nomadseason

Monthly climate in Williston, Vermont, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Williston features a humid continental climate (Dfb).Temperatures typically range between -7 °C (20 °F) and 21 °C (71 °F) through the year, but rarely can drop to -30 °C (-23 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1148 mm (45.2 inches) and receives 157 rainy days on the 1 mm (0.04 inches) threshold annually.Williston enjoys an average of 2682 hours of sunshine throughout the year, and daylight varies from 8 hours 52 minutes to 15 hours 28 minutes per day.

Monthly average temperatures in Williston, Vermont, United States §

The warmest months in Williston are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (65 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -7 to -3 °C (20 - 26 °F) throughout the day. On average each year, Williston experiences 52 days above 25 °C (77.0 °F) and 131 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Williston, Vermont, 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)		 17°C
(63°F)		 21°C
(70°F)		 25°C
(77°F)		 35°C
(95°F)		 34°C
(94°F)		 34°C
(94°F)		 33°C
(91°F)		 32°C
(89°F)		 25°C
(78°F)		 22°C
(72°F)		 15°C
(59°F)
Mean maximum 7°C
(46°F)		 11°C
(52°F)		 16°C
(60°F)		 21°C
(71°F)		 30°C
(87°F)		 30°C
(87°F)		 31°C
(89°F)		 31°C
(89°F)		 29°C
(85°F)		 23°C
(74°F)		 17°C
(62°F)		 11°C
(53°F)
Average high -3°C
(27°F)		 -1°C
(31°F)		 3°C
(38°F)		 11°C
(52°F)		 19°C
(66°F)		 24°C
(75°F)		 26°C
(80°F)		 26°C
(78°F)		 22°C
(71°F)		 14°C
(58°F)		 5°C
(42°F)		 -0°C
(32°F)
Daily mean -7°C
(20°F)		 -5°C
(23°F)		 -1°C
(30°F)		 6°C
(43°F)		 13°C
(56°F)		 18°C
(65°F)		 21°C
(71°F)		 20°C
(69°F)		 16°C
(62°F)		 10°C
(50°F)		 2°C
(35°F)		 -3°C
(26°F)
Average low -11°C
(13°F)		 -10°C
(14°F)		 -6°C
(22°F)		 2°C
(36°F)		 8°C
(46°F)		 13°C
(55°F)		 17°C
(62°F)		 16°C
(61°F)		 12°C
(53°F)		 6°C
(43°F)		 -2°C
(29°F)		 -7°C
(20°F)
Mean minimum -23°C
(-10°F)		 -22°C
(-8°F)		 -18°C
(-1°F)		 -5°C
(24°F)		 1°C
(33°F)		 7°C
(45°F)		 10°C
(51°F)		 9°C
(49°F)		 3°C
(38°F)		 -2°C
(29°F)		 -13°C
(8°F)		 -20°C
(-4°F)
Minimum -30°C
(-23°F)		 -26°C
(-15°F)		 -21°C
(-6°F)		 -8°C
(18°F)		 -1°C
(31°F)		 1°C
(34°F)		 9°C
(48°F)		 7°C
(46°F)		 -0°C
(32°F)		 -4°C
(25°F)		 -18°C
(0°F)		 -26°C
(-14°F)

Compare climate in Williston with other places

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

Monthly average precipitation in Williston, Vermont, United States §

Williston usually has the most precipitation in April, October and November, with an average of 15 rainy days and 124 mm (4.9 inches) of precipitation per month.The driest months in Williston are March, September and December. On average, 76 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Williston, Vermont, 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) 84 (3.3) 81 (3.2) 77 (3.0) 109 (4.3) 91 (3.6) 97 (3.8) 108 (4.2) 87 (3.4) 71 (2.8) 152 (6.0) 112 (4.4) 80 (3.2)
Average precipitation days (≥ 1 mm) 13 14 12 15 12 11 13 13 9 15 15 15

Monthly sunshine hours in Williston, Vermont, United States §

The sunniest months in Williston are June, July and August, when the sun shines an average of 10 hours 40 minutes a day.Least sunny months in Williston: January, November and December receive an average of 4 hours 3 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Williston, Vermont, 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 106 147 221 214 269 318 334 329 283 190 137 129
Mean daily daylight hours 9h 15m 10h 27m 11h 57m 13h 29m 14h 48m 15h 28m 15h 6m 13h 56m 12h 27m 10h 55m 9h 34m 8h 52m

Solar UV radiation in Williston, Vermont, United States §

Williston experiences the highest level of ultraviolet (UV) radiation in May, June 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 Williston UV Index data.

Average daily maximum UV levels by month for Williston, Vermont, 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 8 9 10 9 9 7 5 3 2