Last updated: May 6, 2024
Under the Köppen–Geiger climate classification Boston features a humid subtropical climate (Cfa).Temperatures typically range between 5 °C (41 °F) and 26 °C (79 °F) through the year, but rarely can drop to -9 °C (16 °F) or can rise to as high as 31 °C (89 °F).The average annual precipitation amounts to about 1164 mm (45.8 inches) and receives 113 rainy days on the 1 mm (0.04 inches) threshold annually.Boston enjoys an average of 3278 hours of sunshine throughout the year, and daylight varies from 9 hours 35 minutes to 14 hours 42 minutes per day.
The warmest months in Boston are July, August and September, with daily mean temperatures ranging from 23 to 26 °C (75 - 79 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 5 to 8 °C (41 - 47 °F) throughout the day. On average each year, Boston experiences 65 days above 25 °C (77.0 °F) and 11 days below 0 °C (32.0 °F).
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 16°C (61°F) | 15°C (58°F) | 19°C (66°F) | 21°C (70°F) | 27°C (80°F) | 28°C (83°F) | 31°C (89°F) | 30°C (86°F) | 29°C (85°F) | 26°C (79°F) | 22°C (72°F) | 18°C (65°F) |
Mean maximum | 14°C (57°F) | 13°C (56°F) | 16°C (61°F) | 19°C (67°F) | 24°C (76°F) | 27°C (81°F) | 29°C (85°F) | 29°C (84°F) | 28°C (82°F) | 25°C (77°F) | 21°C (69°F) | 16°C (61°F) |
Average high | 7°C (45°F) | 8°C (47°F) | 10°C (50°F) | 14°C (58°F) | 19°C (66°F) | 24°C (75°F) | 27°C (81°F) | 26°C (80°F) | 25°C (76°F) | 21°C (70°F) | 14°C (58°F) | 10°C (51°F) |
Daily mean | 5°C (41°F) | 6°C (43°F) | 8°C (47°F) | 13°C (55°F) | 17°C (64°F) | 23°C (73°F) | 26°C (79°F) | 26°C (78°F) | 23°C (75°F) | 19°C (67°F) | 12°C (54°F) | 8°C (47°F) |
Average low | 3°C (38°F) | 4°C (40°F) | 6°C (44°F) | 11°C (52°F) | 16°C (61°F) | 22°C (71°F) | 25°C (77°F) | 25°C (77°F) | 23°C (73°F) | 18°C (65°F) | 11°C (51°F) | 6°C (44°F) |
Mean minimum | -4°C (25°F) | -2°C (28°F) | -0°C (32°F) | 5°C (41°F) | 11°C (52°F) | 18°C (64°F) | 22°C (71°F) | 22°C (71°F) | 18°C (65°F) | 12°C (54°F) | 3°C (38°F) | -0°C (32°F) |
Minimum | -9°C (16°F) | -6°C (21°F) | -2°C (28°F) | 3°C (37°F) | 6°C (44°F) | 15°C (59°F) | 21°C (69°F) | 20°C (68°F) | 16°C (62°F) | 10°C (50°F) | 1°C (34°F) | -4°C (24°F) |
Compare temperature, precipitation, sunshine, UV index in Boston, Virginia, United States with other places around the world.
Boston usually has the most precipitation in February, July and October, with an average of 9 rainy days and 111 mm (4.4 inches) of precipitation per month.The driest months in Boston are March, April and June. On average, 82 mm (3.2 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 94 (3.7) | 119 (4.7) | 87 (3.4) | 86 (3.4) | 89 (3.5) | 73 (2.9) | 107 (4.2) | 104 (4.1) | 105 (4.1) | 108 (4.2) | 91 (3.6) | 102 (4.0) |
Average precipitation days (≥ 1 mm) | 10 | 11 | 10 | 10 | 9 | 7 | 8 | 12 | 9 | 9 | 8 | 10 |
The sunniest months in Boston are June, July and August, when the sun shines an average of 11 hours 21 minutes a day.Least sunny months in Boston: January, February and December receive an average of 5 hours 57 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 162 | 185 | 271 | 299 | 328 | 341 | 364 | 339 | 298 | 264 | 227 | 194 |
Mean daily daylight hours | 9h 53m | 10h 48m | 11h 59m | 13h 11m | 14h 12m | 14h 42m | 14h 26m | 13h 31m | 12h 22m | 11h 10m | 10h 7m | 9h 35m |
Boston experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Boston UV Index data.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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UV Index (month maximum) | 3 | 5 | 7 | 9 | 10 | 10 | 11 | 10 | 8 | 7 | 5 | 3 |