C
(66°F)		 15°C
(59°F)		 10°C
(50°F)		 6°C
(43°F)		 3°C
(38°F)
Mean minimum -2°C
(29°F)		 -2°C
(28°F)		 -0°C
(31°F)		 2°C
(35°F)		 5°C
(42°F)		 9°C
(49°F)		 16°C
(61°F)		 15°C
(59°F)		 9°C
(48°F)		 5°C
(41°F)		 0°C
(33°F)		 -1°C
(30°F)
Minimum -5°C
(24°F)		 -4°C
(25°F)		 -2°C
(29°F)		 0°C
(33°F)		 2°C
(36°F)		 7°C
(45°F)		 14°C
(58°F)		 13°C
(56°F)		 6°C
(43°F)		 4°C
(39°F)		 -2°C
(30°F)		 -4°C
(26°F)

Compare climate in Shasta Lake with other places

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

Monthly average precipitation in Shasta Lake, California, United States §

Shasta Lake usually has the most precipitation in January, February and March, with an average of 12 rainy days and 234 mm (9.2 inches) of precipitation per month.The driest months in Shasta Lake are June, July and August. On average, 4 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Shasta Lake, 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) 257 (10.1) 229 (9.0) 217 (8.6) 116 (4.6) 68 (2.7) 10 (0.4) 0 (0.0) 1 (0.1) 11 (0.4) 79 (3.1) 152 (6.0) 177 (7.0)
Average precipitation days (≥ 1 mm) 13 10 14 9 5 1 0 0 1 4 8 12

Monthly sunshine hours in Shasta Lake, California, United States §

The sunniest months in Shasta Lake are May, June and July, when the sun shines an average of 12 hours 24 minutes a day.Least sunny months in Shasta Lake: January, February and December receive an average of 5 hours 4 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Shasta Lake, 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 113 186 228 284 352 387 400 351 309 275 199 162
Mean daily daylight hours 9h 37m 10h 39m 11h 58m 13h 19m 14h 28m 15h 1m 14h 43m 13h 41m 12h 24m 11h 3m 9h 53m 9h 17m

Solar UV radiation in Shasta Lake, California, United States §

Shasta Lake experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, February 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 Shasta Lake UV Index data.

Average daily maximum UV levels by month for Shasta Lake, 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 4 7 8 11 11 10 10 9 6 4 3