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Monthly climate in Boston, Pennsylvania, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Boston features a humid subtropical climate (Cfa).Temperatures typically range between 0 °C (32 °F) and 24 °C (75 °F) through the year, but rarely can drop to -23 °C (-9 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 1462 mm (57.6 inches) and receives 165 rainy days on the 1 mm (0.04 inches) threshold annually.Boston enjoys an average of 2752 hours of sunshine throughout the year, and daylight varies from 9 hours 20 minutes to 14 hours 58 minutes per day.

Monthly average temperatures in Boston, Pennsylvania, United States §

The warmest months in Boston are June, July and August, with daily mean temperatures ranging from 21 to 24 °C (70 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 3 °C (32 - 37 °F) throughout the day. On average each year, Boston experiences 91 days above 25 °C (77.0 °F) and 85 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Boston, Pennsylvania, 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 22°C
(72°F)		 25°C
(77°F)		 26°C
(79°F)		 29°C
(84°F)		 31°C
(88°F)		 32°C
(91°F)		 35°C
(95°F)		 35°C
(95°F)		 33°C
(92°F)		 32°C
(89°F)		 26°C
(78°F)		 19°C
(66°F)
Mean maximum 16°C
(62°F)		 20°C
(68°F)		 23°C
(73°F)		 27°C
(81°F)		 30°C
(87°F)		 32°C
(89°F)		 32°C
(91°F)		 33°C
(91°F)		 32°C
(89°F)		 29°C
(84°F)		 22°C
(72°F)		 17°C
(63°F)
Average high 4°C
(39°F)		 7°C
(44°F)		 11°C
(51°F)		 16°C
(62°F)		 22°C
(72°F)		 26°C
(79°F)		 29°C
(84°F)		 28°C
(83°F)		 25°C
(77°F)		 19°C
(67°F)		 10°C
(51°F)		 6°C
(44°F)
Daily mean -0°C
(32°F)		 2°C
(36°F)		 6°C
(42°F)		 11°C
(52°F)		 17°C
(63°F)		 21°C
(70°F)		 24°C
(75°F)		 23°C
(73°F)		 20°C
(68°F)		 14°C
(58°F)		 6°C
(43°F)		 3°C
(37°F)
Average low -4°C
(25°F)		 -2°C
(28°F)		 1°C
(34°F)		 6°C
(43°F)		 12°C
(54°F)		 16°C
(62°F)		 19°C
(66°F)		 18°C
(65°F)		 15°C
(59°F)		 10°C
(49°F)		 1°C
(35°F)		 -1°C
(31°F)
Mean minimum -17°C
(3°F)		 -15°C
(5°F)		 -10°C
(15°F)		 -3°C
(27°F)		 2°C
(35°F)		 9°C
(49°F)		 13°C
(56°F)		 12°C
(54°F)		 8°C
(46°F)		 1°C
(34°F)		 -6°C
(22°F)		 -10°C
(14°F)
Minimum -23°C
(-9°F)		 -19°C
(-3°F)		 -15°C
(5°F)		 -5°C
(24°F)		 -2°C
(29°F)		 6°C
(42°F)		 11°C
(53°F)		 11°C
(52°F)		 4°C
(39°F)		 -1°C
(30°F)		 -9°C
(15°F)		 -15°C
(5°F)

Compare climate in Boston with other places

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

Monthly average precipitation in Boston, Pennsylvania, United States §

Boston usually has the most precipitation in May, June and July, with an average of 16 rainy days and 155 mm (6.1 inches) of precipitation per month.The driest months in Boston are January, August and November. On average, 92 mm (3.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Boston, Pennsylvania, 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) 90 (3.6) 125 (4.9) 114 (4.5) 129 (5.1) 154 (6.1) 163 (6.4) 147 (5.8) 96 (3.8) 123 (4.9) 121 (4.8) 90 (3.6) 110 (4.3)
Average precipitation days (≥ 1 mm) 12 16 13 17 17 16 15 14 9 13 11 12

Monthly sunshine hours in Boston, Pennsylvania, United States §

The sunniest months in Boston are June, July and August, when the sun shines an average of 10 hours 23 minutes a day.Least sunny months in Boston: January, February and December receive an average of 4 hours 14 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Boston, Pennsylvania, 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 106 137 225 239 269 303 335 317 278 224 174 142
Mean daily daylight hours 9h 39m 10h 40m 11h 58m 13h 18m 14h 25m 14h 58m 14h 40m 13h 40m 12h 24m 11h 5m 9h 55m 9h 20m

Solar UV radiation in Boston, Pennsylvania, United States §

Boston experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 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 Boston UV Index data.

Average daily maximum UV levels by month for Boston, Pennsylvania, 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 7 9 10 10 10 9 8 6 4 2