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Monthly climate in Big Sky, Montana, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Big Sky features a humid continental climate (Dfb).Temperatures typically range between -9 °C (15 °F) and 15 °C (60 °F) through the year, but rarely can drop to -33 °C (-27 °F) or can rise to as high as 29 °C (85 °F).The average annual precipitation amounts to about 818 mm (32.2 inches) and receives 163 rainy days on the 1 mm (0.04 inches) threshold annually.Big Sky enjoys an average of 3166 hours of sunshine throughout the year, and daylight varies from 8 hours 46 minutes to 15 hours 34 minutes per day.

Monthly average temperatures in Big Sky, Montana, United States §

The warmest months in Big Sky are June, July and August, with daily mean temperatures ranging from 10 to 15 °C (51 - 60 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -9 to -9 °C (15 - 16 °F) throughout the day. On average each year, Big Sky experiences 15 days above 25 °C (77.0 °F) and 221 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Big Sky, 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 3°C
(37°F)		 5°C
(42°F)		 12°C
(53°F)		 15°C
(59°F)		 21°C
(70°F)		 27°C
(81°F)		 29°C
(85°F)		 29°C
(85°F)		 28°C
(83°F)		 20°C
(68°F)		 12°C
(54°F)		 7°C
(44°F)
Mean maximum 1°C
(33°F)		 3°C
(38°F)		 8°C
(47°F)		 12°C
(54°F)		 17°C
(62°F)		 21°C
(70°F)		 27°C
(81°F)		 27°C
(81°F)		 25°C
(78°F)		 15°C
(60°F)		 8°C
(47°F)		 3°C
(38°F)
Average high -5°C
(23°F)		 -5°C
(23°F)		 1°C
(34°F)		 4°C
(39°F)		 9°C
(48°F)		 17°C
(62°F)		 23°C
(73°F)		 22°C
(71°F)		 16°C
(61°F)		 5°C
(42°F)		 -0°C
(32°F)		 -5°C
(23°F)
Daily mean -9°C
(16°F)		 -9°C
(15°F)		 -4°C
(26°F)		 -1°C
(30°F)		 3°C
(38°F)		 10°C
(51°F)		 15°C
(60°F)		 14°C
(58°F)		 9°C
(48°F)		 -1°C
(31°F)		 -5°C
(23°F)		 -9°C
(16°F)
Average low -12°C
(10°F)		 -13°C
(8°F)		 -8°C
(18°F)		 -6°C
(22°F)		 -2°C
(29°F)		 3°C
(38°F)		 7°C
(46°F)		 7°C
(44°F)		 2°C
(36°F)		 -6°C
(21°F)		 -10°C
(13°F)		 -13°C
(9°F)
Mean minimum -24°C
(-11°F)		 -26°C
(-15°F)		 -19°C
(-2°F)		 -16°C
(4°F)		 -8°C
(18°F)		 -4°C
(26°F)		 1°C
(35°F)		 1°C
(34°F)		 -6°C
(22°F)		 -19°C
(-2°F)		 -21°C
(-5°F)		 -24°C
(-10°F)
Minimum -28°C
(-19°F)		 -33°C
(-27°F)		 -27°C
(-17°F)		 -20°C
(-4°F)		 -11°C
(13°F)		 -8°C
(17°F)		 -2°C
(29°F)		 -2°C
(29°F)		 -9°C
(16°F)		 -30°C
(-22°F)		 -22°C
(-7°F)		 -27°C
(-15°F)

Compare climate in Big Sky with other places

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

Monthly average precipitation in Big Sky, Montana, United States §

Big Sky usually has the most precipitation in April, May and June, with an average of 17 rainy days and 94 mm (3.7 inches) of precipitation per month.The driest months in Big Sky are January, July and December. On average, 45 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Big Sky, 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) 42 (1.6) 82 (3.2) 65 (2.6) 90 (3.6) 89 (3.5) 102 (4.0) 44 (1.7) 56 (2.2) 59 (2.3) 77 (3.0) 61 (2.4) 49 (1.9)
Average precipitation days (≥ 1 mm) 11 17 13 16 19 16 12 11 8 14 13 13

Monthly sunshine hours in Big Sky, Montana, United States §

The sunniest months in Big Sky are June, July and August, when the sun shines an average of 11 hours 55 minutes a day.Least sunny months in Big Sky: January, February and December receive an average of 5 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Big Sky, 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 139 170 264 275 322 356 392 349 284 245 191 176
Mean daily daylight hours 9h 10m 10h 24m 11h 57m 13h 33m 14h 54m 15h 34m 15h 12m 13h 59m 12h 27m 10h 53m 9h 29m 8h 46m

Solar UV radiation in Big Sky, Montana, United States §

Big Sky experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme 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 4. For more detailed information, check out our hourly Big Sky UV Index data.

Average daily maximum UV levels by month for Big Sky, 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) 3 4 7 9 11 12 11 10 9 6 4 2