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Monthly climate in Sidney, Montana, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Sidney features a cold semi-arid climate (BSk).Temperatures typically range between -11 °C (13 °F) and 23 °C (73 °F) through the year, but rarely can drop to -39 °C (-39 °F) or can rise to as high as 40 °C (103 °F).The average annual precipitation amounts to about 402 mm (15.8 inches) and receives 68 rainy days on the 1 mm (0.04 inches) threshold annually.Sidney enjoys an average of 3143 hours of sunshine throughout the year, and daylight varies from 8 hours 28 minutes to 15 hours 55 minutes per day.

Monthly average temperatures in Sidney, Montana, United States §

The warmest months in Sidney are June, July and August, with daily mean temperatures ranging from 19 to 23 °C (67 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -11 to -6 °C (13 - 22 °F) throughout the day. On average each year, Sidney experiences 70 days above 25 °C (77.0 °F) and 159 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sidney, 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 10°C
(51°F)		 14°C
(58°F)		 20°C
(69°F)		 26°C
(80°F)		 33°C
(92°F)		 36°C
(97°F)		 39°C
(102°F)		 40°C
(103°F)		 35°C
(96°F)		 32°C
(90°F)		 23°C
(74°F)		 18°C
(64°F)
Mean maximum 8°C
(46°F)		 10°C
(51°F)		 17°C
(63°F)		 23°C
(74°F)		 30°C
(86°F)		 31°C
(88°F)		 35°C
(96°F)		 37°C
(99°F)		 33°C
(92°F)		 26°C
(79°F)		 17°C
(63°F)		 12°C
(53°F)
Average high -3°C
(26°F)		 -5°C
(23°F)		 5°C
(41°F)		 11°C
(51°F)		 19°C
(67°F)		 26°C
(79°F)		 30°C
(86°F)		 28°C
(83°F)		 22°C
(72°F)		 12°C
(54°F)		 4°C
(40°F)		 -1°C
(31°F)
Daily mean -8°C
(17°F)		 -11°C
(13°F)		 -1°C
(31°F)		 5°C
(41°F)		 13°C
(55°F)		 19°C
(67°F)		 23°C
(73°F)		 21°C
(70°F)		 15°C
(60°F)		 6°C
(43°F)		 -1°C
(31°F)		 -6°C
(22°F)
Average low -13°C
(10°F)		 -15°C
(4°F)		 -6°C
(22°F)		 -1°C
(30°F)		 6°C
(44°F)		 13°C
(55°F)		 16°C
(60°F)		 14°C
(57°F)		 9°C
(48°F)		 1°C
(33°F)		 -5°C
(22°F)		 -10°C
(14°F)
Mean minimum -31°C
(-23°F)		 -29°C
(-21°F)		 -20°C
(-3°F)		 -13°C
(10°F)		 -1°C
(31°F)		 7°C
(45°F)		 10°C
(50°F)		 8°C
(46°F)		 1°C
(34°F)		 -9°C
(16°F)		 -16°C
(3°F)		 -24°C
(-12°F)
Minimum -39°C
(-39°F)		 -38°C
(-36°F)		 -28°C
(-18°F)		 -20°C
(-4°F)		 -5°C
(24°F)		 5°C
(42°F)		 8°C
(46°F)		 7°C
(45°F)		 -3°C
(26°F)		 -17°C
(2°F)		 -19°C
(-2°F)		 -33°C
(-27°F)

Compare climate in Sidney with other places

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

Monthly average precipitation in Sidney, Montana, United States §

Sidney usually has the most precipitation in May, June and September, with an average of 7 rainy days and 60 mm (2.3 inches) of precipitation per month.The driest months in Sidney are January, November and December. On average, 16 mm (0.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sidney, 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) 10 (0.4) 22 (0.8) 21 (0.8) 25 (1.0) 53 (2.1) 67 (2.6) 38 (1.5) 39 (1.5) 60 (2.3) 30 (1.2) 19 (0.7) 18 (0.7)
Average precipitation days (≥ 1 mm) 3 5 5 6 8 9 7 6 6 5 4 4

Monthly sunshine hours in Sidney, Montana, United States §

The sunniest months in Sidney are June, July and August, when the sun shines an average of 11 hours 54 minutes a day.Least sunny months in Sidney: January, November and December receive an average of 5 hours 34 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sidney, 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 146 197 247 271 320 371 386 337 269 227 188 178
Mean daily daylight hours 8h 54m 10h 15m 11h 57m 13h 40m 15h 10m 15h 55m 15h 30m 14h 10m 12h 30m 10h 46m 9h 15m 8h 28m

Solar UV radiation in Sidney, Montana, United States §

Sidney 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 Sidney UV Index data.

Average daily maximum UV levels by month for Sidney, 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 5 9 8 10 10 9 7 5 3 2