Chelmsford, MA Climate


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United States / Massachusetts / Boston-Cambridge-Newton Metro Area / Middlesex County / Chelmsford / Zip Codes
Chelmsford, MA has a humid continental climate with cold winters and warm summers. During the winter months, temperatures average between 20-30°F while in summer they can reach up to 90°F. Average annual precipitation is around 43 inches with snowfall averaging nearly 50 inches each year. The town typically sees over 200 days of sunshine per year which helps to temper the cold winter temperatures and keep it from becoming too oppressive during the summer months.

Chelmsford, Massachusetts gets 47 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Chelmsford averages 56 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 201 sunny days per year in Chelmsford. The US average is 205 sunny days.

Chelmsford gets some kind of precipitation, on average, 126 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 83 degrees
Winter Low: the January low is 15
Rain: averages 47 inches of rain a year
Snow: averages 56 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Chelmsford is 6.8 (10=best), which means it is less comfortable than most places in Massachusetts.

9.2 Summer - 4.6 Winter
August, July and June are the most pleasant months in Chelmsford, while January and February are the least comfortable months.

  ClimateChelmsford, MassachusettsUnited States
    Unlock38.1 in.
  56.0 in.  Unlock
    Unlock106.2 days
  201 days  Unlock
  83.3°85.8°
    Unlock21.7°
  6.8  Unlock
    Unlock4.3
  243 ft.  Unlock
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Chelmsford with an average high temperature of 83.3°, which ranks it as one of the hottest places in Massachusetts. In Chelmsford, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chelmsford are June, August and September.
In Chelmsford, there are 11.6 days annually when the high temperature is over 90°, which is one of the hottest places in Massachusetts.
January has the coldest nighttime temperatures for Chelmsford with an average of 15.4°. This is colder than most places in Massachusetts.
In Chelmsford, there are 139.4 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Massachusetts.
In Chelmsford, there are 5.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Massachusetts.
Humidity in Chelmsford is generally low and comfortable. But there some days when the humidity becomes unpleasant, especially in July and August. The most humid months (but still comfortable) are July, August and June.
October is the wettest month in Chelmsford with 4.4 inches of rain, and the driest month is February with 3.2 inches. The wettest season is Winter with 26% of yearly precipitation and 23% occurs in Spring, which is the driest season. The annual rainfall of 47.2 inches in Chelmsford means that it is drier than most places in Massachusetts.
May is the rainiest month in Chelmsford with 12.3 days of rain, and September is the driest month with only 8.8 rainy days. There are 126.0 rainy days annually in Chelmsford, which is about average compared to other places in Massachusetts. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 24% chance of a rainy day.
An annual snowfall of 56.0 inches in Chelmsford means that it is one of the snowiest places in Massachusetts. January is the snowiest month in Chelmsford with 16.9 inches of snow, and 6 months of the year have significant snowfall.
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