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Monthly climate in Plymouth, New Hampshire, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Plymouth features a humid continental climate (Dfb).Temperatures typically range between -6 °C (21 °F) and 21 °C (70 °F) through the year, but rarely can drop to -29 °C (-20 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1205 mm (47.4 inches) and receives 132 rainy days on the 1 mm (0.04 inches) threshold annually.Plymouth enjoys an average of 2865 hours of sunshine throughout the year, and daylight varies from 8 hours 57 minutes to 15 hours 22 minutes per day.

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

The warmest months in Plymouth are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (65 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -3 °C (21 - 26 °F) throughout the day. On average each year, Plymouth experiences 52 days above 25 °C (77.0 °F) and 132 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Plymouth, 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 14°C
(58°F)		 19°C
(67°F)		 19°C
(66°F)		 27°C
(80°F)		 33°C
(92°F)		 34°C
(94°F)		 35°C
(95°F)		 34°C
(93°F)		 31°C
(88°F)		 26°C
(79°F)		 22°C
(72°F)		 14°C
(58°F)
Mean maximum 9°C
(48°F)		 12°C
(54°F)		 14°C
(57°F)		 21°C
(69°F)		 31°C
(87°F)		 31°C
(87°F)		 32°C
(90°F)		 32°C
(90°F)		 29°C
(84°F)		 23°C
(74°F)		 17°C
(63°F)		 12°C
(54°F)
Average high -2°C
(29°F)		 -0°C
(32°F)		 4°C
(39°F)		 11°C
(51°F)		 18°C
(65°F)		 24°C
(75°F)		 26°C
(80°F)		 25°C
(78°F)		 22°C
(71°F)		 14°C
(58°F)		 6°C
(43°F)		 0°C
(33°F)
Daily mean -6°C
(21°F)		 -5°C
(24°F)		 -1°C
(30°F)		 6°C
(43°F)		 13°C
(55°F)		 18°C
(65°F)		 21°C
(70°F)		 20°C
(69°F)		 16°C
(62°F)		 10°C
(50°F)		 2°C
(36°F)		 -3°C
(26°F)
Average low -11°C
(13°F)		 -10°C
(15°F)		 -6°C
(22°F)		 2°C
(35°F)		 7°C
(45°F)		 12°C
(54°F)		 16°C
(62°F)		 15°C
(60°F)		 12°C
(53°F)		 6°C
(43°F)		 -2°C
(29°F)		 -7°C
(19°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)		 9°C
(48°F)		 4°C
(39°F)		 -1°C
(30°F)		 -12°C
(11°F)		 -20°C
(-4°F)
Minimum -29°C
(-20°F)		 -25°C
(-12°F)		 -19°C
(-2°F)		 -7°C
(20°F)		 -1°C
(31°F)		 1°C
(34°F)		 9°C
(48°F)		 8°C
(46°F)		 -1°C
(31°F)		 -3°C
(27°F)		 -17°C
(2°F)		 -25°C
(-14°F)

Compare climate in Plymouth with other places

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

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

Plymouth usually has the most precipitation in April, July and October, with an average of 13 rainy days and 133 mm (5.2 inches) of precipitation per month.The driest months in Plymouth are January, March and September. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Plymouth, 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) 75 (3.0) 83 (3.3) 73 (2.9) 129 (5.1) 86 (3.4) 100 (3.9) 137 (5.4) 92 (3.6) 66 (2.6) 134 (5.3) 115 (4.5) 115 (4.5)
Average precipitation days (≥ 1 mm) 9 11 8 14 12 11 13 11 8 13 12 10

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

The sunniest months in Plymouth are June, July and August, when the sun shines an average of 10 hours 35 minutes a day.Least sunny months in Plymouth: January, February and December receive an average of 5 hours 16 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Plymouth, 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 139 172 246 226 272 320 322 330 286 200 178 167
Mean daily daylight hours 9h 19m 10h 29m 11h 57m 13h 28m 14h 44m 15h 22m 15h 2m 13h 53m 12h 27m 10h 57m 9h 38m 8h 57m

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

Plymouth 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 Plymouth UV Index data.

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