Suffolk County · Massachusetts
Boston, MA weather averages
NOAA climate normals for 1991-2020, measured at Boston, 4.8 km from the city centre — month by month temperature, rain and snow.
Quick answer
Boston averages a daily high of 58.8°F and a daily low of 44.1°F across the year, with 43.77 inches of precipitation. July is the warmest month at 81.4°F and January the coldest at 22.2°F.
- Average annual high
- 58.8°FWarmest month July
- Average annual low
- 44.1°FColdest month January
- Precipitation per year
- 43.77 inWettest month March
- Snowfall per year
- 43.8 in91.9 days at or below 32°F
Boston weather month by month
Normal daily high and low, precipitation and snowfall for each month, 1991-2020.
| Month | High °F | Low °F | Precip in | Snow in | Range |
|---|---|---|---|---|---|
| January | 35.8 | 22.2 | 3.36 | 12.9 | 22.2 to 35.8 degrees |
| February | 38.7 | 24.7 | 3.25 | 10.9 | 24.7 to 38.7 degrees |
| March | 45.4 | 31.1 | 4.32 | 7.8 | 31.1 to 45.4 degrees |
| April | 55.6 | 40.6 | 3.74 | 1.9 | 40.6 to 55.6 degrees |
| May | 66 | 49.9 | 3.49 | 0 | 49.9 to 66 degrees |
| June | 75.9 | 59.5 | 3.68 | 0 | 59.5 to 75.9 degrees |
| July | 81.4 | 65.4 | 3.43 | 0 | 65.4 to 81.4 degrees |
| August | 79.6 | 64.6 | 3.35 | 0 | 64.6 to 79.6 degrees |
| September | 72.4 | 57.4 | 3.44 | 0 | 57.4 to 72.4 degrees |
| October | 61.4 | 46.5 | 3.94 | 0 | 46.5 to 61.4 degrees |
| November | 51.5 | 38 | 3.99 | 1.3 | 38 to 51.5 degrees |
| December | 41.2 | 28.2 | 3.78 | 9 | 28.2 to 41.2 degrees |
Source: NOAA NCEI, U.S. Climate Normals 1991-2020 — station USW00014739, Boston · rates as published for 1991-2020 normals
How to read Boston climate normals
What a climate normal is, and what it is not.
A normal is the average of thirty years of daily observations at one station — here Boston, 4.8 km from the centre of Boston. It describes a typical year, so any single year will run warmer, cooler, wetter or drier. Readings taken at an airport on the edge of town usually sit a degree or two below a dense downtown on summer nights. Boston sees about 10.3 days a year at or above 90°F and about 76.2 days with a tenth of an inch of precipitation or more.
Keep going
Other Boston data on this site.