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Monthly climate in Plymouth, Massachusetts, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Plymouth features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (34 °F) and 22 °C (72 °F) through the year, but rarely can drop to -17 °C (1 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 1345 mm (53.0 inches) and receives 127 rainy days on the 1 mm (0.04 inches) threshold annually.Plymouth enjoys an average of 2980 hours of sunshine throughout the year, and daylight varies from 9 hours 8 minutes to 15 hours 11 minutes per day.

Monthly average temperatures in Plymouth, Massachusetts, United States §

The warmest months in Plymouth are July, August and September, 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 1 to 3 °C (34 - 37 °F) throughout the day. On average each year, Plymouth experiences 38 days above 25 °C (77.0 °F) and 68 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, Massachusetts, 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 18°C
(65°F)		 17°C
(62°F)		 17°C
(63°F)		 24°C
(75°F)		 28°C
(82°F)		 31°C
(87°F)		 34°C
(93°F)		 32°C
(90°F)		 31°C
(89°F)		 25°C
(78°F)		 21°C
(70°F)		 16°C
(62°F)
Mean maximum 13°C
(56°F)		 14°C
(58°F)		 15°C
(60°F)		 18°C
(65°F)		 26°C
(80°F)		 27°C
(81°F)		 31°C
(89°F)		 31°C
(87°F)		 27°C
(82°F)		 23°C
(75°F)		 20°C
(67°F)		 15°C
(59°F)
Average high 4°C
(39°F)		 5°C
(41°F)		 7°C
(45°F)		 11°C
(53°F)		 16°C
(62°F)		 22°C
(72°F)		 25°C
(78°F)		 25°C
(78°F)		 22°C
(72°F)		 17°C
(63°F)		 11°C
(52°F)		 6°C
(43°F)
Daily mean 1°C
(34°F)		 2°C
(35°F)		 3°C
(39°F)		 8°C
(47°F)		 13°C
(56°F)		 19°C
(66°F)		 22°C
(72°F)		 22°C
(72°F)		 19°C
(66°F)		 14°C
(58°F)		 8°C
(46°F)		 3°C
(37°F)
Average low -2°C
(28°F)		 -2°C
(29°F)		 0°C
(33°F)		 5°C
(42°F)		 10°C
(51°F)		 15°C
(60°F)		 19°C
(67°F)		 20°C
(68°F)		 16°C
(61°F)		 11°C
(53°F)		 4°C
(40°F)		 -0°C
(32°F)
Mean minimum -13°C
(8°F)		 -12°C
(11°F)		 -9°C
(17°F)		 0°C
(33°F)		 5°C
(41°F)		 11°C
(52°F)		 15°C
(60°F)		 15°C
(59°F)		 11°C
(52°F)		 5°C
(40°F)		 -4°C
(24°F)		 -8°C
(19°F)
Minimum -17°C
(1°F)		 -15°C
(5°F)		 -11°C
(12°F)		 -1°C
(30°F)		 3°C
(37°F)		 9°C
(49°F)		 14°C
(58°F)		 12°C
(54°F)		 10°C
(50°F)		 1°C
(34°F)		 -8°C
(17°F)		 -15°C
(6°F)

Compare climate in Plymouth with other places

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

Monthly average precipitation in Plymouth, Massachusetts, United States §

Plymouth usually has the most precipitation in April, October and December, with an average of 11 rainy days and 144 mm (5.7 inches) of precipitation per month.The driest months in Plymouth are January, June and August. On average, 87 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Plymouth, Massachusetts, 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) 89 (3.5) 109 (4.3) 114 (4.5) 137 (5.4) 105 (4.1) 95 (3.8) 110 (4.3) 75 (3.0) 111 (4.4) 168 (6.6) 104 (4.1) 128 (5.0)
Average precipitation days (≥ 1 mm) 9 12 10 13 12 10 10 10 9 11 10 11

Monthly sunshine hours in Plymouth, Massachusetts, United States §

The sunniest months in Plymouth are June, July and August, when the sun shines an average of 10 hours 41 minutes a day.Least sunny months in Plymouth: January, February and December receive an average of 5 hours 35 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Plymouth, Massachusetts, 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 148 187 252 241 289 324 336 323 276 224 202 173
Mean daily daylight hours 9h 29m 10h 34m 11h 58m 13h 23m 14h 35m 15h 11m 14h 51m 13h 47m 12h 25m 11h 0m 9h 46m 9h 8m

Solar UV radiation in Plymouth, Massachusetts, United States §

Plymouth experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 9 - 9, 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 Plymouth UV Index data.

Average daily maximum UV levels by month for Plymouth, Massachusetts, 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 9 9 9 9 7 6 4 2