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Monthly climate in Williamstown, Kentucky, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Williamstown features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (35 °F) and 25 °C (77 °F) through the year, but rarely can drop to -22 °C (-8 °F) or can rise to as high as 35 °C (96 °F).The average annual precipitation amounts to about 1396 mm (55.0 inches) and receives 142 rainy days on the 1 mm (0.04 inches) threshold annually.Williamstown enjoys an average of 2848 hours of sunshine throughout the year, and daylight varies from 9 hours 29 minutes to 14 hours 48 minutes per day.

Monthly average temperatures in Williamstown, Kentucky, United States §

The warmest months in Williamstown are June, July and August, with daily mean temperatures ranging from 23 to 25 °C (73 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 4 °C (35 - 40 °F) throughout the day. On average each year, Williamstown experiences 112 days above 25 °C (77.0 °F) and 68 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Williamstown, 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 21°C
(69°F)		 26°C
(79°F)		 27°C
(81°F)		 29°C
(85°F)		 32°C
(90°F)		 33°C
(92°F)		 35°C
(94°F)		 34°C
(94°F)		 35°C
(96°F)		 34°C
(94°F)		 27°C
(80°F)		 20°C
(68°F)
Mean maximum 17°C
(63°F)		 21°C
(69°F)		 24°C
(75°F)		 28°C
(83°F)		 31°C
(88°F)		 32°C
(91°F)		 33°C
(93°F)		 33°C
(92°F)		 33°C
(91°F)		 30°C
(86°F)		 22°C
(71°F)		 19°C
(66°F)
Average high 5°C
(41°F)		 8°C
(47°F)		 13°C
(56°F)		 18°C
(65°F)		 24°C
(75°F)		 28°C
(82°F)		 30°C
(86°F)		 29°C
(84°F)		 27°C
(81°F)		 21°C
(69°F)		 12°C
(53°F)		 9°C
(48°F)
Daily mean 1°C
(35°F)		 4°C
(39°F)		 8°C
(46°F)		 13°C
(55°F)		 19°C
(66°F)		 23°C
(73°F)		 25°C
(77°F)		 24°C
(75°F)		 21°C
(71°F)		 15°C
(60°F)		 7°C
(45°F)		 4°C
(40°F)
Average low -2°C
(28°F)		 -1°C
(31°F)		 3°C
(38°F)		 8°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
(37°F)		 0°C
(33°F)
Mean minimum -15°C
(5°F)		 -12°C
(10°F)		 -7°C
(20°F)		 -2°C
(29°F)		 4°C
(40°F)		 13°C
(55°F)		 16°C
(61°F)		 14°C
(58°F)		 9°C
(49°F)		 2°C
(35°F)		 -5°C
(23°F)		 -9°C
(17°F)
Minimum -22°C
(-8°F)		 -18°C
(0°F)		 -12°C
(10°F)		 -3°C
(27°F)		 0°C
(32°F)		 9°C
(49°F)		 15°C
(59°F)		 13°C
(56°F)		 7°C
(45°F)		 -0°C
(32°F)		 -11°C
(13°F)		 -14°C
(7°F)

Compare climate in Williamstown with other places

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

Monthly average precipitation in Williamstown, Kentucky, United States §

Williamstown usually has the most precipitation in March, April and June, with an average of 12 rainy days and 145 mm (5.7 inches) of precipitation per month.The driest months in Williamstown are January, August and November. On average, 87 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Williamstown, 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) 82 (3.2) 122 (4.8) 133 (5.2) 135 (5.3) 131 (5.2) 167 (6.6) 119 (4.7) 88 (3.5) 107 (4.2) 104 (4.1) 91 (3.6) 116 (4.6)
Average precipitation days (≥ 1 mm) 10 14 13 12 15 13 12 13 8 12 9 11

Monthly sunshine hours in Williamstown, Kentucky, United States §

The sunniest months in Williamstown are June, July and August, when the sun shines an average of 10 hours 33 minutes a day.Least sunny months in Williamstown: January, February and December receive an average of 4 hours 41 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Williamstown, 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 121 147 219 232 281 312 344 313 277 243 194 158
Mean daily daylight hours 9h 47m 10h 45m 11h 58m 13h 14m 14h 17m 14h 48m 14h 31m 13h 35m 12h 23m 11h 8m 10h 2m 9h 29m

Solar UV radiation in Williamstown, Kentucky, United States §

Williamstown 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 Williamstown UV Index data.

Average daily maximum UV levels by month for Williamstown, 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 7 9 10 10 10 9 8 6 4 3