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Monthly climate in Westford, Massachusetts, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Westford features a humid continental climate (Dfb).Temperatures typically range between -1 °C (30 °F) and 23 °C (74 °F) through the year, but rarely can drop to -22 °C (-7 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 1180 mm (46.4 inches) and receives 126 rainy days on the 1 mm (0.04 inches) threshold annually.Westford enjoys an average of 2909 hours of sunshine throughout the year, and daylight varies from 9 hours 6 minutes to 15 hours 13 minutes per day.

Monthly average temperatures in Westford, Massachusetts, United States §

The warmest months in Westford are June, July and August, with daily mean temperatures ranging from 20 to 23 °C (69 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 0 °C (30 - 33 °F) throughout the day. On average each year, Westford experiences 75 days above 25 °C (77.0 °F) and 102 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Westford, 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 20°C
(69°F)		 23°C
(73°F)		 22°C
(73°F)		 30°C
(86°F)		 34°C
(94°F)		 37°C
(99°F)		 37°C
(98°F)		 35°C
(96°F)		 35°C
(95°F)		 28°C
(83°F)		 24°C
(76°F)		 17°C
(63°F)
Mean maximum 14°C
(57°F)		 18°C
(64°F)		 19°C
(67°F)		 23°C
(74°F)		 32°C
(89°F)		 33°C
(92°F)		 35°C
(96°F)		 34°C
(94°F)		 32°C
(89°F)		 26°C
(79°F)		 22°C
(71°F)		 16°C
(60°F)
Average high 3°C
(37°F)		 5°C
(41°F)		 8°C
(46°F)		 14°C
(57°F)		 20°C
(68°F)		 26°C
(79°F)		 29°C
(84°F)		 28°C
(83°F)		 24°C
(76°F)		 18°C
(64°F)		 10°C
(50°F)		 4°C
(40°F)
Daily mean -1°C
(30°F)		 0°C
(32°F)		 3°C
(38°F)		 9°C
(48°F)		 15°C
(59°F)		 20°C
(69°F)		 23°C
(74°F)		 23°C
(73°F)		 19°C
(66°F)		 13°C
(55°F)		 5°C
(42°F)		 0°C
(33°F)
Average low -5°C
(23°F)		 -4°C
(24°F)		 -2°C
(29°F)		 4°C
(40°F)		 10°C
(50°F)		 15°C
(59°F)		 19°C
(66°F)		 18°C
(65°F)		 14°C
(58°F)		 8°C
(48°F)		 1°C
(34°F)		 -4°C
(26°F)
Mean minimum -18°C
(1°F)		 -16°C
(4°F)		 -13°C
(9°F)		 -2°C
(28°F)		 3°C
(38°F)		 9°C
(49°F)		 14°C
(57°F)		 12°C
(54°F)		 6°C
(44°F)		 -1°C
(30°F)		 -8°C
(18°F)		 -14°C
(7°F)
Minimum -22°C
(-6°F)		 -19°C
(-2°F)		 -18°C
(-1°F)		 -4°C
(25°F)		 2°C
(35°F)		 5°C
(41°F)		 13°C
(55°F)		 9°C
(49°F)		 3°C
(38°F)		 -8°C
(17°F)		 -13°C
(8°F)		 -22°C
(-7°F)

Compare climate in Westford with other places

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

Monthly average precipitation in Westford, Massachusetts, United States §

Westford usually has the most precipitation in April, July and October, with an average of 12 rainy days and 130 mm (5.1 inches) of precipitation per month.The driest months in Westford are January, February and September. On average, 78 mm (3.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Westford, 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) 69 (2.7) 85 (3.3) 86 (3.4) 124 (4.9) 86 (3.4) 85 (3.4) 133 (5.3) 85 (3.4) 79 (3.1) 132 (5.2) 97 (3.8) 118 (4.6)
Average precipitation days (≥ 1 mm) 9 11 9 12 11 11 13 11 8 11 10 10

Monthly sunshine hours in Westford, Massachusetts, United States §

The sunniest months in Westford are June, July and August, when the sun shines an average of 10 hours 27 minutes a day.Least sunny months in Westford: January, February and December receive an average of 5 hours 36 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Westford, 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 149 184 249 230 277 318 325 318 270 209 197 177
Mean daily daylight hours 9h 27m 10h 34m 11h 57m 13h 23m 14h 36m 15h 13m 14h 53m 13h 48m 12h 25m 11h 0m 9h 45m 9h 6m

Solar UV radiation in Westford, Massachusetts, United States §

Westford 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 4. For more detailed information, check out our hourly Westford UV Index data.

Average daily maximum UV levels by month for Westford, 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 10 9 9 7 6 4 2