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Monthly climate in Casper, Wyoming, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Casper features a cold semi-arid climate (BSk).Temperatures typically range between -7 °C (19 °F) and 22 °C (72 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 421 mm (16.6 inches) and receives 87 rainy days on the 1 mm (0.04 inches) threshold annually.Casper enjoys an average of 3437 hours of sunshine throughout the year, and daylight varies from 9 hours 3 minutes to 15 hours 16 minutes per day.

Monthly average temperatures in Casper, Wyoming, United States §

The warmest months in Casper are June, July and August, with daily mean temperatures ranging from 18 to 22 °C (65 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -7 to -5 °C (19 - 24 °F) throughout the day. On average each year, Casper experiences 71 days above 25 °C (77.0 °F) and 167 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Casper, Wyoming, 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 7°C
(45°F)		 10°C
(51°F)		 19°C
(67°F)		 22°C
(73°F)		 28°C
(83°F)		 37°C
(99°F)		 37°C
(98°F)		 36°C
(96°F)		 35°C
(96°F)		 26°C
(78°F)		 19°C
(67°F)		 16°C
(60°F)
Mean maximum 5°C
(41°F)		 6°C
(43°F)		 14°C
(57°F)		 21°C
(70°F)		 26°C
(78°F)		 29°C
(84°F)		 36°C
(96°F)		 34°C
(93°F)		 33°C
(92°F)		 23°C
(74°F)		 15°C
(60°F)		 9°C
(49°F)
Average high -2°C
(29°F)		 -2°C
(28°F)		 5°C
(41°F)		 10°C
(50°F)		 16°C
(61°F)		 25°C
(78°F)		 30°C
(86°F)		 28°C
(83°F)		 23°C
(74°F)		 11°C
(52°F)		 6°C
(44°F)		 -0°C
(32°F)
Daily mean -6°C
(21°F)		 -7°C
(19°F)		 -1°C
(31°F)		 3°C
(38°F)		 10°C
(50°F)		 18°C
(65°F)		 22°C
(72°F)		 21°C
(69°F)		 16°C
(60°F)		 5°C
(41°F)		 1°C
(34°F)		 -5°C
(24°F)
Average low -11°C
(13°F)		 -13°C
(9°F)		 -6°C
(22°F)		 -3°C
(27°F)		 3°C
(39°F)		 10°C
(50°F)		 14°C
(57°F)		 12°C
(54°F)		 8°C
(47°F)		 -1°C
(30°F)		 -4°C
(25°F)		 -9°C
(15°F)
Mean minimum -24°C
(-11°F)		 -26°C
(-15°F)		 -19°C
(-1°F)		 -16°C
(4°F)		 -5°C
(24°F)		 3°C
(38°F)		 7°C
(46°F)		 7°C
(44°F)		 -1°C
(30°F)		 -18°C
(-1°F)		 -15°C
(6°F)		 -21°C
(-6°F)
Minimum -27°C
(-17°F)		 -29°C
(-21°F)		 -30°C
(-22°F)		 -23°C
(-8°F)		 -13°C
(9°F)		 1°C
(34°F)		 6°C
(43°F)		 5°C
(42°F)		 -9°C
(16°F)		 -29°C
(-20°F)		 -25°C
(-13°F)		 -23°C
(-9°F)

Compare climate in Casper with other places

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

Monthly average precipitation in Casper, Wyoming, United States §

Casper usually has the most precipitation in March, April and May, with an average of 11 rainy days and 59 mm (2.3 inches) of precipitation per month.The driest months in Casper are January, July and August. On average, 19 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Casper, Wyoming, 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) 23 (0.9) 31 (1.2) 48 (1.9) 59 (2.3) 70 (2.7) 30 (1.2) 17 (0.7) 19 (0.7) 29 (1.2) 43 (1.7) 26 (1.0) 27 (1.1)
Average precipitation days (≥ 1 mm) 5 8 8 13 12 5 5 3 6 8 7 7

Monthly sunshine hours in Casper, Wyoming, United States §

The sunniest months in Casper are June, July and August, when the sun shines an average of 12 hours 15 minutes a day.Least sunny months in Casper: January, February and December receive an average of 6 hours 49 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Casper, Wyoming, 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 177 221 277 292 322 380 390 356 300 254 239 222
Mean daily daylight hours 9h 25m 10h 32m 11h 58m 13h 25m 14h 39m 15h 16m 14h 56m 13h 49m 12h 25m 10h 59m 9h 42m 9h 3m

Solar UV radiation in Casper, Wyoming, United States §

Casper experiences the highest level of ultraviolet (UV) radiation in April, 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 Casper UV Index data.

Average daily maximum UV levels by month for Casper, Wyoming, 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 7 11 10 12 12 11 9 6 4 3