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Monthly climate in Fairfield, Idaho, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Fairfield features a humid continental climate (Dsb). Temperatures typically range between -5 °C (24 °F) and 23 °C (74 °F) through the year, but rarely can drop to -23 °C (-9 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 457 mm (18.0 inches) and receives 79 rainy days on the 1 mm (0.04 inches) threshold annually. Fairfield enjoys an average of 3357 hours of sunshine throughout the year, and daylight varies from 9 hours 0 minutes to 15 hours 19 minutes per day.

Monthly average temperatures in Fairfield, Idaho, United States §

The warmest months in Fairfield are June, July and August, with daily mean temperatures ranging from 18 to 23 °C (64 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to -3 °C (24 - 27 °F) throughout the day. On average each year, Fairfield experiences 74 days above 25 °C (77.0 °F) and 150 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Fairfield, 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 9°C
(48°F)		 11°C
(51°F)		 19°C
(66°F)		 26°C
(79°F)		 32°C
(90°F)		 35°C
(95°F)		 36°C
(97°F)		 37°C
(99°F)		 36°C
(97°F)		 26°C
(80°F)		 18°C
(65°F)		 11°C
(53°F)
Mean maximum 5°C
(40°F)		 8°C
(47°F)		 15°C
(60°F)		 22°C
(72°F)		 28°C
(82°F)		 29°C
(84°F)		 35°C
(96°F)		 36°C
(96°F)		 33°C
(92°F)		 22°C
(72°F)		 14°C
(58°F)		 7°C
(45°F)
Average high -1°C
(31°F)		 1°C
(35°F)		 8°C
(46°F)		 12°C
(53°F)		 18°C
(64°F)		 24°C
(76°F)		 31°C
(88°F)		 29°C
(85°F)		 24°C
(75°F)		 14°C
(57°F)		 7°C
(44°F)		 -0°C
(32°F)
Daily mean -5°C
(24°F)		 -3°C
(27°F)		 2°C
(36°F)		 6°C
(43°F)		 11°C
(53°F)		 18°C
(64°F)		 23°C
(74°F)		 22°C
(71°F)		 16°C
(61°F)		 7°C
(45°F)		 1°C
(35°F)		 -4°C
(24°F)
Average low -8°C
(18°F)		 -7°C
(19°F)		 -3°C
(27°F)		 -0°C
(32°F)		 5°C
(41°F)		 10°C
(50°F)		 14°C
(58°F)		 13°C
(56°F)		 8°C
(47°F)		 1°C
(35°F)		 -3°C
(26°F)		 -9°C
(17°F)
Mean minimum -18°C
(1°F)		 -16°C
(3°F)		 -12°C
(10°F)		 -8°C
(18°F)		 -2°C
(28°F)		 3°C
(37°F)		 9°C
(48°F)		 7°C
(45°F)		 1°C
(34°F)		 -7°C
(20°F)		 -11°C
(13°F)		 -17°C
(1°F)
Minimum -23°C
(-9°F)		 -21°C
(-6°F)		 -15°C
(5°F)		 -12°C
(10°F)		 -4°C
(25°F)		 1°C
(34°F)		 4°C
(40°F)		 4°C
(40°F)		 -2°C
(29°F)		 -15°C
(6°F)		 -14°C
(6°F)		 -21°C
(-6°F)

Compare climate in Fairfield with other places

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

Monthly average precipitation in Fairfield, Idaho, United States §

Fairfield usually has the most precipitation in January, February and March, with an average of 10 rainy days and 64 mm (2.5 inches) of precipitation per month. The driest months in Fairfield are June, July and August. On average, 12 mm (0.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Fairfield, 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) 62 (2.5) 75 (3.0) 54 (2.1) 35 (1.4) 48 (1.9) 17 (0.7) 4 (0.1) 15 (0.6) 18 (0.7) 34 (1.3) 48 (1.9) 48 (1.9)
Average precipitation days (≥ 1 mm) 9 11 10 8 9 4 0 3 3 5 7 10

Monthly sunshine hours in Fairfield, Idaho, United States §

The sunniest months in Fairfield are June, July and August, when the sun shines an average of 12 hours 26 minutes a day. Least sunny months in Fairfield: January, February and December receive an average of 5 hours 33 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Fairfield, 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 141 187 271 302 346 382 399 362 307 267 212 175
Mean daily daylight hours 9h 22m 10h 31m 11h 58m 13h 27m 14h 42m 15h 19m 14h 59m 13h 51m 12h 26m 10h 57m 9h 40m 9h 0m

Solar UV radiation in Fairfield, Idaho, United States §

Fairfield 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 Fairfield UV Index data.

Average daily maximum UV levels by month for Fairfield, 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 9 10 11 11 10 9 6 4 3

Detailed Monthly Weather Insights for Fairfield, Idaho, United States

Discover in-depth weather details for every month in Fairfield. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Fairfield's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.