Chelsea, MA Weather & Climate Normals
What a normal year in Chelsea actually looks like
On the 30-year record NOAA keeps for Chelsea, MA, the comfort score comes out to 44/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Chelsea's weather actually swings
Average temperatures in Chelsea run from 30°F in Jan up to 74°F in Jul, a 44.1°F seasonal swing, a middling gap by national standards.
Chelsea, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 37°F | 23°F | 3.39in | 14.3in |
| Feb | 39°F | 25°F | 3.21in | 14.4in |
| Mar | 46°F | 31°F | 4.17in | 9in |
| Apr | 56°F | 41°F | 3.63in | 1.6in |
| May | 67°F | 50°F | 3.25in | 0in |
| Jun | 76°F | 60°F | 3.89in | 0in |
| Jul | 82°F | 66°F | 3.27in | 0in |
| Aug | 80°F | 65°F | 3.23in | 0in |
| Sep | 73°F | 58°F | 3.56in | 0in |
| Oct | 62°F | 48°F | 4.03in | 0.2in |
| Nov | 52°F | 38°F | 3.66in | 0.7in |
| Dec | 42°F | 29°F | 4.3in | 9in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are Chelsea's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet Chelsea actually gets
Over a typical year, Chelsea sees about 43.59in of precipitation a year across roughly 128 days with measurable rain or snow, with 49.2in of snow a year.
Chelsea against the rest of the country
Out of 4876 cities scored here, Chelsea comes in at 3704; within MA alone it ranks 42 of 58. Population is about 40,245.
Checking the actual forecast
These figures come from Boston Logan Intl Ap, MA US, the NOAA station 2.7 miles from Chelsea, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated