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Monthly climate in Roundup, Montana, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Roundup features a cold semi-arid climate (BSk).Temperatures typically range between -7 °C (20 °F) and 23 °C (75 °F) through the year, but rarely can drop to -37 °C (-35 °F) or can rise to as high as 39 °C (103 °F).The average annual precipitation amounts to about 440 mm (17.3 inches) and receives 89 rainy days on the 1 mm (0.04 inches) threshold annually.Roundup enjoys an average of 3133 hours of sunshine throughout the year, and daylight varies from 8 hours 38 minutes to 15 hours 44 minutes per day.

Monthly average temperatures in Roundup, Montana, United States §

The warmest months in Roundup are June, July and August, with daily mean temperatures ranging from 19 to 23 °C (66 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -7 to -2 °C (20 - 29 °F) throughout the day. On average each year, Roundup experiences 75 days above 25 °C (77.0 °F) and 132 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Roundup, 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
(55°F)		 16°C
(61°F)		 24°C
(76°F)		 26°C
(80°F)		 30°C
(87°F)		 39°C
(103°F)		 39°C
(103°F)		 39°C
(102°F)		 37°C
(99°F)		 30°C
(87°F)		 23°C
(73°F)		 20°C
(68°F)
Mean maximum 11°C
(53°F)		 13°C
(55°F)		 19°C
(67°F)		 25°C
(78°F)		 28°C
(83°F)		 32°C
(89°F)		 37°C
(99°F)		 37°C
(98°F)		 34°C
(94°F)		 26°C
(79°F)		 19°C
(66°F)		 15°C
(59°F)
Average high 1°C
(34°F)		 -2°C
(29°F)		 8°C
(46°F)		 12°C
(54°F)		 18°C
(65°F)		 25°C
(78°F)		 31°C
(88°F)		 30°C
(85°F)		 23°C
(74°F)		 14°C
(57°F)		 8°C
(46°F)		 3°C
(37°F)
Daily mean -3°C
(26°F)		 -7°C
(20°F)		 2°C
(35°F)		 6°C
(43°F)		 12°C
(55°F)		 19°C
(66°F)		 23°C
(75°F)		 22°C
(72°F)		 16°C
(62°F)		 7°C
(46°F)		 2°C
(37°F)		 -2°C
(29°F)
Average low -7°C
(19°F)		 -12°C
(11°F)		 -3°C
(26°F)		 0°C
(32°F)		 6°C
(44°F)		 12°C
(54°F)		 16°C
(60°F)		 15°C
(59°F)		 10°C
(50°F)		 2°C
(36°F)		 -2°C
(28°F)		 -6°C
(22°F)
Mean minimum -25°C
(-12°F)		 -28°C
(-18°F)		 -16°C
(3°F)		 -10°C
(15°F)		 -0°C
(32°F)		 6°C
(44°F)		 9°C
(49°F)		 9°C
(48°F)		 2°C
(36°F)		 -8°C
(17°F)		 -14°C
(7°F)		 -18°C
(-0°F)
Minimum -29°C
(-20°F)		 -37°C
(-35°F)		 -33°C
(-27°F)		 -19°C
(-2°F)		 -4°C
(25°F)		 5°C
(41°F)		 5°C
(42°F)		 8°C
(46°F)		 1°C
(34°F)		 -18°C
(-0°F)		 -23°C
(-9°F)		 -27°C
(-17°F)

Compare climate in Roundup with other places

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

Monthly average precipitation in Roundup, Montana, United States §

Roundup usually has the most precipitation in April, May and June, with an average of 10 rainy days and 65 mm (2.6 inches) of precipitation per month.The driest months in Roundup are January, July and August. On average, 20 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Roundup, 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) 19 (0.7) 36 (1.4) 27 (1.1) 61 (2.4) 65 (2.6) 69 (2.7) 22 (0.9) 20 (0.8) 38 (1.5) 34 (1.3) 23 (0.9) 26 (1.0)
Average precipitation days (≥ 1 mm) 5 9 7 11 11 10 6 5 5 7 6 7

Monthly sunshine hours in Roundup, Montana, United States §

The sunniest months in Roundup are June, July and August, when the sun shines an average of 11 hours 45 minutes a day.Least sunny months in Roundup: January, February and December receive an average of 5 hours 42 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Roundup, 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 150 190 260 264 312 356 387 338 268 232 192 179
Mean daily daylight hours 9h 3m 10h 20m 11h 57m 13h 36m 15h 1m 15h 44m 15h 20m 14h 4m 12h 28m 10h 50m 9h 23m 8h 38m

Solar UV radiation in Roundup, Montana, United States §

Roundup experiences the highest level of ultraviolet (UV) radiation in April, June and July, 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 Roundup UV Index data.

Average daily maximum UV levels by month for Roundup, 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 5 5 9 9 10 10 9 8 5 3 2