Last updated: May 6, 2024
Under the Köppen–Geiger climate classification Boston features a tropical rainforest climate (Af).Temperatures typically range between 24 °C (76 °F) and 26 °C (79 °F) through the year, but rarely can drop to 17 °C (63 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 3974 mm (156.5 inches) and receives 314 rainy days on the 1 mm (0.04 inches) threshold annually.Boston enjoys an average of 3203 hours of sunshine throughout the year, and daylight varies from 11 hours 39 minutes to 12 hours 33 minutes per day.
The warmest months in Boston are May, August and September, with daily mean temperatures ranging from 26 to 26 °C (79 - 79 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 24 to 25 °C (76 - 76 °F) throughout the day. On average each year, Boston experiences 321 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 30°C (87°F) | 31°C (88°F) | 31°C (87°F) | 32°C (91°F) | 32°C (90°F) | 32°C (91°F) | 33°C (92°F) | 34°C (93°F) | 32°C (91°F) | 33°C (91°F) | 32°C (89°F) | 31°C (87°F) |
Mean maximum | 30°C (86°F) | 30°C (85°F) | 30°C (86°F) | 31°C (88°F) | 31°C (89°F) | 31°C (88°F) | 32°C (90°F) | 32°C (91°F) | 32°C (90°F) | 32°C (89°F) | 31°C (88°F) | 30°C (87°F) |
Average high | 27°C (81°F) | 27°C (81°F) | 28°C (83°F) | 29°C (84°F) | 30°C (86°F) | 30°C (86°F) | 30°C (86°F) | 30°C (87°F) | 30°C (86°F) | 30°C (86°F) | 29°C (84°F) | 28°C (83°F) |
Daily mean | 24°C (76°F) | 24°C (76°F) | 25°C (76°F) | 25°C (78°F) | 26°C (79°F) | 26°C (79°F) | 26°C (79°F) | 26°C (79°F) | 26°C (79°F) | 26°C (79°F) | 25°C (78°F) | 25°C (77°F) |
Average low | 22°C (72°F) | 22°C (71°F) | 22°C (71°F) | 22°C (72°F) | 23°C (74°F) | 23°C (73°F) | 23°C (73°F) | 23°C (74°F) | 23°C (73°F) | 23°C (73°F) | 23°C (73°F) | 22°C (72°F) |
Mean minimum | 21°C (69°F) | 19°C (67°F) | 19°C (67°F) | 20°C (69°F) | 22°C (72°F) | 22°C (72°F) | 21°C (71°F) | 22°C (71°F) | 22°C (71°F) | 22°C (71°F) | 21°C (70°F) | 21°C (70°F) |
Minimum | 19°C (67°F) | 18°C (64°F) | 17°C (63°F) | 19°C (67°F) | 21°C (71°F) | 22°C (71°F) | 21°C (70°F) | 21°C (70°F) | 21°C (70°F) | 21°C (70°F) | 19°C (66°F) | 21°C (69°F) |
Compare temperature, precipitation, sunshine, UV index in Boston, Davao, Philippines with other places around the world.
Boston usually has the most precipitation in January, February and October, with an average of 26 rainy days and 430 mm (16.9 inches) of precipitation per month.The driest months in Boston are March, April and May. On average, 229 mm (9.0 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 470 (18.5) | 423 (16.6) | 264 (10.4) | 159 (6.3) | 265 (10.4) | 363 (14.3) | 355 (14.0) | 317 (12.5) | 368 (14.5) | 397 (15.6) | 276 (10.8) | 318 (12.5) |
Average precipitation days (≥ 1 mm) | 25 | 25 | 26 | 23 | 29 | 29 | 25 | 24 | 25 | 28 | 28 | 27 |
The sunniest months in Boston are March, April and May, when the sun shines an average of 9 hours 26 minutes a day.Least sunny months in Boston: January, November and December receive an average of 7 hours 46 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 206 | 256 | 291 | 289 | 287 | 274 | 275 | 283 | 268 | 261 | 253 | 254 |
Mean daily daylight hours | 11h 42m | 11h 51m | 12h 4m | 12h 17m | 12h 28m | 12h 33m | 12h 30m | 12h 21m | 12h 8m | 11h 55m | 11h 45m | 11h 39m |
Boston experiences the highest level of ultraviolet (UV) radiation in March, April and September, when the maximum UV index can reach values of 15 - 16, which corresponds to the Extreme category of sun exposure.January, November and December are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 13. For more detailed information, check out our hourly Boston UV Index data.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
UV Index (month maximum) | 13 | 15 | 16 | 16 | 15 | 14 | 14 | 15 | 15 | 14 | 13 | 12 |