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Monthly climate in American Falls, Idaho, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification American Falls features a cold semi-arid climate (BSk).Temperatures typically range between -3 °C (26 °F) and 24 °C (76 °F) through the year, but rarely can drop to -26 °C (-14 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 437 mm (17.2 inches) and receives 94 rainy days on the 1 mm (0.04 inches) threshold annually.American Falls enjoys an average of 3253 hours of sunshine throughout the year, and daylight varies from 9 hours 4 minutes to 15 hours 15 minutes per day.

Monthly average temperatures in American Falls, Idaho, United States §

The warmest months in American Falls are June, July and August, with daily mean temperatures ranging from 19 to 24 °C (67 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to -2 °C (26 - 29 °F) throughout the day. On average each year, American Falls experiences 84 days above 25 °C (77.0 °F) and 128 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in American Falls, 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 11°C
(52°F)		 13°C
(56°F)		 19°C
(67°F)		 26°C
(80°F)		 32°C
(91°F)		 36°C
(97°F)		 37°C
(99°F)		 37°C
(99°F)		 36°C
(97°F)		 26°C
(80°F)		 21°C
(69°F)		 13°C
(56°F)
Mean maximum 6°C
(43°F)		 8°C
(48°F)		 17°C
(62°F)		 23°C
(74°F)		 29°C
(84°F)		 30°C
(86°F)		 35°C
(96°F)		 36°C
(96°F)		 34°C
(94°F)		 24°C
(75°F)		 17°C
(62°F)		 7°C
(46°F)
Average high -0°C
(32°F)		 2°C
(36°F)		 9°C
(48°F)		 14°C
(57°F)		 19°C
(67°F)		 26°C
(79°F)		 32°C
(89°F)		 30°C
(87°F)		 24°C
(76°F)		 14°C
(58°F)		 8°C
(47°F)		 1°C
(34°F)
Daily mean -3°C
(26°F)		 -2°C
(29°F)		 3°C
(38°F)		 8°C
(46°F)		 13°C
(56°F)		 19°C
(67°F)		 24°C
(76°F)		 22°C
(73°F)		 17°C
(63°F)		 8°C
(47°F)		 3°C
(37°F)		 -3°C
(28°F)
Average low -7°C
(20°F)		 -5°C
(23°F)		 -1°C
(30°F)		 2°C
(36°F)		 7°C
(44°F)		 11°C
(53°F)		 16°C
(61°F)		 15°C
(59°F)		 10°C
(50°F)		 3°C
(37°F)		 -2°C
(30°F)		 -6°C
(22°F)
Mean minimum -17°C
(1°F)		 -14°C
(6°F)		 -9°C
(15°F)		 -5°C
(24°F)		 -0°C
(32°F)		 4°C
(39°F)		 10°C
(50°F)		 9°C
(48°F)		 2°C
(36°F)		 -7°C
(20°F)		 -9°C
(16°F)		 -14°C
(8°F)
Minimum -26°C
(-14°F)		 -17°C
(1°F)		 -13°C
(8°F)		 -7°C
(21°F)		 -2°C
(29°F)		 2°C
(36°F)		 8°C
(46°F)		 4°C
(40°F)		 1°C
(34°F)		 -14°C
(7°F)		 -11°C
(13°F)		 -16°C
(4°F)

Compare climate in American Falls with other places

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

Monthly average precipitation in American Falls, Idaho, United States §

American Falls usually has the most precipitation in February, April and May, with an average of 11 rainy days and 52 mm (2.1 inches) of precipitation per month.The driest months in American Falls are June, July and August. On average, 18 mm (0.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in American Falls, 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) 43 (1.7) 55 (2.2) 46 (1.8) 51 (2.0) 51 (2.0) 24 (0.9) 13 (0.5) 16 (0.6) 27 (1.1) 38 (1.5) 30 (1.2) 43 (1.7)
Average precipitation days (≥ 1 mm) 10 12 11 11 11 4 3 5 4 6 8 9

Monthly sunshine hours in American Falls, Idaho, United States §

The sunniest months in American Falls are June, July and August, when the sun shines an average of 12 hours 16 minutes a day.Least sunny months in American Falls: January, February and December receive an average of 5 hours 11 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in American Falls, 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 125 181 260 280 338 377 395 356 306 262 203 165
Mean daily daylight hours 9h 25m 10h 33m 11h 58m 13h 25m 14h 39m 15h 15m 14h 55m 13h 49m 12h 25m 10h 59m 9h 43m 9h 4m

Solar UV radiation in American Falls, Idaho, United States §

American Falls experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the 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 American Falls UV Index data.

Average daily maximum UV levels by month for American Falls, 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 7 8 10 11 11 10 9 6 4 3