Chelmsford (MA) Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from comfortable to very cold in Chelmsford. Average daytime temperatures reach a comfortable 29°C (84°F) in July. In February, the coolest month of the year, temperatures drop to a very cold 2°C (36°F).

At night, temperatures range from around 17°C (63°F) in July to -9°C (16°F) in February.

Check out our detailed temperature page for more information.

Temperature ranges by month

Chelmsford has a relatively rain/snowy climate with high precipitation levels, averaging 1278 mm (50 in) of rain/snowfall annually. Despite minor fluctuations, Chelmsford enjoys fairly consistent precipitation throughout the year. In October, you can expect around 129 mm (5.1 in) of precipitation, while in January, Chelmsford receives about 88 mm (3.5 in). For more details, please visit our Chelmsford Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Chelmsford can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 10.0 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 4.7 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Chelmsford.

The city experiences its highest humidity in August, reaching 72%. In February, the humidity drops to its lowest level at 62%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year