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Monthly climate in Green River, Wyoming, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Green River features a cold semi-arid climate (BSk).Temperatures typically range between -7 °C (19 °F) and 23 °C (74 °F) through the year, but rarely can drop to -27 °C (-16 °F) or can rise to as high as 37 °C (98 °F).The average annual precipitation amounts to about 289 mm (11.4 inches) and receives 63 rainy days on the 1 mm (0.04 inches) threshold annually.Green River enjoys an average of 3485 hours of sunshine throughout the year, and daylight varies from 9 hours 12 minutes to 15 hours 7 minutes per day.

Monthly average temperatures in Green River, Wyoming, United States §

The warmest months in Green River 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 -7 to -6 °C (19 - 22 °F) throughout the day. On average each year, Green River experiences 80 days above 25 °C (77.0 °F) and 158 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Green River, 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 8°C
(47°F)		 9°C
(49°F)		 20°C
(69°F)		 24°C
(76°F)		 29°C
(85°F)		 35°C
(96°F)		 37°C
(98°F)		 35°C
(96°F)		 33°C
(93°F)		 25°C
(76°F)		 20°C
(68°F)		 14°C
(58°F)
Mean maximum 4°C
(40°F)		 6°C
(44°F)		 14°C
(57°F)		 22°C
(72°F)		 26°C
(80°F)		 29°C
(85°F)		 34°C
(94°F)		 34°C
(93°F)		 32°C
(90°F)		 23°C
(73°F)		 16°C
(61°F)		 8°C
(46°F)
Average high -3°C
(27°F)		 -1°C
(31°F)		 5°C
(42°F)		 12°C
(53°F)		 18°C
(65°F)		 26°C
(79°F)		 31°C
(87°F)		 29°C
(85°F)		 24°C
(75°F)		 13°C
(56°F)		 7°C
(45°F)		 -1°C
(31°F)
Daily mean -7°C
(19°F)		 -6°C
(22°F)		 -0°C
(32°F)		 5°C
(42°F)		 11°C
(53°F)		 19°C
(66°F)		 23°C
(74°F)		 22°C
(72°F)		 16°C
(62°F)		 7°C
(44°F)		 1°C
(34°F)		 -6°C
(22°F)
Average low -12°C
(11°F)		 -11°C
(13°F)		 -6°C
(22°F)		 -1°C
(31°F)		 5°C
(41°F)		 11°C
(52°F)		 16°C
(60°F)		 14°C
(58°F)		 9°C
(48°F)		 1°C
(33°F)		 -4°C
(25°F)		 -11°C
(13°F)
Mean minimum -23°C
(-9°F)		 -22°C
(-8°F)		 -17°C
(2°F)		 -9°C
(17°F)		 -3°C
(28°F)		 3°C
(37°F)		 9°C
(48°F)		 9°C
(48°F)		 0°C
(33°F)		 -11°C
(12°F)		 -15°C
(6°F)		 -19°C
(-2°F)
Minimum -27°C
(-16°F)		 -26°C
(-15°F)		 -23°C
(-9°F)		 -11°C
(13°F)		 -4°C
(25°F)		 -0°C
(32°F)		 6°C
(43°F)		 7°C
(45°F)		 -2°C
(29°F)		 -21°C
(-6°F)		 -18°C
(-1°F)		 -22°C
(-7°F)

Compare climate in Green River with other places

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

Monthly average precipitation in Green River, Wyoming, United States §

Green River usually has the most precipitation in March, April and May, with an average of 9 rainy days and 41 mm (1.6 inches) of precipitation per month.The driest months in Green River are June, July and August. On average, 11 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Green River, 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) 24 (0.9) 24 (1.0) 41 (1.6) 38 (1.5) 44 (1.7) 15 (0.6) 7 (0.3) 11 (0.4) 19 (0.7) 21 (0.8) 23 (0.9) 22 (0.9)
Average precipitation days (≥ 1 mm) 5 5 8 9 10 2 2 2 3 5 5 7

Monthly sunshine hours in Green River, Wyoming, United States §

The sunniest months in Green River are June, July and August, when the sun shines an average of 12 hours 16 minutes a day.Least sunny months in Green River: January, February and December receive an average of 6 hours 42 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Green River, 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 168 222 278 305 346 382 389 357 310 271 232 219
Mean daily daylight hours 9h 32m 10h 37m 11h 58m 13h 21m 14h 32m 15h 7m 14h 48m 13h 45m 12h 24m 11h 1m 9h 49m 9h 12m

Solar UV radiation in Green River, Wyoming, United States §

Green River 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 4. For more detailed information, check out our hourly Green River UV Index data.

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