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Monthly climate in Plains, Montana, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Plains features a humid continental climate (Dfb).Temperatures typically range between -6 °C (22 °F) and 20 °C (68 °F) through the year, but rarely can drop to -27 °C (-17 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 828 mm (32.6 inches) and receives 148 rainy days on the 1 mm (0.04 inches) threshold annually.Plains enjoys an average of 2727 hours of sunshine throughout the year, and daylight varies from 8 hours 30 minutes to 15 hours 52 minutes per day.

Monthly average temperatures in Plains, Montana, United States §

The warmest months in Plains are June, July and August, with daily mean temperatures ranging from 15 to 20 °C (58 - 68 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -3 °C (22 - 27 °F) throughout the day. On average each year, Plains experiences 47 days above 25 °C (77.0 °F) and 162 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Plains, 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 6°C
(43°F)		 12°C
(54°F)		 17°C
(63°F)		 24°C
(76°F)		 29°C
(84°F)		 36°C
(98°F)		 37°C
(99°F)		 38°C
(101°F)		 32°C
(90°F)		 25°C
(77°F)		 14°C
(57°F)		 13°C
(57°F)
Mean maximum 5°C
(41°F)		 8°C
(46°F)		 11°C
(52°F)		 20°C
(68°F)		 25°C
(78°F)		 27°C
(81°F)		 34°C
(93°F)		 35°C
(95°F)		 30°C
(87°F)		 21°C
(69°F)		 12°C
(53°F)		 8°C
(46°F)
Average high -1°C
(31°F)		 -2°C
(29°F)		 5°C
(41°F)		 9°C
(49°F)		 16°C
(61°F)		 20°C
(69°F)		 27°C
(82°F)		 27°C
(80°F)		 20°C
(68°F)		 10°C
(51°F)		 4°C
(39°F)		 0°C
(32°F)
Daily mean -4°C
(25°F)		 -6°C
(22°F)		 0°C
(32°F)		 4°C
(39°F)		 10°C
(50°F)		 15°C
(58°F)		 20°C
(68°F)		 19°C
(66°F)		 13°C
(55°F)		 5°C
(41°F)		 0°C
(33°F)		 -3°C
(27°F)
Average low -8°C
(19°F)		 -10°C
(14°F)		 -4°C
(25°F)		 -1°C
(30°F)		 4°C
(40°F)		 8°C
(47°F)		 11°C
(52°F)		 11°C
(52°F)		 7°C
(44°F)		 -0°C
(32°F)		 -3°C
(27°F)		 -6°C
(21°F)
Mean minimum -19°C
(-1°F)		 -23°C
(-9°F)		 -14°C
(7°F)		 -7°C
(19°F)		 -3°C
(28°F)		 1°C
(35°F)		 5°C
(42°F)		 4°C
(40°F)		 -1°C
(31°F)		 -9°C
(16°F)		 -11°C
(12°F)		 -16°C
(4°F)
Minimum -27°C
(-16°F)		 -27°C
(-17°F)		 -23°C
(-9°F)		 -12°C
(10°F)		 -5°C
(23°F)		 1°C
(34°F)		 4°C
(39°F)		 2°C
(36°F)		 -4°C
(25°F)		 -20°C
(-4°F)		 -15°C
(6°F)		 -23°C
(-9°F)

Compare climate in Plains with other places

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

Monthly average precipitation in Plains, Montana, United States §

Plains usually has the most precipitation in February, November and December, with an average of 15 rainy days and 97 mm (3.8 inches) of precipitation per month.The driest months in Plains are July, August and September. On average, 29 mm (1.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Plains, 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) 69 (2.7) 111 (4.4) 72 (2.8) 85 (3.3) 82 (3.2) 60 (2.4) 21 (0.8) 27 (1.1) 39 (1.5) 83 (3.3) 91 (3.6) 88 (3.5)
Average precipitation days (≥ 1 mm) 13 17 15 17 15 13 4 6 7 11 15 15

Monthly sunshine hours in Plains, Montana, United States §

The sunniest months in Plains are June, July and August, when the sun shines an average of 11 hours 52 minutes a day.Least sunny months in Plains: January, February and December receive an average of 3 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Plains, 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 87 117 210 239 303 334 407 349 266 206 117 88
Mean daily daylight hours 8h 56m 10h 16m 11h 57m 13h 40m 15h 8m 15h 52m 15h 28m 14h 8m 12h 29m 10h 47m 9h 16m 8h 30m

Solar UV radiation in Plains, Montana, United States §

Plains experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November 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 Plains UV Index data.

Average daily maximum UV levels by month for Plains, 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 4 6 7 9 9 10 9 7 5 3 2