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Monthly climate in Challis, Idaho, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Challis features a humid continental climate (Dfb).Temperatures typically range between -9 °C (16 °F) and 18 °C (65 °F) through the year, but rarely can drop to -33 °C (-27 °F) or can rise to as high as 33 °C (91 °F).The average annual precipitation amounts to about 501 mm (19.7 inches) and receives 121 rainy days on the 1 mm (0.04 inches) threshold annually.Challis enjoys an average of 3243 hours of sunshine throughout the year, and daylight varies from 8 hours 52 minutes to 15 hours 28 minutes per day.

Monthly average temperatures in Challis, Idaho, United States §

The warmest months in Challis are June, July and August, with daily mean temperatures ranging from 13 to 18 °C (55 - 65 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -9 to -8 °C (16 - 18 °F) throughout the day. On average each year, Challis experiences 41 days above 25 °C (77.0 °F) and 206 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Challis, Idaho, 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)		 5°C
(41°F)		 11°C
(53°F)		 15°C
(59°F)		 25°C
(78°F)		 31°C
(88°F)		 31°C
(89°F)		 33°C
(91°F)		 31°C
(88°F)		 24°C
(75°F)		 15°C
(59°F)		 9°C
(49°F)
Mean maximum 3°C
(37°F)		 4°C
(40°F)		 9°C
(48°F)		 13°C
(56°F)		 21°C
(70°F)		 24°C
(75°F)		 30°C
(86°F)		 31°C
(88°F)		 29°C
(85°F)		 18°C
(65°F)		 10°C
(50°F)		 4°C
(40°F)
Average high -4°C
(24°F)		 -3°C
(27°F)		 2°C
(37°F)		 6°C
(43°F)		 12°C
(54°F)		 19°C
(67°F)		 26°C
(80°F)		 25°C
(77°F)		 20°C
(67°F)		 9°C
(48°F)		 3°C
(37°F)		 -4°C
(25°F)
Daily mean -9°C
(16°F)		 -8°C
(18°F)		 -3°C
(27°F)		 0°C
(33°F)		 6°C
(44°F)		 13°C
(55°F)		 18°C
(65°F)		 17°C
(63°F)		 12°C
(54°F)		 3°C
(37°F)		 -3°C
(27°F)		 -9°C
(16°F)
Average low -14°C
(8°F)		 -13°C
(10°F)		 -8°C
(18°F)		 -5°C
(23°F)		 0°C
(33°F)		 6°C
(43°F)		 10°C
(50°F)		 9°C
(49°F)		 4°C
(40°F)		 -3°C
(27°F)		 -8°C
(18°F)		 -14°C
(7°F)
Mean minimum -25°C
(-14°F)		 -22°C
(-8°F)		 -18°C
(1°F)		 -14°C
(7°F)		 -7°C
(20°F)		 -2°C
(29°F)		 5°C
(41°F)		 4°C
(39°F)		 -4°C
(26°F)		 -13°C
(8°F)		 -17°C
(2°F)		 -26°C
(-15°F)
Minimum -33°C
(-27°F)		 -28°C
(-18°F)		 -23°C
(-10°F)		 -17°C
(2°F)		 -10°C
(14°F)		 -4°C
(25°F)		 2°C
(36°F)		 1°C
(34°F)		 -6°C
(21°F)		 -21°C
(-5°F)		 -23°C
(-10°F)		 -30°C
(-21°F)

Compare climate in Challis with other places

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

Monthly average precipitation in Challis, Idaho, United States §

Challis usually has the most precipitation in February, May and June, with an average of 13 rainy days and 64 mm (2.5 inches) of precipitation per month.The driest months in Challis are July, August and September. On average, 24 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Challis, Idaho, 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) 34 (1.3) 65 (2.6) 40 (1.6) 49 (1.9) 68 (2.7) 59 (2.3) 18 (0.7) 23 (0.9) 30 (1.2) 42 (1.7) 34 (1.3) 38 (1.5)
Average precipitation days (≥ 1 mm) 9 16 10 12 15 10 6 7 6 9 10 11

Monthly sunshine hours in Challis, Idaho, United States §

The sunniest months in Challis are June, July and August, when the sun shines an average of 12 hours 15 minutes a day.Least sunny months in Challis: January, February and December receive an average of 5 hours 10 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Challis, Idaho, 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 133 170 267 299 339 366 402 359 300 241 195 167
Mean daily daylight hours 9h 15m 10h 27m 11h 57m 13h 30m 14h 49m 15h 28m 15h 6m 13h 56m 12h 27m 10h 55m 9h 34m 8h 52m

Solar UV radiation in Challis, Idaho, United States §

Challis experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme 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 4. For more detailed information, check out our hourly Challis UV Index data.

Average daily maximum UV levels by month for Challis, Idaho, 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) 3 5 8 9 11 11 11 10 9 6 4 2