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Monthly climate in Fairfield, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Fairfield features a warm-summer Mediterranean climate (Csb).Temperatures typically range between -1 °C (31 °F) and 23 °C (74 °F) through the year, but rarely can drop to -21 °C (-5 °F) or can rise to as high as 44 °C (111 °F).The average annual precipitation amounts to about 620 mm (24.4 inches) and receives 106 rainy days on the 1 mm (0.04 inches) threshold annually.Fairfield enjoys an average of 2926 hours of sunshine throughout the year, and daylight varies from 8 hours 30 minutes to 15 hours 52 minutes per day.

Monthly average temperatures in Fairfield, Washington, United States §

The warmest months in Fairfield are June, July and August, with daily mean temperatures ranging from 19 to 23 °C (66 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 0 °C (31 - 33 °F) throughout the day. On average each year, Fairfield experiences 69 days above 25 °C (77.0 °F) and 93 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, Washington, 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 12°C
(53°F)		 15°C
(60°F)		 19°C
(67°F)		 28°C
(83°F)		 31°C
(88°F)		 44°C
(111°F)		 41°C
(106°F)		 40°C
(104°F)		 35°C
(95°F)		 28°C
(82°F)		 16°C
(61°F)		 16°C
(62°F)
Mean maximum 8°C
(47°F)		 11°C
(52°F)		 16°C
(61°F)		 22°C
(72°F)		 28°C
(83°F)		 32°C
(89°F)		 37°C
(99°F)		 38°C
(101°F)		 32°C
(90°F)		 22°C
(72°F)		 15°C
(59°F)		 11°C
(51°F)
Average high 2°C
(36°F)		 3°C
(38°F)		 9°C
(49°F)		 14°C
(57°F)		 20°C
(67°F)		 24°C
(76°F)		 30°C
(87°F)		 30°C
(86°F)		 23°C
(74°F)		 14°C
(57°F)		 7°C
(45°F)		 3°C
(37°F)
Daily mean -0°C
(32°F)		 -1°C
(31°F)		 4°C
(40°F)		 8°C
(47°F)		 14°C
(57°F)		 19°C
(66°F)		 23°C
(74°F)		 23°C
(73°F)		 17°C
(62°F)		 9°C
(48°F)		 4°C
(39°F)		 0°C
(33°F)
Average low -3°C
(27°F)		 -4°C
(25°F)		 -0°C
(32°F)		 3°C
(38°F)		 8°C
(47°F)		 12°C
(54°F)		 15°C
(60°F)		 15°C
(60°F)		 11°C
(52°F)		 4°C
(40°F)		 1°C
(34°F)		 -2°C
(28°F)
Mean minimum -13°C
(9°F)		 -14°C
(8°F)		 -8°C
(18°F)		 -3°C
(27°F)		 2°C
(37°F)		 7°C
(45°F)		 11°C
(52°F)		 10°C
(50°F)		 5°C
(40°F)		 -5°C
(24°F)		 -6°C
(21°F)		 -10°C
(14°F)
Minimum -21°C
(-5°F)		 -18°C
(1°F)		 -15°C
(6°F)		 -6°C
(22°F)		 0°C
(33°F)		 5°C
(42°F)		 10°C
(50°F)		 8°C
(46°F)		 2°C
(35°F)		 -13°C
(10°F)		 -8°C
(18°F)		 -17°C
(2°F)

Compare climate in Fairfield with other places

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

Monthly average precipitation in Fairfield, Washington, United States §

Fairfield usually has the most precipitation in January, November and December, with an average of 13 rainy days and 81 mm (3.2 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, Washington, 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) 76 (3.0) 75 (3.0) 63 (2.5) 57 (2.2) 53 (2.1) 24 (1.0) 3 (0.1) 9 (0.3) 32 (1.2) 61 (2.4) 89 (3.5) 78 (3.1)
Average precipitation days (≥ 1 mm) 13 14 12 12 8 5 0 2 4 9 14 13

Monthly sunshine hours in Fairfield, Washington, United States §

The sunniest months in Fairfield are June, July and August, when the sun shines an average of 12 hours 11 minutes a day.Least sunny months in Fairfield: January, February and December receive an average of 3 hours 38 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Fairfield, Washington, 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 90 139 218 267 333 355 412 353 285 227 141 101
Mean daily daylight hours 8h 56m 10h 17m 11h 57m 13h 39m 15h 7m 15h 52m 15h 27m 14h 8m 12h 29m 10h 47m 9h 17m 8h 30m

Solar UV radiation in Fairfield, Washington, 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 9 - 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 Fairfield UV Index data.

Average daily maximum UV levels by month for Fairfield, Washington, 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 5 6 8 9 10 9 7 5 3 2