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Monthly climate in Fort Irwin, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Fort Irwin features a cold desert climate (BWk).Temperatures typically range between 8 °C (46 °F) and 32 °C (89 °F) through the year, but rarely can drop to -4 °C (24 °F) or can rise to as high as 44 °C (112 °F).The average annual precipitation amounts to about 102 mm (4.0 inches) and receives 13 rainy days on the 1 mm (0.04 inches) threshold annually.Fort Irwin enjoys an average of 3684 hours of sunshine throughout the year, and daylight varies from 9 hours 48 minutes to 14 hours 28 minutes per day.

Monthly average temperatures in Fort Irwin, California, United States §

The warmest months in Fort Irwin are June, July and August, with daily mean temperatures ranging from 28 to 32 °C (83 - 89 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 8 to 10 °C (46 - 51 °F) throughout the day. On average each year, Fort Irwin experiences 160 days above 25 °C (77.0 °F) and 12 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Fort Irwin, 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 22°C
(71°F)		 24°C
(76°F)		 30°C
(87°F)		 35°C
(95°F)		 39°C
(103°F)		 44°C
(111°F)		 44°C
(112°F)		 43°C
(110°F)		 43°C
(110°F)		 36°C
(98°F)		 29°C
(84°F)		 23°C
(73°F)
Mean maximum 20°C
(68°F)		 23°C
(73°F)		 27°C
(81°F)		 32°C
(90°F)		 36°C
(96°F)		 39°C
(102°F)		 42°C
(109°F)		 41°C
(107°F)		 40°C
(105°F)		 32°C
(90°F)		 26°C
(80°F)		 20°C
(69°F)
Average high 14°C
(58°F)		 16°C
(61°F)		 20°C
(67°F)		 25°C
(77°F)		 29°C
(84°F)		 35°C
(95°F)		 38°C
(101°F)		 38°C
(100°F)		 33°C
(92°F)		 26°C
(79°F)		 20°C
(68°F)		 14°C
(57°F)
Daily mean 9°C
(48°F)		 10°C
(51°F)		 13°C
(57°F)		 18°C
(65°F)		 22°C
(72°F)		 28°C
(83°F)		 32°C
(89°F)		 31°C
(88°F)		 27°C
(80°F)		 19°C
(67°F)		 13°C
(56°F)		 8°C
(46°F)
Average low 3°C
(38°F)		 5°C
(41°F)		 8°C
(46°F)		 12°C
(54°F)		 15°C
(59°F)		 21°C
(70°F)		 25°C
(77°F)		 24°C
(75°F)		 19°C
(67°F)		 12°C
(54°F)		 7°C
(45°F)		 3°C
(37°F)
Mean minimum -2°C
(29°F)		 -2°C
(28°F)		 0°C
(33°F)		 5°C
(41°F)		 7°C
(46°F)		 13°C
(56°F)		 20°C
(68°F)		 18°C
(65°F)		 12°C
(54°F)		 5°C
(41°F)		 0°C
(33°F)		 -2°C
(29°F)
Minimum -3°C
(26°F)		 -4°C
(24°F)		 -1°C
(30°F)		 3°C
(38°F)		 5°C
(42°F)		 10°C
(51°F)		 18°C
(65°F)		 16°C
(61°F)		 8°C
(46°F)		 2°C
(35°F)		 -2°C
(29°F)		 -3°C
(27°F)

Compare climate in Fort Irwin with other places

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

Monthly average precipitation in Fort Irwin, California, United States §

Fort Irwin usually has the most precipitation in January, March and December, with an average of 2 rainy days and 19 mm (0.7 inches) of precipitation per month.The driest months in Fort Irwin are June, August and September. On average, 1 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Fort Irwin, 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) 22 (0.9) 15 (0.6) 17 (0.7) 12 (0.5) 4 (0.2) 1 (0.0) 3 (0.1) 1 (0.0) 1 (0.0) 3 (0.1) 6 (0.2) 18 (0.7)
Average precipitation days (≥ 1 mm) 3 2 3 1 1 0 0 0 0 0 1 2

Monthly sunshine hours in Fort Irwin, California, United States §

The sunniest months in Fort Irwin are May, June and July, when the sun shines an average of 12 hours 21 minutes a day.Least sunny months in Fort Irwin: January, February and December receive an average of 7 hours 22 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Fort Irwin, 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 190 247 301 329 371 381 384 363 322 299 259 233
Mean daily daylight hours 10h 4m 10h 54m 11h 59m 13h 6m 14h 1m 14h 28m 14h 13m 13h 24m 12h 20m 11h 14m 10h 17m 9h 48m

Solar UV radiation in Fort Irwin, California, United States §

Fort Irwin experiences the highest level of ultraviolet (UV) radiation in June, July and August, 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 5. For more detailed information, check out our hourly Fort Irwin UV Index data.

Average daily maximum UV levels by month for Fort Irwin, 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) 4 6 9 10 11 12 12 11 10 7 5 4