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Monthly climate in Riverton, Wyoming, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Riverton features a cold semi-arid climate (BSk).Temperatures typically range between -6 °C (22 °F) and 23 °C (73 °F) through the year, but rarely can drop to -29 °C (-19 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 384 mm (15.1 inches) and receives 67 rainy days on the 1 mm (0.04 inches) threshold annually.Riverton enjoys an average of 3424 hours of sunshine throughout the year, and daylight varies from 9 hours 3 minutes to 15 hours 17 minutes per day.

Monthly average temperatures in Riverton, Wyoming, United States §

The warmest months in Riverton are June, July and August, with daily mean temperatures ranging from 18 to 23 °C (65 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -4 °C (22 - 24 °F) throughout the day. On average each year, Riverton experiences 78 days above 25 °C (77.0 °F) and 159 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Riverton, 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 10°C
(49°F)		 15°C
(59°F)		 23°C
(73°F)		 25°C
(77°F)		 31°C
(87°F)		 37°C
(98°F)		 38°C
(101°F)		 35°C
(96°F)		 35°C
(96°F)		 27°C
(81°F)		 20°C
(68°F)		 17°C
(63°F)
Mean maximum 7°C
(45°F)		 11°C
(52°F)		 18°C
(65°F)		 23°C
(74°F)		 27°C
(81°F)		 30°C
(86°F)		 36°C
(96°F)		 34°C
(94°F)		 34°C
(93°F)		 24°C
(75°F)		 16°C
(62°F)		 10°C
(51°F)
Average high 0°C
(32°F)		 1°C
(35°F)		 9°C
(48°F)		 12°C
(54°F)		 18°C
(64°F)		 26°C
(79°F)		 31°C
(88°F)		 29°C
(85°F)		 24°C
(76°F)		 13°C
(56°F)		 8°C
(46°F)		 1°C
(34°F)
Daily mean -6°C
(22°F)		 -5°C
(23°F)		 2°C
(36°F)		 5°C
(42°F)		 11°C
(52°F)		 18°C
(65°F)		 23°C
(73°F)		 21°C
(70°F)		 16°C
(61°F)		 6°C
(43°F)		 1°C
(35°F)		 -4°C
(24°F)
Average low -11°C
(12°F)		 -11°C
(13°F)		 -4°C
(25°F)		 -1°C
(30°F)		 4°C
(40°F)		 10°C
(51°F)		 14°C
(58°F)		 13°C
(55°F)		 8°C
(47°F)		 -0°C
(32°F)		 -4°C
(25°F)		 -9°C
(16°F)
Mean minimum -22°C
(-8°F)		 -23°C
(-9°F)		 -16°C
(4°F)		 -11°C
(12°F)		 -3°C
(26°F)		 4°C
(39°F)		 8°C
(47°F)		 8°C
(46°F)		 0°C
(32°F)		 -14°C
(7°F)		 -11°C
(12°F)		 -19°C
(-3°F)
Minimum -29°C
(-19°F)		 -25°C
(-13°F)		 -25°C
(-13°F)		 -18°C
(-0°F)		 -9°C
(16°F)		 -0°C
(32°F)		 5°C
(41°F)		 6°C
(44°F)		 -5°C
(23°F)		 -24°C
(-11°F)		 -18°C
(0°F)		 -23°C
(-8°F)

Compare climate in Riverton with other places

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

Monthly average precipitation in Riverton, Wyoming, United States §

Riverton usually has the most precipitation in March, April and May, with an average of 8 rainy days and 60 mm (2.4 inches) of precipitation per month.The driest months in Riverton are January, November and December. On average, 16 mm (0.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Riverton, 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) 15 (0.6) 23 (0.9) 38 (1.5) 61 (2.4) 80 (3.2) 30 (1.2) 21 (0.8) 23 (0.9) 27 (1.1) 31 (1.2) 17 (0.7) 16 (0.6)
Average precipitation days (≥ 1 mm) 3 5 6 9 11 5 6 5 4 5 4 4

Monthly sunshine hours in Riverton, Wyoming, United States §

The sunniest months in Riverton are June, July and August, when the sun shines an average of 12 hours 18 minutes a day.Least sunny months in Riverton: January, February and December receive an average of 6 hours 39 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Riverton, 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 169 221 281 292 321 384 390 356 301 261 228 215
Mean daily daylight hours 9h 24m 10h 32m 11h 58m 13h 25m 14h 40m 15h 17m 14h 56m 13h 50m 12h 25m 10h 58m 9h 42m 9h 3m

Solar UV radiation in Riverton, Wyoming, United States §

Riverton experiences the highest level of ultraviolet (UV) radiation in June, July 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, 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 Riverton UV Index data.

Average daily maximum UV levels by month for Riverton, 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) 3 5 7 9 10 11 11 10 9 6 4 3