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Monthly climate in Castleton, Vermont, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Castleton features a humid continental climate (Dfb).Temperatures typically range between -5 °C (23 °F) and 22 °C (72 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 37 °C (98 °F).The average annual precipitation amounts to about 1122 mm (44.2 inches) and receives 136 rainy days on the 1 mm (0.04 inches) threshold annually.Castleton enjoys an average of 2765 hours of sunshine throughout the year, and daylight varies from 8 hours 59 minutes to 15 hours 21 minutes per day.

Monthly average temperatures in Castleton, Vermont, United States §

The warmest months in Castleton are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (66 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to -2 °C (23 - 28 °F) throughout the day. On average each year, Castleton experiences 60 days above 25 °C (77.0 °F) and 127 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castleton, 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 16°C
(61°F)		 21°C
(69°F)		 21°C
(69°F)		 26°C
(79°F)		 33°C
(91°F)		 34°C
(94°F)		 37°C
(98°F)		 33°C
(92°F)		 32°C
(91°F)		 25°C
(78°F)		 22°C
(72°F)		 15°C
(59°F)
Mean maximum 10°C
(50°F)		 13°C
(55°F)		 17°C
(63°F)		 22°C
(72°F)		 30°C
(87°F)		 31°C
(88°F)		 33°C
(91°F)		 32°C
(89°F)		 30°C
(86°F)		 24°C
(75°F)		 18°C
(64°F)		 12°C
(54°F)
Average high -1°C
(30°F)		 1°C
(34°F)		 5°C
(41°F)		 12°C
(54°F)		 19°C
(67°F)		 24°C
(76°F)		 27°C
(81°F)		 26°C
(80°F)		 23°C
(73°F)		 15°C
(60°F)		 6°C
(44°F)		 1°C
(34°F)
Daily mean -5°C
(23°F)		 -4°C
(26°F)		 0°C
(32°F)		 7°C
(45°F)		 14°C
(57°F)		 19°C
(66°F)		 22°C
(72°F)		 21°C
(70°F)		 17°C
(63°F)		 11°C
(51°F)		 2°C
(37°F)		 -2°C
(28°F)
Average low -10°C
(15°F)		 -9°C
(17°F)		 -5°C
(24°F)		 3°C
(37°F)		 9°C
(48°F)		 13°C
(56°F)		 17°C
(63°F)		 16°C
(61°F)		 12°C
(54°F)		 6°C
(44°F)		 -2°C
(29°F)		 -6°C
(21°F)
Mean minimum -24°C
(-10°F)		 -21°C
(-6°F)		 -17°C
(2°F)		 -4°C
(25°F)		 1°C
(35°F)		 8°C
(47°F)		 11°C
(53°F)		 10°C
(50°F)		 4°C
(39°F)		 -2°C
(28°F)		 -13°C
(9°F)		 -19°C
(-2°F)
Minimum -30°C
(-22°F)		 -24°C
(-11°F)		 -19°C
(-3°F)		 -6°C
(22°F)		 -1°C
(31°F)		 4°C
(40°F)		 9°C
(49°F)		 7°C
(45°F)		 -1°C
(30°F)		 -4°C
(25°F)		 -20°C
(-4°F)		 -28°C
(-18°F)

Compare climate in Castleton with other places

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

Monthly average precipitation in Castleton, Vermont, United States §

Castleton usually has the most precipitation in April, July and October, with an average of 13 rainy days and 124 mm (4.9 inches) of precipitation per month.The driest months in Castleton are January, March and September. On average, 74 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castleton, 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) 79 (3.1) 86 (3.4) 74 (2.9) 118 (4.7) 87 (3.4) 80 (3.2) 114 (4.5) 83 (3.3) 69 (2.7) 139 (5.5) 102 (4.0) 90 (3.5)
Average precipitation days (≥ 1 mm) 10 12 10 14 13 12 12 10 7 13 12 11

Monthly sunshine hours in Castleton, Vermont, United States §

The sunniest months in Castleton are June, July and August, when the sun shines an average of 10 hours 43 minutes a day.Least sunny months in Castleton: January, February and December receive an average of 4 hours 29 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castleton, 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 115 154 226 223 270 322 331 332 289 202 158 137
Mean daily daylight hours 9h 21m 10h 30m 11h 58m 13h 27m 14h 43m 15h 21m 15h 0m 13h 52m 12h 26m 10h 57m 9h 39m 8h 59m

Solar UV radiation in Castleton, Vermont, United States §

Castleton 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 Castleton UV Index data.

Average daily maximum UV levels by month for Castleton, 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) 3 4 5 8 9 10 9 9 7 5 3 2