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Monthly climate in Alta, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Alta features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 4 °C (39 °F) and 23 °C (74 °F) through the year, but rarely can drop to -11 °C (12 °F) or can rise to as high as 37 °C (100 °F).The average annual precipitation amounts to about 1617 mm (63.6 inches) and receives 87 rainy days on the 1 mm (0.04 inches) threshold annually.Alta enjoys an average of 3441 hours of sunshine throughout the year, and daylight varies from 9 hours 26 minutes to 14 hours 52 minutes per day.

Monthly average temperatures in Alta, California, United States §

The warmest months in Alta are June, July and August, with daily mean temperatures ranging from 19 to 23 °C (66 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 4 °C (39 - 40 °F) throughout the day. On average each year, Alta experiences 89 days above 25 °C (77.0 °F) and 68 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Alta, 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 19°C
(67°F)		 21°C
(70°F)		 23°C
(73°F)		 27°C
(81°F)		 30°C
(87°F)		 36°C
(97°F)		 37°C
(100°F)		 36°C
(98°F)		 37°C
(100°F)		 32°C
(89°F)		 25°C
(77°F)		 21°C
(71°F)
Mean maximum 16°C
(61°F)		 18°C
(64°F)		 20°C
(68°F)		 25°C
(77°F)		 28°C
(83°F)		 32°C
(90°F)		 35°C
(95°F)		 35°C
(95°F)		 34°C
(93°F)		 27°C
(81°F)		 22°C
(73°F)		 17°C
(63°F)
Average high 9°C
(48°F)		 10°C
(50°F)		 11°C
(52°F)		 15°C
(60°F)		 19°C
(67°F)		 25°C
(78°F)		 30°C
(87°F)		 30°C
(86°F)		 26°C
(79°F)		 20°C
(69°F)		 14°C
(58°F)		 9°C
(48°F)
Daily mean 4°C
(39°F)		 4°C
(40°F)		 5°C
(42°F)		 9°C
(49°F)		 13°C
(56°F)		 19°C
(66°F)		 23°C
(74°F)		 22°C
(72°F)		 18°C
(65°F)		 12°C
(55°F)		 8°C
(46°F)		 4°C
(39°F)
Average low 0°C
(33°F)		 -0°C
(31°F)		 1°C
(33°F)		 3°C
(38°F)		 7°C
(44°F)		 11°C
(53°F)		 15°C
(59°F)		 14°C
(58°F)		 11°C
(53°F)		 6°C
(43°F)		 3°C
(37°F)		 -0°C
(32°F)
Mean minimum -6°C
(21°F)		 -8°C
(18°F)		 -6°C
(21°F)		 -5°C
(24°F)		 0°C
(32°F)		 4°C
(40°F)		 11°C
(52°F)		 10°C
(50°F)		 5°C
(41°F)		 0°C
(33°F)		 -3°C
(27°F)		 -6°C
(22°F)
Minimum -10°C
(14°F)		 -11°C
(12°F)		 -8°C
(17°F)		 -8°C
(18°F)		 -4°C
(26°F)		 1°C
(35°F)		 8°C
(47°F)		 9°C
(48°F)		 1°C
(35°F)		 -1°C
(30°F)		 -6°C
(21°F)		 -7°C
(20°F)

Compare climate in Alta with other places

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

Monthly average precipitation in Alta, California, United States §

Alta usually has the most precipitation in January, February and March, with an average of 12 rainy days and 289 mm (11.4 inches) of precipitation per month.The driest months in Alta are June, July and August. On average, 10 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Alta, 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) 289 (11.4) 295 (11.6) 284 (11.2) 140 (5.5) 90 (3.5) 20 (0.8) 3 (0.1) 6 (0.2) 25 (1.0) 77 (3.0) 163 (6.4) 225 (8.8)
Average precipitation days (≥ 1 mm) 12 10 15 9 9 4 0 2 3 3 8 12

Monthly sunshine hours in Alta, California, United States §

The sunniest months in Alta are June, July and August, when the sun shines an average of 12 hours 31 minutes a day.Least sunny months in Alta: January, February and December receive an average of 5 hours 57 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Alta, 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 146 205 254 302 359 389 398 365 320 286 221 190
Mean daily daylight hours 9h 45m 10h 44m 11h 59m 13h 15m 14h 20m 14h 52m 14h 34m 13h 36m 12h 23m 11h 6m 10h 0m 9h 26m

Solar UV radiation in Alta, California, United States §

Alta experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 12, 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 Alta UV Index data.

Average daily maximum UV levels by month for Alta, 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 8 9 11 12 11 10 9 7 4 3