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Monthly climate in Charlestown, New Hampshire, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Charlestown features a humid continental climate (Dfb).Temperatures typically range between -5 °C (23 °F) and 22 °C (71 °F) through the year, but rarely can drop to -28 °C (-18 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 1169 mm (46.0 inches) and receives 135 rainy days on the 1 mm (0.04 inches) threshold annually.Charlestown enjoys an average of 2869 hours of sunshine throughout the year, and daylight varies from 9 hours 1 minutes to 15 hours 18 minutes per day.

Monthly average temperatures in Charlestown, New Hampshire, United States §

The warmest months in Charlestown are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (66 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to -3 °C (23 - 27 °F) throughout the day. On average each year, Charlestown experiences 56 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 Charlestown, New Hampshire, 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 15°C
(60°F)		 22°C
(71°F)		 20°C
(69°F)		 26°C
(80°F)		 32°C
(90°F)		 35°C
(95°F)		 37°C
(99°F)		 34°C
(93°F)		 31°C
(89°F)		 26°C
(79°F)		 23°C
(73°F)		 14°C
(58°F)
Mean maximum 10°C
(50°F)		 13°C
(56°F)		 17°C
(63°F)		 21°C
(71°F)		 30°C
(87°F)		 31°C
(88°F)		 33°C
(92°F)		 32°C
(90°F)		 30°C
(86°F)		 24°C
(75°F)		 18°C
(65°F)		 12°C
(55°F)
Average high -1°C
(31°F)		 1°C
(34°F)		 5°C
(41°F)		 11°C
(53°F)		 19°C
(66°F)		 24°C
(76°F)		 27°C
(81°F)		 26°C
(79°F)		 22°C
(72°F)		 15°C
(59°F)		 7°C
(44°F)		 1°C
(34°F)
Daily mean -5°C
(23°F)		 -4°C
(26°F)		 -0°C
(32°F)		 7°C
(44°F)		 13°C
(56°F)		 19°C
(66°F)		 22°C
(71°F)		 20°C
(69°F)		 17°C
(62°F)		 10°C
(51°F)		 2°C
(36°F)		 -3°C
(27°F)
Average low -10°C
(15°F)		 -9°C
(17°F)		 -5°C
(24°F)		 2°C
(36°F)		 8°C
(46°F)		 13°C
(55°F)		 16°C
(61°F)		 15°C
(60°F)		 11°C
(52°F)		 6°C
(43°F)		 -2°C
(28°F)		 -7°C
(20°F)
Mean minimum -22°C
(-8°F)		 -21°C
(-5°F)		 -17°C
(1°F)		 -5°C
(24°F)		 1°C
(34°F)		 7°C
(46°F)		 11°C
(51°F)		 8°C
(47°F)		 3°C
(37°F)		 -3°C
(27°F)		 -14°C
(8°F)		 -21°C
(-6°F)
Minimum -28°C
(-18°F)		 -24°C
(-11°F)		 -20°C
(-5°F)		 -7°C
(20°F)		 -1°C
(31°F)		 1°C
(34°F)		 9°C
(48°F)		 5°C
(42°F)		 -1°C
(31°F)		 -6°C
(22°F)		 -24°C
(-12°F)		 -25°C
(-13°F)

Compare climate in Charlestown with other places

Compare temperature, precipitation, sunshine, UV index in Charlestown, New Hampshire, United States with other places around the world.

Monthly average precipitation in Charlestown, New Hampshire, United States §

Charlestown usually has the most precipitation in April, July and October, with an average of 13 rainy days and 130 mm (5.1 inches) of precipitation per month.The driest months in Charlestown are January, March and September. On average, 75 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Charlestown, New Hampshire, 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) 72 (2.9) 85 (3.3) 73 (2.9) 122 (4.8) 85 (3.3) 90 (3.5) 126 (5.0) 92 (3.6) 79 (3.1) 142 (5.6) 101 (4.0) 104 (4.1)
Average precipitation days (≥ 1 mm) 9 11 10 13 12 12 13 11 9 13 12 10

Monthly sunshine hours in Charlestown, New Hampshire, United States §

The sunniest months in Charlestown are June, July and August, when the sun shines an average of 10 hours 40 minutes a day.Least sunny months in Charlestown: January, February and December receive an average of 5 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Charlestown, New Hampshire, 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 138 172 241 226 272 321 327 333 284 205 180 164
Mean daily daylight hours 9h 23m 10h 31m 11h 57m 13h 26m 14h 41m 15h 18m 14h 58m 13h 51m 12h 26m 10h 58m 9h 41m 9h 1m

Solar UV radiation in Charlestown, New Hampshire, United States §

Charlestown 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 Charlestown UV Index data.

Average daily maximum UV levels by month for Charlestown, New Hampshire, 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 6 8 9 10 9 9 7 6 3 2