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Monthly climate in Eureka, Montana, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Eureka features a humid continental climate (Dfb).Temperatures typically range between -9 °C (16 °F) and 18 °C (64 °F) through the year, but rarely can drop to -34 °C (-30 °F) or can rise to as high as 37 °C (98 °F).The average annual precipitation amounts to about 682 mm (26.9 inches) and receives 138 rainy days on the 1 mm (0.04 inches) threshold annually.Eureka enjoys an average of 2799 hours of sunshine throughout the year, and daylight varies from 8 hours 18 minutes to 16 hours 5 minutes per day.

Monthly average temperatures in Eureka, Montana, United States §

The warmest months in Eureka are June, July and August, with daily mean temperatures ranging from 13 to 18 °C (56 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -9 to -5 °C (16 - 24 °F) throughout the day. On average each year, Eureka experiences 34 days above 25 °C (77.0 °F) and 178 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Eureka, 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
(41°F)		 11°C
(51°F)		 15°C
(60°F)		 24°C
(76°F)		 27°C
(81°F)		 36°C
(97°F)		 36°C
(97°F)		 37°C
(98°F)		 30°C
(86°F)		 23°C
(73°F)		 12°C
(54°F)		 10°C
(50°F)
Mean maximum 4°C
(39°F)		 5°C
(42°F)		 12°C
(53°F)		 17°C
(64°F)		 24°C
(75°F)		 26°C
(79°F)		 33°C
(91°F)		 33°C
(92°F)		 28°C
(82°F)		 18°C
(66°F)		 10°C
(50°F)		 6°C
(43°F)
Average high -3°C
(28°F)		 -4°C
(24°F)		 3°C
(38°F)		 8°C
(46°F)		 15°C
(59°F)		 19°C
(67°F)		 25°C
(77°F)		 25°C
(77°F)		 18°C
(64°F)		 9°C
(48°F)		 2°C
(37°F)		 -2°C
(29°F)
Daily mean -7°C
(20°F)		 -9°C
(16°F)		 -2°C
(29°F)		 3°C
(37°F)		 9°C
(48°F)		 13°C
(56°F)		 18°C
(64°F)		 17°C
(63°F)		 11°C
(53°F)		 3°C
(38°F)		 -1°C
(31°F)		 -5°C
(24°F)
Average low -11°C
(13°F)		 -14°C
(7°F)		 -7°C
(20°F)		 -2°C
(28°F)		 3°C
(37°F)		 7°C
(44°F)		 9°C
(49°F)		 9°C
(49°F)		 6°C
(42°F)		 -1°C
(30°F)		 -4°C
(25°F)		 -8°C
(18°F)
Mean minimum -26°C
(-14°F)		 -29°C
(-19°F)		 -21°C
(-6°F)		 -11°C
(13°F)		 -3°C
(27°F)		 1°C
(33°F)		 5°C
(41°F)		 4°C
(39°F)		 -2°C
(29°F)		 -12°C
(10°F)		 -16°C
(4°F)		 -20°C
(-4°F)
Minimum -31°C
(-24°F)		 -34°C
(-30°F)		 -32°C
(-26°F)		 -19°C
(-1°F)		 -5°C
(23°F)		 -1°C
(31°F)		 3°C
(38°F)		 3°C
(38°F)		 -4°C
(25°F)		 -19°C
(-2°F)		 -24°C
(-11°F)		 -28°C
(-18°F)

Compare climate in Eureka with other places

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

Monthly average precipitation in Eureka, Montana, United States §

Eureka usually has the most precipitation in February, October and December, with an average of 13 rainy days and 72 mm (2.8 inches) of precipitation per month.The driest months in Eureka are July, August and September. On average, 30 mm (1.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Eureka, 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) 51 (2.0) 70 (2.8) 58 (2.3) 66 (2.6) 64 (2.5) 68 (2.7) 23 (0.9) 29 (1.2) 38 (1.5) 70 (2.7) 69 (2.7) 76 (3.0)
Average precipitation days (≥ 1 mm) 13 14 14 15 12 12 5 6 7 11 15 14

Monthly sunshine hours in Eureka, Montana, United States §

The sunniest months in Eureka are June, July and August, when the sun shines an average of 12 hours 2 minutes a day.Least sunny months in Eureka: January, November and December receive an average of 3 hours 3 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Eureka, 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 81 144 218 262 311 350 406 350 270 202 105 93
Mean daily daylight hours 8h 45m 10h 11m 11h 56m 13h 45m 15h 18m 16h 5m 15h 39m 14h 15m 12h 31m 10h 43m 9h 8m 8h 18m

Solar UV radiation in Eureka, Montana, United States §

Eureka experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 9, which corresponds to the Very High category of sun exposure.January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Eureka UV Index data.

Average daily maximum UV levels by month for Eureka, 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 3 5 7 8 9 9 9 7 4 2 1