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Monthly climate in Hamilton, Montana, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Hamilton features a humid continental climate (Dfb).Temperatures typically range between -7 °C (20 °F) and 18 °C (64 °F) through the year, but rarely can drop to -28 °C (-18 °F) or can rise to as high as 35 °C (96 °F).The average annual precipitation amounts to about 899 mm (35.4 inches) and receives 164 rainy days on the 1 mm (0.04 inches) threshold annually.Hamilton enjoys an average of 2962 hours of sunshine throughout the year, and daylight varies from 8 hours 39 minutes to 15 hours 42 minutes per day.

Monthly average temperatures in Hamilton, Montana, United States §

The warmest months in Hamilton are June, July and August, with daily mean temperatures ranging from 12 to 18 °C (54 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -7 to -6 °C (20 - 22 °F) throughout the day. On average each year, Hamilton experiences 39 days above 25 °C (77.0 °F) and 196 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Hamilton, 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 5°C
(42°F)		 7°C
(45°F)		 12°C
(53°F)		 18°C
(65°F)		 26°C
(79°F)		 33°C
(91°F)		 33°C
(92°F)		 35°C
(96°F)		 31°C
(89°F)		 23°C
(73°F)		 13°C
(55°F)		 10°C
(51°F)
Mean maximum 3°C
(38°F)		 6°C
(42°F)		 10°C
(50°F)		 14°C
(58°F)		 22°C
(71°F)		 25°C
(77°F)		 31°C
(89°F)		 32°C
(90°F)		 29°C
(85°F)		 19°C
(66°F)		 9°C
(49°F)		 5°C
(41°F)
Average high -3°C
(27°F)		 -3°C
(28°F)		 3°C
(38°F)		 6°C
(43°F)		 12°C
(54°F)		 19°C
(66°F)		 26°C
(79°F)		 25°C
(77°F)		 19°C
(66°F)		 8°C
(47°F)		 2°C
(35°F)		 -3°C
(27°F)
Daily mean -6°C
(22°F)		 -6°C
(21°F)		 -1°C
(30°F)		 1°C
(34°F)		 6°C
(43°F)		 12°C
(54°F)		 18°C
(64°F)		 17°C
(62°F)		 11°C
(53°F)		 2°C
(37°F)		 -3°C
(27°F)		 -7°C
(20°F)
Average low -9°C
(16°F)		 -10°C
(15°F)		 -5°C
(23°F)		 -4°C
(26°F)		 0°C
(33°F)		 5°C
(42°F)		 9°C
(48°F)		 9°C
(48°F)		 4°C
(40°F)		 -3°C
(27°F)		 -7°C
(19°F)		 -11°C
(13°F)
Mean minimum -19°C
(-3°F)		 -22°C
(-7°F)		 -14°C
(7°F)		 -11°C
(12°F)		 -6°C
(21°F)		 -2°C
(29°F)		 3°C
(38°F)		 3°C
(37°F)		 -5°C
(24°F)		 -15°C
(5°F)		 -19°C
(-2°F)		 -21°C
(-6°F)
Minimum -28°C
(-18°F)		 -28°C
(-18°F)		 -21°C
(-5°F)		 -16°C
(3°F)		 -10°C
(14°F)		 -4°C
(25°F)		 1°C
(34°F)		 1°C
(34°F)		 -8°C
(18°F)		 -28°C
(-17°F)		 -21°C
(-6°F)		 -24°C
(-11°F)

Compare climate in Hamilton with other places

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

Monthly average precipitation in Hamilton, Montana, United States §

Hamilton usually has the most precipitation in February, June and December, with an average of 17 rainy days and 107 mm (4.2 inches) of precipitation per month.The driest months in Hamilton are July, August and September. On average, 34 mm (1.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hamilton, 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) 65 (2.6) 138 (5.4) 82 (3.2) 88 (3.4) 76 (3.0) 94 (3.7) 26 (1.0) 32 (1.2) 45 (1.8) 85 (3.4) 81 (3.2) 88 (3.5)
Average precipitation days (≥ 1 mm) 13 21 17 16 16 14 8 6 7 14 15 17

Monthly sunshine hours in Hamilton, Montana, United States §

The sunniest months in Hamilton are June, July and August, when the sun shines an average of 11 hours 52 minutes a day.Least sunny months in Hamilton: January, February and December receive an average of 4 hours 21 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Hamilton, 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 118 138 234 260 315 337 401 352 277 217 167 140
Mean daily daylight hours 9h 4m 10h 21m 11h 57m 13h 36m 15h 0m 15h 42m 15h 19m 14h 3m 12h 28m 10h 50m 9h 24m 8h 39m

Solar UV radiation in Hamilton, Montana, United States §

Hamilton experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 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 Hamilton UV Index data.

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