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Monthly climate in Chinook, Montana, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Chinook features a cold semi-arid climate (BSk).Temperatures typically range between -9 °C (16 °F) and 22 °C (71 °F) through the year, but rarely can drop to -36 °C (-33 °F) or can rise to as high as 39 °C (103 °F).The average annual precipitation amounts to about 368 mm (14.5 inches) and receives 76 rainy days on the 1 mm (0.04 inches) threshold annually.Chinook enjoys an average of 3193 hours of sunshine throughout the year, and daylight varies from 8 hours 20 minutes to 16 hours 3 minutes per day.

Monthly average temperatures in Chinook, Montana, United States §

The warmest months in Chinook are June, July and August, with daily mean temperatures ranging from 18 to 22 °C (64 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -9 to -4 °C (16 - 26 °F) throughout the day. On average each year, Chinook experiences 61 days above 25 °C (77.0 °F) and 146 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Chinook, Montana, 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 12°C
(54°F)		 15°C
(59°F)		 21°C
(70°F)		 26°C
(80°F)		 30°C
(87°F)		 37°C
(99°F)		 38°C
(100°F)		 39°C
(103°F)		 34°C
(93°F)		 30°C
(86°F)		 23°C
(74°F)		 18°C
(65°F)
Mean maximum 10°C
(51°F)		 11°C
(52°F)		 16°C
(61°F)		 23°C
(74°F)		 28°C
(83°F)		 31°C
(87°F)		 36°C
(97°F)		 36°C
(97°F)		 32°C
(90°F)		 26°C
(78°F)		 17°C
(64°F)		 13°C
(57°F)
Average high -1°C
(31°F)		 -4°C
(25°F)		 5°C
(41°F)		 11°C
(52°F)		 18°C
(65°F)		 24°C
(75°F)		 29°C
(85°F)		 28°C
(82°F)		 21°C
(70°F)		 12°C
(54°F)		 6°C
(42°F)		 1°C
(33°F)
Daily mean -5°C
(23°F)		 -9°C
(16°F)		 -0°C
(31°F)		 5°C
(41°F)		 12°C
(54°F)		 18°C
(64°F)		 22°C
(71°F)		 20°C
(69°F)		 14°C
(58°F)		 6°C
(43°F)		 1°C
(33°F)		 -4°C
(26°F)
Average low -9°C
(15°F)		 -14°C
(8°F)		 -5°C
(23°F)		 -1°C
(30°F)		 5°C
(42°F)		 11°C
(52°F)		 14°C
(57°F)		 13°C
(55°F)		 8°C
(47°F)		 1°C
(34°F)		 -4°C
(25°F)		 -8°C
(18°F)
Mean minimum -27°C
(-16°F)		 -28°C
(-18°F)		 -19°C
(-2°F)		 -12°C
(11°F)		 -1°C
(30°F)		 6°C
(42°F)		 8°C
(46°F)		 7°C
(44°F)		 -0°C
(32°F)		 -8°C
(19°F)		 -16°C
(3°F)		 -21°C
(-6°F)
Minimum -32°C
(-26°F)		 -36°C
(-33°F)		 -33°C
(-27°F)		 -21°C
(-6°F)		 -5°C
(24°F)		 4°C
(40°F)		 5°C
(42°F)		 5°C
(41°F)		 -2°C
(28°F)		 -12°C
(11°F)		 -25°C
(-13°F)		 -30°C
(-22°F)

Compare climate in Chinook with other places

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

Monthly average precipitation in Chinook, Montana, United States §

Chinook usually has the most precipitation in May, June and September, with an average of 8 rainy days and 46 mm (1.8 inches) of precipitation per month.The driest months in Chinook are January, July and December. On average, 17 mm (0.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Chinook, Montana, 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) 13 (0.5) 31 (1.2) 23 (0.9) 32 (1.3) 42 (1.7) 52 (2.1) 16 (0.6) 29 (1.2) 45 (1.8) 29 (1.1) 34 (1.3) 22 (0.9)
Average precipitation days (≥ 1 mm) 4 8 6 7 9 9 4 4 6 6 7 6

Monthly sunshine hours in Chinook, Montana, United States §

The sunniest months in Chinook are June, July and August, when the sun shines an average of 12 hours 6 minutes a day.Least sunny months in Chinook: January, November and December receive an average of 5 hours 37 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Chinook, Montana, 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 151 189 264 272 326 362 401 349 272 236 188 177
Mean daily daylight hours 8h 47m 10h 12m 11h 56m 13h 44m 15h 16m 16h 3m 15h 37m 14h 14m 12h 30m 10h 44m 9h 9m 8h 20m

Solar UV radiation in Chinook, Montana, United States §

Chinook experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 9, which corresponds to the Very High category of sun exposure.January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Chinook UV Index data.

Average daily maximum UV levels by month for Chinook, Montana, 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) 2 3 5 7 8 9 9 9 7 5 3 2