![]() (Note: If a snowstorm overlapped two periods, it was given 0.5 count in each time period.) (Data: NOAA/NCEI) January and February average 8 and 9 sunny days respectively, with the majority of winter days being mostly to partly cloudy.The number of Category 3 or higher Northeast snowstorms for each two-week period from December through March, according to the NESIS scale. Days below 10 degrees are typical, but rarely happen for a number of days in a row.ĭecember through March is windy for Boston weather, averaging wind speeds of 13.8mph each month. Snowfall in January averages 14 inches, and in February, the average snowfall amount is 11.3 Temperatures in January average 36, and February averages temperatures only 2 degrees warmer at 38. Boston is subject to Noreaster, which can dump large amounts of snow, lower temperatures significantly, and cause several days of overcast weather following the storm. Winter In BostonĪlthough Boston weather in the winter is not as cold as the national average, Boston usually receives more snowfall, as much as 9 more per year than average. Boston weather rarely brings snow in October, but November snowfall averages are 1.3 inches, and December averages are 11.6. Humidity declines throughout October and November, and by December, it is around 68%. ![]() Relative humidity is the highest in Boston in September, where it averages 80%. Only about half of November and December days are sunny, but the temperature is slightly warmer than average for fall in the nation. Temperatures average 63 in October, 52 in November, and 45 for early December. Around 4 inches of rain per month is common for October and November. Boston in the fall does get an occasional threat of a tropical storm or hurricane, especially in late September and early October. October averages wind speeds of about 12mph, and November averages wind speeds of 13 mph. Fall In Bostonīoston weather in the fall is usually mild, although fall weather can be affected significantly by jet streams and wind directions. July also has the most hours of sunshine for Boston weather, with an average of 300 hours. ![]() June and July come with many foggy mornings. A tornado has never hit downtown Boston, but warnings are common through the summer months.ĭespite the number of thunderstorms, average rainfall amounts during the summer are not that high, with June averaging 3.2 inches, July averaging 3.06 inches, August averaging 2.9 inches, and September averaging 3.47 inches. Throughout the summer, severe thunderstorms are common in the evenings, bringing heavy rains and winds, and sometimes hail. Boston has relatively few periods of the summer where temperatures are above 90 for several days in a row, and on average, there are only 11 days above 90 the whole season. Temperatures average 76 in June, 82 in July, 80 in August, and 73 in September. Summer In Bostonīoston weather in the summer months is cooler than the U.S. The threat of potentially severe thunderstorms affects Boston weather through the end of September. May also comes with the threat of severe thunderstorms that include damaging winds, hail, and torrential downpours. March and April average wind speeds of 13mph, and those months are the beginning of Boston long period of relatively high levels of humidity. on average.īoston receives considerable sea breezes in late spring from the cold Atlantic Ocean. These totals are a little higher than those for the U.S. April averages 3.6 inches of rainfall, and May has one of the lowest monthly averages at 3.24 inches. Rainfall totals in March are the third highest for Boston, averaging 3.85 inches. Boston is subject Noreaster, which can bring heavy rain and snow. Snow occurs frequently in March, with an average of 7.8, but rarely afterwards. Foggy mornings are typical for Boston in the spring. Spring In Bostonīoston weather in the spring is typically mild, with temperatures averaging in the mid-40s in March, mid-50s in April, and mid-60s in May. Boston weather also includes consistent rainfall distribution throughout the year as opposed to being sporadic during some months. Although summer and fall in Boston are considerably humid, and winters produce high amounts of snowfall, neither summer nor winter have the extreme temperatures that can occur in other parts of the country. Boston, Massachusetts is categorized as having a humid continental climate, which means that temperatures vary seasonally with cold, wet winters and hot, humid summers.
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