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Monthly climate in Union, West Virginia, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Union features a oceanic climate (Cfb).Temperatures typically range between 1 °C (34 °F) and 23 °C (73 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 1158 mm (45.6 inches) and receives 134 rainy days on the 1 mm (0.04 inches) threshold annually.Union enjoys an average of 3032 hours of sunshine throughout the year, and daylight varies from 9 hours 35 minutes to 14 hours 42 minutes per day.

Monthly average temperatures in Union, West Virginia, United States §

The warmest months in Union are June, July and August, with daily mean temperatures ranging from 20 to 23 °C (69 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 4 °C (34 - 40 °F) throughout the day. On average each year, Union experiences 89 days above 25 °C (77.0 °F) and 85 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, West Virginia, 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 20°C
(68°F)		 24°C
(75°F)		 29°C
(85°F)		 29°C
(85°F)		 30°C
(87°F)		 32°C
(89°F)		 34°C
(93°F)		 34°C
(93°F)		 33°C
(92°F)		 32°C
(90°F)		 23°C
(74°F)		 20°C
(67°F)
Mean maximum 17°C
(62°F)		 20°C
(69°F)		 24°C
(75°F)		 27°C
(81°F)		 29°C
(84°F)		 30°C
(86°F)		 32°C
(90°F)		 32°C
(89°F)		 30°C
(86°F)		 28°C
(82°F)		 22°C
(72°F)		 17°C
(64°F)
Average high 6°C
(42°F)		 9°C
(49°F)		 12°C
(54°F)		 18°C
(64°F)		 22°C
(72°F)		 25°C
(78°F)		 28°C
(83°F)		 27°C
(81°F)		 25°C
(77°F)		 20°C
(67°F)		 12°C
(53°F)		 8°C
(47°F)
Daily mean 1°C
(34°F)		 4°C
(40°F)		 7°C
(44°F)		 12°C
(53°F)		 17°C
(62°F)		 20°C
(69°F)		 23°C
(73°F)		 22°C
(72°F)		 19°C
(67°F)		 14°C
(57°F)		 6°C
(43°F)		 3°C
(39°F)
Average low -3°C
(27°F)		 -1°C
(31°F)		 2°C
(35°F)		 6°C
(43°F)		 12°C
(53°F)		 15°C
(60°F)		 18°C
(64°F)		 17°C
(63°F)		 14°C
(58°F)		 9°C
(48°F)		 1°C
(34°F)		 -1°C
(31°F)
Mean minimum -15°C
(5°F)		 -12°C
(10°F)		 -9°C
(17°F)		 -3°C
(26°F)		 2°C
(36°F)		 9°C
(49°F)		 12°C
(54°F)		 12°C
(55°F)		 7°C
(45°F)		 -0°C
(32°F)		 -7°C
(20°F)		 -12°C
(11°F)
Minimum -20°C
(-4°F)		 -17°C
(2°F)		 -13°C
(10°F)		 -5°C
(23°F)		 -2°C
(29°F)		 7°C
(44°F)		 11°C
(53°F)		 11°C
(51°F)		 3°C
(38°F)		 -3°C
(27°F)		 -11°C
(12°F)		 -17°C
(2°F)

Compare climate in Union with other places

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

Monthly average precipitation in Union, West Virginia, United States §

Union usually has the most precipitation in February, April and May, with an average of 12 rainy days and 123 mm (4.8 inches) of precipitation per month.The driest months in Union are January, July and November. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Union, West Virginia, 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) 74 (2.9) 124 (4.9) 92 (3.6) 113 (4.5) 131 (5.2) 93 (3.7) 69 (2.7) 88 (3.5) 101 (4.0) 108 (4.2) 70 (2.7) 95 (3.7)
Average precipitation days (≥ 1 mm) 10 13 13 12 13 12 11 13 10 10 8 9

Monthly sunshine hours in Union, West Virginia, United States §

The sunniest months in Union are June, July and August, when the sun shines an average of 10 hours 46 minutes a day.Least sunny months in Union: January, February and December receive an average of 5 hours 19 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Union, West Virginia, 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 140 169 245 258 293 315 357 318 282 255 220 175
Mean daily daylight hours 9h 53m 10h 48m 11h 59m 13h 11m 14h 12m 14h 42m 14h 25m 13h 31m 12h 22m 11h 10m 10h 7m 9h 35m

Solar UV radiation in Union, West Virginia, United States §

Union 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 Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Union UV Index data.

Average daily maximum UV levels by month for Union, West Virginia, 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 6 8 10 11 11 11 10 9 7 5 3