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Monthly climate in Chester, Montana, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Chester features a cold semi-arid climate (BSk).Temperatures typically range between -9 °C (15 °F) and 22 °C (72 °F) through the year, but rarely can drop to -39 °C (-38 °F) or can rise to as high as 40 °C (105 °F).The average annual precipitation amounts to about 336 mm (13.2 inches) and receives 69 rainy days on the 1 mm (0.04 inches) threshold annually.Chester enjoys an average of 3137 hours of sunshine throughout the year, and daylight varies from 8 hours 21 minutes to 16 hours 2 minutes per day.

Monthly average temperatures in Chester, Montana, United States §

The warmest months in Chester are June, July and August, with daily mean temperatures ranging from 18 to 22 °C (64 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -9 to -5 °C (15 - 24 °F) throughout the day. On average each year, Chester experiences 61 days above 25 °C (77.0 °F) and 148 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Chester, 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)		 14°C
(58°F)		 21°C
(70°F)		 29°C
(84°F)		 32°C
(89°F)		 39°C
(102°F)		 38°C
(101°F)		 40°C
(105°F)		 35°C
(95°F)		 30°C
(86°F)		 20°C
(69°F)		 17°C
(63°F)
Mean maximum 9°C
(48°F)		 10°C
(50°F)		 16°C
(60°F)		 24°C
(76°F)		 29°C
(85°F)		 31°C
(89°F)		 37°C
(99°F)		 37°C
(99°F)		 32°C
(90°F)		 25°C
(77°F)		 15°C
(60°F)		 12°C
(54°F)
Average high -1°C
(30°F)		 -5°C
(24°F)		 4°C
(40°F)		 11°C
(51°F)		 18°C
(65°F)		 24°C
(75°F)		 30°C
(85°F)		 28°C
(82°F)		 21°C
(70°F)		 12°C
(53°F)		 5°C
(41°F)		 -0°C
(32°F)
Daily mean -6°C
(21°F)		 -9°C
(15°F)		 -1°C
(30°F)		 5°C
(41°F)		 12°C
(54°F)		 18°C
(64°F)		 22°C
(72°F)		 20°C
(69°F)		 14°C
(58°F)		 6°C
(42°F)		 0°C
(32°F)		 -5°C
(24°F)
Average low -11°C
(13°F)		 -14°C
(7°F)		 -6°C
(22°F)		 -1°C
(31°F)		 6°C
(43°F)		 11°C
(52°F)		 14°C
(57°F)		 13°C
(56°F)		 8°C
(47°F)		 0°C
(33°F)		 -5°C
(24°F)		 -9°C
(17°F)
Mean minimum -29°C
(-20°F)		 -28°C
(-17°F)		 -21°C
(-5°F)		 -11°C
(13°F)		 -0°C
(32°F)		 5°C
(42°F)		 8°C
(47°F)		 6°C
(43°F)		 0°C
(33°F)		 -11°C
(13°F)		 -17°C
(2°F)		 -22°C
(-8°F)
Minimum -34°C
(-29°F)		 -39°C
(-38°F)		 -35°C
(-30°F)		 -19°C
(-2°F)		 -4°C
(26°F)		 3°C
(38°F)		 6°C
(43°F)		 3°C
(38°F)		 -2°C
(28°F)		 -20°C
(-4°F)		 -22°C
(-6°F)		 -32°C
(-25°F)

Compare climate in Chester with other places

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

Monthly average precipitation in Chester, Montana, United States §

Chester usually has the most precipitation in April, May and June, with an average of 8 rainy days and 47 mm (1.9 inches) of precipitation per month.The driest months in Chester are January, March and July. On average, 14 mm (0.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Chester, 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) 33 (1.3) 18 (0.7) 37 (1.4) 57 (2.2) 48 (1.9) 10 (0.4) 25 (1.0) 28 (1.1) 20 (0.8) 28 (1.1) 20 (0.8)
Average precipitation days (≥ 1 mm) 3 7 5 8 8 9 3 4 5 5 7 5

Monthly sunshine hours in Chester, Montana, United States §

The sunniest months in Chester are June, July and August, when the sun shines an average of 12 hours 2 minutes a day.Least sunny months in Chester: January, November and December receive an average of 5 hours 19 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Chester, 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 149 181 262 271 320 359 402 346 269 233 176 164
Mean daily daylight hours 8h 48m 10h 12m 11h 56m 13h 43m 15h 15m 16h 2m 15h 36m 14h 13m 12h 30m 10h 44m 9h 10m 8h 21m

Solar UV radiation in Chester, Montana, United States §

Chester 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 Chester UV Index data.

Average daily maximum UV levels by month for Chester, 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