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Monthly climate in Boston, New York, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Boston features a humid continental climate (Dfb).Temperatures typically range between -3 °C (27 °F) and 22 °C (72 °F) through the year, but rarely can drop to -21 °C (-6 °F) or can rise to as high as 33 °C (91 °F).The average annual precipitation amounts to about 1197 mm (47.1 inches) and receives 170 rainy days on the 1 mm (0.04 inches) threshold annually.Boston enjoys an average of 2727 hours of sunshine throughout the year, and daylight varies from 9 hours 4 minutes to 15 hours 15 minutes per day.

Monthly average temperatures in Boston, New York, United States §

The warmest months in Boston are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (67 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to 0 °C (27 - 33 °F) throughout the day. On average each year, Boston experiences 56 days above 25 °C (77.0 °F) and 106 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, New York, 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 17°C
(63°F)		 20°C
(69°F)		 22°C
(72°F)		 28°C
(82°F)		 32°C
(89°F)		 32°C
(90°F)		 33°C
(91°F)		 31°C
(88°F)		 31°C
(89°F)		 29°C
(84°F)		 25°C
(77°F)		 18°C
(65°F)
Mean maximum 12°C
(54°F)		 14°C
(58°F)		 18°C
(64°F)		 24°C
(76°F)		 30°C
(86°F)		 30°C
(86°F)		 30°C
(87°F)		 30°C
(86°F)		 29°C
(85°F)		 27°C
(81°F)		 19°C
(67°F)		 13°C
(56°F)
Average high 0°C
(33°F)		 2°C
(35°F)		 6°C
(43°F)		 12°C
(53°F)		 19°C
(66°F)		 23°C
(75°F)		 26°C
(79°F)		 26°C
(78°F)		 23°C
(73°F)		 16°C
(61°F)		 8°C
(46°F)		 3°C
(37°F)
Daily mean -3°C
(27°F)		 -2°C
(29°F)		 2°C
(35°F)		 7°C
(45°F)		 14°C
(58°F)		 19°C
(67°F)		 22°C
(72°F)		 21°C
(70°F)		 18°C
(64°F)		 12°C
(54°F)		 4°C
(40°F)		 0°C
(33°F)
Average low -6°C
(21°F)		 -5°C
(23°F)		 -2°C
(28°F)		 3°C
(38°F)		 10°C
(49°F)		 15°C
(59°F)		 18°C
(64°F)		 17°C
(63°F)		 13°C
(56°F)		 8°C
(47°F)		 1°C
(34°F)		 -3°C
(27°F)
Mean minimum -17°C
(2°F)		 -16°C
(4°F)		 -12°C
(10°F)		 -4°C
(25°F)		 1°C
(34°F)		 9°C
(48°F)		 13°C
(55°F)		 10°C
(51°F)		 6°C
(43°F)		 1°C
(34°F)		 -8°C
(18°F)		 -12°C
(11°F)
Minimum -21°C
(-6°F)		 -19°C
(-2°F)		 -18°C
(0°F)		 -5°C
(23°F)		 -2°C
(29°F)		 5°C
(42°F)		 11°C
(52°F)		 8°C
(47°F)		 3°C
(38°F)		 -0°C
(32°F)		 -14°C
(8°F)		 -19°C
(-2°F)

Compare climate in Boston with other places

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

Monthly average precipitation in Boston, New York, United States §

Boston usually has the most precipitation in April, July and October, with an average of 15 rainy days and 127 mm (5.0 inches) of precipitation per month.The driest months in Boston are March, August and September. On average, 80 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Boston, New York, 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) 87 (3.4) 90 (3.5) 80 (3.2) 119 (4.7) 107 (4.2) 89 (3.5) 127 (5.0) 85 (3.3) 76 (3.0) 134 (5.3) 99 (3.9) 105 (4.1)
Average precipitation days (≥ 1 mm) 14 16 13 15 14 12 15 13 9 16 15 18

Monthly sunshine hours in Boston, New York, United States §

The sunniest months in Boston are June, July and August, when the sun shines an average of 11 hours 0 minutes a day.Least sunny months in Boston: January, February and December receive an average of 3 hours 40 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Boston, New York, 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 90 139 219 232 285 336 338 337 292 199 150 104
Mean daily daylight hours 9h 25m 10h 32m 11h 57m 13h 25m 14h 39m 15h 15m 14h 55m 13h 49m 12h 26m 10h 59m 9h 43m 9h 4m

Solar UV radiation in Boston, New York, United States §

Boston 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 Boston UV Index data.

Average daily maximum UV levels by month for Boston, New York, 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