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Monthly climate in Union, Kentucky, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Union features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (34 °F) and 25 °C (78 °F) through the year, but rarely can drop to -21 °C (-5 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1316 mm (51.8 inches) and receives 136 rainy days on the 1 mm (0.04 inches) threshold annually.Union enjoys an average of 2879 hours of sunshine throughout the year, and daylight varies from 9 hours 27 minutes to 14 hours 50 minutes per day.

Monthly average temperatures in Union, Kentucky, United States §

The warmest months in Union are June, July and August, with daily mean temperatures ranging from 23 to 25 °C (74 - 78 °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 - 39 °F) throughout the day. On average each year, Union experiences 110 days above 25 °C (77.0 °F) and 71 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, Kentucky, 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
(69°F)		 26°C
(79°F)		 26°C
(80°F)		 29°C
(85°F)		 33°C
(91°F)		 34°C
(93°F)		 35°C
(95°F)		 34°C
(93°F)		 35°C
(95°F)		 34°C
(94°F)		 27°C
(80°F)		 20°C
(68°F)
Mean maximum 17°C
(62°F)		 20°C
(68°F)		 23°C
(74°F)		 28°C
(82°F)		 31°C
(88°F)		 33°C
(91°F)		 33°C
(92°F)		 33°C
(92°F)		 33°C
(91°F)		 30°C
(86°F)		 21°C
(70°F)		 18°C
(65°F)
Average high 5°C
(41°F)		 8°C
(46°F)		 13°C
(55°F)		 18°C
(64°F)		 24°C
(75°F)		 28°C
(82°F)		 30°C
(86°F)		 29°C
(84°F)		 27°C
(81°F)		 20°C
(69°F)		 11°C
(53°F)		 8°C
(47°F)
Daily mean 1°C
(34°F)		 3°C
(38°F)		 7°C
(46°F)		 12°C
(55°F)		 19°C
(66°F)		 23°C
(74°F)		 25°C
(78°F)		 24°C
(75°F)		 21°C
(71°F)		 15°C
(59°F)		 7°C
(44°F)		 4°C
(39°F)
Average low -3°C
(28°F)		 -1°C
(30°F)		 3°C
(37°F)		 7°C
(46°F)		 14°C
(58°F)		 18°C
(65°F)		 21°C
(70°F)		 20°C
(67°F)		 17°C
(62°F)		 10°C
(51°F)		 2°C
(36°F)		 -0°C
(32°F)
Mean minimum -16°C
(3°F)		 -13°C
(9°F)		 -8°C
(18°F)		 -2°C
(29°F)		 4°C
(40°F)		 13°C
(56°F)		 16°C
(62°F)		 14°C
(58°F)		 9°C
(49°F)		 2°C
(36°F)		 -6°C
(22°F)		 -9°C
(16°F)
Minimum -21°C
(-5°F)		 -18°C
(-0°F)		 -15°C
(5°F)		 -3°C
(27°F)		 0°C
(33°F)		 10°C
(50°F)		 15°C
(60°F)		 13°C
(56°F)		 7°C
(45°F)		 1°C
(33°F)		 -13°C
(8°F)		 -15°C
(5°F)

Compare climate in Union with other places

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

Monthly average precipitation in Union, Kentucky, United States §

Union usually has the most precipitation in March, May and June, with an average of 13 rainy days and 135 mm (5.3 inches) of precipitation per month.The driest months in Union are January, September and November. On average, 86 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Union, Kentucky, 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) 80 (3.1) 110 (4.3) 135 (5.3) 125 (4.9) 126 (4.9) 146 (5.7) 113 (4.5) 95 (3.7) 87 (3.4) 98 (3.9) 93 (3.7) 109 (4.3)
Average precipitation days (≥ 1 mm) 9 13 13 12 15 12 12 12 7 12 9 10

Monthly sunshine hours in Union, Kentucky, United States §

The sunniest months in Union are June, July and August, when the sun shines an average of 10 hours 42 minutes a day.Least sunny months in Union: January, February and December receive an average of 4 hours 46 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Union, Kentucky, 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 121 151 221 234 282 319 346 319 280 244 196 161
Mean daily daylight hours 9h 46m 10h 44m 11h 58m 13h 15m 14h 19m 14h 50m 14h 33m 13h 36m 12h 23m 11h 7m 10h 1m 9h 27m

Solar UV radiation in Union, Kentucky, 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 10 - 10, which corresponds to the Very High 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 Union UV Index data.

Average daily maximum UV levels by month for Union, Kentucky, 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 6 9 10 10 10 9 8 6 4 3