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Monthly climate in Northwest Harwich, Massachusetts, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Northwest Harwich features a humid subtropical climate (Cfa).Temperatures typically range between 2 °C (37 °F) and 21 °C (71 °F) through the year, but rarely can drop to -13 °C (10 °F) or can rise to as high as 26 °C (79 °F).The average annual precipitation amounts to about 1366 mm (53.8 inches) and receives 128 rainy days on the 1 mm (0.04 inches) threshold annually.Northwest Harwich enjoys an average of 2992 hours of sunshine throughout the year, and daylight varies from 9 hours 10 minutes to 15 hours 9 minutes per day.

Monthly average temperatures in Northwest Harwich, Massachusetts, United States §

The warmest months in Northwest Harwich are July, August and September, with daily mean temperatures ranging from 19 to 21 °C (66 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 2 to 3 °C (37 - 38 °F) throughout the day. On average each year, Northwest Harwich experiences 1 days above 25 °C (77.0 °F) and 37 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Northwest Harwich, 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 12°C
(54°F)		 11°C
(53°F)		 12°C
(54°F)		 14°C
(57°F)		 19°C
(66°F)		 22°C
(73°F)		 26°C
(79°F)		 26°C
(78°F)		 24°C
(75°F)		 21°C
(70°F)		 18°C
(65°F)		 15°C
(60°F)
Mean maximum 11°C
(52°F)		 10°C
(50°F)		 10°C
(51°F)		 12°C
(54°F)		 17°C
(62°F)		 20°C
(69°F)		 24°C
(76°F)		 25°C
(76°F)		 23°C
(73°F)		 20°C
(69°F)		 17°C
(62°F)		 14°C
(57°F)
Average high 5°C
(40°F)		 5°C
(41°F)		 5°C
(42°F)		 8°C
(47°F)		 12°C
(54°F)		 17°C
(63°F)		 21°C
(71°F)		 22°C
(72°F)		 20°C
(68°F)		 16°C
(61°F)		 11°C
(52°F)		 7°C
(44°F)
Daily mean 2°C
(37°F)		 2°C
(37°F)		 3°C
(38°F)		 7°C
(45°F)		 11°C
(52°F)		 16°C
(61°F)		 20°C
(69°F)		 21°C
(71°F)		 19°C
(66°F)		 15°C
(59°F)		 9°C
(49°F)		 5°C
(41°F)
Average low 0°C
(33°F)		 1°C
(33°F)		 2°C
(35°F)		 6°C
(43°F)		 10°C
(50°F)		 15°C
(60°F)		 20°C
(67°F)		 21°C
(69°F)		 18°C
(64°F)		 14°C
(57°F)		 7°C
(45°F)		 3°C
(37°F)
Mean minimum -9°C
(16°F)		 -8°C
(19°F)		 -6°C
(21°F)		 2°C
(36°F)		 6°C
(43°F)		 11°C
(53°F)		 17°C
(62°F)		 17°C
(63°F)		 14°C
(58°F)		 8°C
(47°F)		 -1°C
(30°F)		 -4°C
(25°F)
Minimum -13°C
(10°F)		 -11°C
(12°F)		 -8°C
(18°F)		 1°C
(33°F)		 5°C
(41°F)		 10°C
(50°F)		 16°C
(61°F)		 16°C
(61°F)		 13°C
(56°F)		 4°C
(40°F)		 -6°C
(21°F)		 -10°C
(14°F)

Compare climate in Northwest Harwich with other places

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

Monthly average precipitation in Northwest Harwich, Massachusetts, United States §

Northwest Harwich usually has the most precipitation in April, October and December, with an average of 12 rainy days and 146 mm (5.7 inches) of precipitation per month.The driest months in Northwest Harwich are June, July and August. On average, 83 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Northwest Harwich, 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) 94 (3.7) 124 (4.9) 119 (4.7) 131 (5.1) 121 (4.8) 88 (3.5) 77 (3.0) 83 (3.3) 116 (4.6) 169 (6.7) 106 (4.2) 138 (5.4)
Average precipitation days (≥ 1 mm) 10 12 11 14 12 10 8 8 10 11 10 12

Monthly sunshine hours in Northwest Harwich, Massachusetts, United States §

The sunniest months in Northwest Harwich are June, July and August, when the sun shines an average of 10 hours 51 minutes a day.Least sunny months in Northwest Harwich: January, February and December receive an average of 5 hours 12 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Northwest Harwich, 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 136 179 257 243 298 324 343 331 279 237 202 159
Mean daily daylight hours 9h 31m 10h 36m 11h 58m 13h 22m 14h 33m 15h 9m 14h 49m 13h 46m 12h 25m 11h 1m 9h 48m 9h 10m

Solar UV radiation in Northwest Harwich, Massachusetts, United States §

Northwest Harwich experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, February 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 Northwest Harwich UV Index data.

Average daily maximum UV levels by month for Northwest Harwich, 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 4 6 8 9 10 10 9 8 6 4 2