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Monthly climate in Thermopolis, Wyoming, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Thermopolis features a cold desert climate (BWk).Temperatures typically range between -6 °C (21 °F) and 24 °C (76 °F) through the year, but rarely can drop to -29 °C (-20 °F) or can rise to as high as 40 °C (104 °F).The average annual precipitation amounts to about 317 mm (12.5 inches) and receives 60 rainy days on the 1 mm (0.04 inches) threshold annually.Thermopolis enjoys an average of 3421 hours of sunshine throughout the year, and daylight varies from 8 hours 58 minutes to 15 hours 22 minutes per day.

Monthly average temperatures in Thermopolis, Wyoming, United States §

The warmest months in Thermopolis are June, July and August, with daily mean temperatures ranging from 20 to 24 °C (68 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -4 °C (21 - 24 °F) throughout the day. On average each year, Thermopolis experiences 83 days above 25 °C (77.0 °F) and 153 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Thermopolis, 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 11°C
(52°F)		 14°C
(57°F)		 24°C
(76°F)		 27°C
(80°F)		 31°C
(88°F)		 39°C
(103°F)		 40°C
(104°F)		 38°C
(100°F)		 37°C
(100°F)		 28°C
(83°F)		 21°C
(70°F)		 18°C
(65°F)
Mean maximum 8°C
(46°F)		 12°C
(53°F)		 20°C
(68°F)		 25°C
(78°F)		 29°C
(84°F)		 32°C
(89°F)		 38°C
(100°F)		 36°C
(97°F)		 35°C
(95°F)		 25°C
(77°F)		 17°C
(62°F)		 11°C
(52°F)
Average high -0°C
(32°F)		 0°C
(33°F)		 10°C
(50°F)		 14°C
(57°F)		 19°C
(66°F)		 27°C
(81°F)		 32°C
(90°F)		 30°C
(86°F)		 24°C
(76°F)		 13°C
(57°F)		 8°C
(46°F)		 2°C
(35°F)
Daily mean -6°C
(21°F)		 -6°C
(21°F)		 3°C
(37°F)		 7°C
(44°F)		 12°C
(54°F)		 20°C
(68°F)		 24°C
(76°F)		 22°C
(72°F)		 17°C
(62°F)		 7°C
(44°F)		 1°C
(35°F)		 -4°C
(24°F)
Average low -12°C
(12°F)		 -12°C
(11°F)		 -3°C
(26°F)		 -0°C
(32°F)		 6°C
(42°F)		 12°C
(53°F)		 16°C
(60°F)		 14°C
(57°F)		 9°C
(48°F)		 0°C
(33°F)		 -4°C
(25°F)		 -10°C
(15°F)
Mean minimum -21°C
(-6°F)		 -23°C
(-9°F)		 -17°C
(1°F)		 -11°C
(13°F)		 -1°C
(30°F)		 5°C
(42°F)		 9°C
(48°F)		 8°C
(47°F)		 0°C
(33°F)		 -13°C
(9°F)		 -13°C
(9°F)		 -20°C
(-4°F)
Minimum -29°C
(-20°F)		 -25°C
(-13°F)		 -27°C
(-16°F)		 -15°C
(5°F)		 -4°C
(25°F)		 1°C
(35°F)		 7°C
(44°F)		 7°C
(44°F)		 -4°C
(24°F)		 -22°C
(-8°F)		 -16°C
(4°F)		 -25°C
(-12°F)

Compare climate in Thermopolis with other places

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

Monthly average precipitation in Thermopolis, Wyoming, United States §

Thermopolis usually has the most precipitation in April, May and June, with an average of 8 rainy days and 49 mm (1.9 inches) of precipitation per month.The driest months in Thermopolis are January, July and December. On average, 13 mm (0.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Thermopolis, 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) 11 (0.4) 21 (0.8) 22 (0.9) 53 (2.1) 67 (2.6) 27 (1.1) 13 (0.5) 18 (0.7) 27 (1.0) 27 (1.1) 17 (0.7) 14 (0.6)
Average precipitation days (≥ 1 mm) 2 6 5 9 10 6 2 3 3 6 4 4

Monthly sunshine hours in Thermopolis, Wyoming, United States §

The sunniest months in Thermopolis are June, July and August, when the sun shines an average of 12 hours 16 minutes a day.Least sunny months in Thermopolis: January, February and December receive an average of 6 hours 38 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Thermopolis, 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 169 218 283 292 324 383 390 355 301 259 226 216
Mean daily daylight hours 9h 20m 10h 30m 11h 58m 13h 27m 14h 44m 15h 22m 15h 1m 13h 52m 12h 26m 10h 57m 9h 38m 8h 58m

Solar UV radiation in Thermopolis, Wyoming, United States §

Thermopolis 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 Thermopolis UV Index data.

Average daily maximum UV levels by month for Thermopolis, 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 6 9 10 11 11 10 9 6 4 3