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Monthly climate in Wilton, Connecticut, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Wilton features a humid subtropical climate (Cfa).Temperatures typically range between 0 °C (32 °F) and 24 °C (76 °F) through the year, but rarely can drop to -18 °C (0 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1280 mm (50.4 inches) and receives 134 rainy days on the 1 mm (0.04 inches) threshold annually.Wilton enjoys an average of 2938 hours of sunshine throughout the year, and daylight varies from 9 hours 15 minutes to 15 hours 4 minutes per day.

Monthly average temperatures in Wilton, Connecticut, United States §

The warmest months in Wilton are June, July and August, with daily mean temperatures ranging from 21 to 24 °C (70 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 2 °C (32 - 37 °F) throughout the day. On average each year, Wilton experiences 73 days above 25 °C (77.0 °F) and 78 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Wilton, Connecticut, 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 19°C
(66°F)		 23°C
(73°F)		 25°C
(77°F)		 28°C
(83°F)		 33°C
(92°F)		 35°C
(95°F)		 36°C
(97°F)		 35°C
(95°F)		 33°C
(92°F)		 33°C
(91°F)		 24°C
(75°F)		 16°C
(61°F)
Mean maximum 13°C
(56°F)		 17°C
(63°F)		 20°C
(68°F)		 24°C
(75°F)		 30°C
(87°F)		 33°C
(92°F)		 35°C
(96°F)		 33°C
(91°F)		 31°C
(88°F)		 26°C
(80°F)		 21°C
(70°F)		 14°C
(58°F)
Average high 3°C
(38°F)		 5°C
(42°F)		 8°C
(47°F)		 14°C
(58°F)		 20°C
(68°F)		 25°C
(78°F)		 29°C
(84°F)		 28°C
(82°F)		 24°C
(76°F)		 18°C
(65°F)		 11°C
(52°F)		 5°C
(42°F)
Daily mean -0°C
(32°F)		 1°C
(35°F)		 4°C
(40°F)		 10°C
(50°F)		 15°C
(60°F)		 21°C
(70°F)		 24°C
(76°F)		 23°C
(75°F)		 20°C
(68°F)		 14°C
(58°F)		 7°C
(45°F)		 2°C
(37°F)
Average low -4°C
(26°F)		 -2°C
(28°F)		 0°C
(33°F)		 6°C
(42°F)		 11°C
(52°F)		 17°C
(62°F)		 21°C
(69°F)		 20°C
(68°F)		 16°C
(61°F)		 11°C
(52°F)		 3°C
(37°F)		 -1°C
(31°F)
Mean minimum -14°C
(6°F)		 -13°C
(9°F)		 -8°C
(18°F)		 -0°C
(32°F)		 5°C
(41°F)		 12°C
(53°F)		 16°C
(61°F)		 14°C
(58°F)		 9°C
(49°F)		 3°C
(38°F)		 -6°C
(22°F)		 -9°C
(16°F)
Minimum -18°C
(0°F)		 -18°C
(0°F)		 -12°C
(11°F)		 -3°C
(27°F)		 1°C
(34°F)		 8°C
(47°F)		 15°C
(59°F)		 13°C
(56°F)		 6°C
(44°F)		 1°C
(34°F)		 -11°C
(12°F)		 -13°C
(9°F)

Compare climate in Wilton with other places

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

Monthly average precipitation in Wilton, Connecticut, United States §

Wilton usually has the most precipitation in April, July and October, with an average of 12 rainy days and 130 mm (5.1 inches) of precipitation per month.The driest months in Wilton are January, March and November. On average, 84 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Wilton, Connecticut, 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) 69 (2.7) 102 (4.0) 92 (3.6) 120 (4.7) 112 (4.4) 94 (3.7) 129 (5.1) 110 (4.3) 106 (4.2) 139 (5.5) 92 (3.6) 114 (4.5)
Average precipitation days (≥ 1 mm) 8 11 10 12 13 11 14 13 10 12 9 11

Monthly sunshine hours in Wilton, Connecticut, United States §

The sunniest months in Wilton are June, July and August, when the sun shines an average of 10 hours 30 minutes a day.Least sunny months in Wilton: January, February and December receive an average of 5 hours 29 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Wilton, Connecticut, 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 149 176 252 240 275 313 338 314 278 218 206 173
Mean daily daylight hours 9h 34m 10h 38m 11h 58m 13h 20m 14h 30m 15h 4m 14h 45m 13h 43m 12h 24m 11h 3m 9h 51m 9h 15m

Solar UV radiation in Wilton, Connecticut, United States §

Wilton 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 4. For more detailed information, check out our hourly Wilton UV Index data.

Average daily maximum UV levels by month for Wilton, Connecticut, 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 8 10 10 9 9 8 6 4 2