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Monthly climate in Union Gap, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Union Gap features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 0 °C (33 °F) and 25 °C (77 °F) through the year, but rarely can drop to -22 °C (-7 °F) or can rise to as high as 45 °C (114 °F).The average annual precipitation amounts to about 355 mm (14.0 inches) and receives 70 rainy days on the 1 mm (0.04 inches) threshold annually.Union Gap enjoys an average of 3137 hours of sunshine throughout the year, and daylight varies from 8 hours 38 minutes to 15 hours 44 minutes per day.

Monthly average temperatures in Union Gap, Washington, United States §

The warmest months in Union Gap are June, July and August, with daily mean temperatures ranging from 21 to 25 °C (70 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 1 °C (33 - 34 °F) throughout the day. On average each year, Union Gap experiences 97 days above 25 °C (77.0 °F) and 97 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Union Gap, 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 13°C
(56°F)		 18°C
(65°F)		 20°C
(69°F)		 31°C
(87°F)		 35°C
(95°F)		 45°C
(114°F)		 43°C
(109°F)		 41°C
(107°F)		 38°C
(100°F)		 31°C
(88°F)		 20°C
(68°F)		 19°C
(66°F)
Mean maximum 11°C
(52°F)		 14°C
(57°F)		 19°C
(66°F)		 25°C
(77°F)		 32°C
(90°F)		 35°C
(96°F)		 39°C
(103°F)		 39°C
(103°F)		 35°C
(95°F)		 25°C
(78°F)		 18°C
(65°F)		 13°C
(56°F)
Average high 4°C
(39°F)		 6°C
(43°F)		 12°C
(54°F)		 17°C
(63°F)		 23°C
(74°F)		 28°C
(83°F)		 33°C
(92°F)		 32°C
(90°F)		 26°C
(79°F)		 17°C
(63°F)		 9°C
(49°F)		 4°C
(40°F)
Daily mean 0°C
(33°F)		 1°C
(34°F)		 6°C
(42°F)		 10°C
(51°F)		 16°C
(62°F)		 21°C
(70°F)		 25°C
(77°F)		 24°C
(76°F)		 18°C
(65°F)		 10°C
(51°F)		 4°C
(40°F)		 1°C
(34°F)
Average low -3°C
(27°F)		 -3°C
(26°F)		 0°C
(32°F)		 4°C
(39°F)		 9°C
(48°F)		 13°C
(55°F)		 15°C
(59°F)		 15°C
(59°F)		 10°C
(51°F)		 4°C
(39°F)		 0°C
(33°F)		 -2°C
(29°F)
Mean minimum -10°C
(14°F)		 -12°C
(11°F)		 -7°C
(20°F)		 -2°C
(28°F)		 2°C
(36°F)		 7°C
(45°F)		 10°C
(50°F)		 8°C
(47°F)		 4°C
(40°F)		 -4°C
(26°F)		 -5°C
(23°F)		 -8°C
(18°F)
Minimum -22°C
(-7°F)		 -15°C
(5°F)		 -16°C
(3°F)		 -6°C
(21°F)		 0°C
(33°F)		 5°C
(42°F)		 9°C
(49°F)		 7°C
(44°F)		 3°C
(38°F)		 -7°C
(20°F)		 -8°C
(18°F)		 -10°C
(14°F)

Compare climate in Union Gap with other places

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

Monthly average precipitation in Union Gap, Washington, United States §

Union Gap usually has the most precipitation in January, February and December, with an average of 11 rainy days and 62 mm (2.4 inches) of precipitation per month.The driest months in Union Gap are June, July and August. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Union Gap, 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) 63 (2.5) 63 (2.5) 30 (1.2) 23 (0.9) 13 (0.5) 6 (0.2) 1 (0.0) 4 (0.2) 12 (0.5) 37 (1.4) 42 (1.7) 59 (2.3)
Average precipitation days (≥ 1 mm) 12 11 8 5 3 2 0 1 3 6 8 11

Monthly sunshine hours in Union Gap, Washington, United States §

The sunniest months in Union Gap are June, July and August, when the sun shines an average of 12 hours 35 minutes a day.Least sunny months in Union Gap: January, February and December receive an average of 4 hours 19 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Union Gap, 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 100 161 240 288 355 379 413 364 292 243 166 131
Mean daily daylight hours 9h 3m 10h 20m 11h 57m 13h 36m 15h 1m 15h 44m 15h 20m 14h 4m 12h 28m 10h 50m 9h 23m 8h 38m

Solar UV radiation in Union Gap, Washington, United States §

Union Gap 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, February 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 Union Gap UV Index data.

Average daily maximum UV levels by month for Union Gap, 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 3 5 7 9 10 10 9 7 5 3 2