Climate and monthly weather forecast
Chelmsford, MA

Weather in January

January, like December, in Chelmsford, Massachusetts, is another cold winter month, with an average temperature varying between 32.5°F (0.3°C) and 19.9°F (-6.7°C). January is the coldest month, with an average high-temperature of 32.5°F (0.3°C) and an average low-temperature of 19.9°F (-6.7°C). Weather in January »

Weather in February

The last month of the winter, February, is another cold month in Chelmsford, Massachusetts, with temperature in the range of an average low of 21.4°F (-5.9°C) and an average high of 35.1°F (1.7°C). In Chelmsford, the average high-temperature in February is practically the same as in January - a still cold 35.1°F (1.7°C). Weather in February »

Weather in March

The first month of the spring, March, is also a wintry month in Chelmsford, Massachusetts, with temperature in the range of an average high of 42.4°F (5.8°C) and an average low of 28.8°F (-1.8°C). In March, the average high-temperature slightly increases from 35.1°F (1.7°C) in February to a still cold 42.4°F (5.8°C). Weather in March »

Weather in April

April in Chelmsford, Massachusetts, is a moderate spring month, with an average temperature varying between 55.4°F (13°C) and 39°F (3.9°C). In Chelmsford, Massachusetts, the average high-temperature in April rises from a cold 42.4°F (5.8°C) in March to a mild 55.4°F (13°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Chelmsford, Massachusetts, with an average temperature fluctuating between 48.7°F (9.3°C) and 67.1°F (19.5°C). In May, the average high-temperature increases from a mild 55.4°F (13°C) in April to a comfortable 67.1°F (19.5°C). Weather in May »

Weather in June

June, the first month of the summer in Chelmsford, is a moderately hot month, with temperature in the range of an average high of 75.2°F (24°C) and an average low of 56.3°F (13.5°C). In June, the average high-temperature slightly increases from an enjoyable 67.1°F (19.5°C) in May to a moderately hot 75.2°F (24°C). Weather in June »

Weather in July

July, like June, in Chelmsford, Massachusetts, is a moderately hot summer month, with an average temperature fluctuating between 63.1°F (17.3°C) and 82.2°F (27.9°C). July is the warmest month, with an average high-temperature of 82.2°F (27.9°C) and an average low-temperature of 63.1°F (17.3°C). In July, the average heat index is calculated to be a tropical 87.8°F (31°C). Weather in July »

Weather in August

August, the last month of the summer in Chelmsford, is also a moderately hot month, with an average temperature ranging between max 80.6°F (27°C) and min 62.2°F (16.8°C). In August, the average high-temperature is almost the same as in July - a still moderately hot 80.6°F (27°C). Weather in August »

Weather in September

September, the first month of the autumn in Chelmsford, is also an agreeable month, with an average temperature fluctuating between 72.5°F (22.5°C) and 55.4°F (13°C). In Chelmsford, Massachusetts, the average high-temperature in September slightly decreases from a warm 80.6°F (27°C) in August to an agreeable 72.5°F (22.5°C). Weather in September »

Weather in October

October, the same as September, in Chelmsford, Massachusetts, is a moderate autumn month, with an average temperature varying between 59.9°F (15.5°C) and 45.7°F (7.6°C). In Chelmsford, the average high-temperature in October decreases from a pleasant 72.5°F (22.5°C) in September to a moderate 59.9°F (15.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Chelmsford, is another chilly month, with an average temperature varying between 35.6°F (2°C) and 48.2°F (9°C). In November, the average high-temperature drops from a mild 59.9°F (15.5°C) in October to a frosty 48.2°F (9°C). Weather in November »

Weather in December

December, the first month of the winter in Chelmsford, is also a wintry month, with an average temperature fluctuating between 27.3°F (-2.6°C) and 37.9°F (3.3°C). In December, the average high-temperature decreases from a frosty 48.2°F (9°C) in November to a cold 37.9°F (3.3°C). Weather in December »
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FAQ

What is the coldest month in Chelmsford?

With an average high-temperature of 32.5°F (0.3°C) and an average low-temperature of 19.9°F (-6.7°C), January is the coldest month.

How many days does it rain in Chelmsford?

In Chelmsford, Massachusetts, during the entire year, the rain falls for 145.9 days and collects up to 27.48" (698mm) of precipitation.

When does it snow in Chelmsford?

Months with snowfall in Chelmsford, Massachusetts, are January through May, October through December.

How many days does it snow in Chelmsford?

In Chelmsford, during the entire year, snow falls for 32.6 days and aggregates up to 21.61" (549mm) of snow.

When is the lowest UV index in Chelmsford?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.

What is the most humid month in Chelmsford?

The most humid month is February, with an average relative humidity of 80%.

What is the snowiest month in Chelmsford?

The month with the most snowfall in Chelmsford, Massachusetts, is February, when snow falls for 8.3 days and typically aggregates up to 5.98" (152mm) of snow.

What is the month with the least sunshine in Chelmsford?

With an average of 4.7h of sunshine, February has the least sunshine of the year in Chelmsford, Massachusetts.

When is Daylight Saving Time (DST) in Chelmsford?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in Chelmsford, Massachusetts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in Chelmsford?

With an average relative humidity of 70%, April is the least humid month.

When it does not snow in Chelmsford?

In Chelmsford, Massachusetts, snow does not fall in June through September.

When are the longest days in Chelmsford?

With an average of 15h and 16min of daylight, June has the longest days of the year in Chelmsford, Massachusetts.

When is the highest UV index in Chelmsford?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the warmest month in Chelmsford?

The warmest month in Chelmsford, Massachusetts, is July, with an average high-temperature of 82.2°F (27.9°C) and an average low-temperature of 63.1°F (17.3°C).

What month has the most sunshine in Chelmsford?

With an average of 10.6h of sunshine, August has the most sunshine of the year in Chelmsford, Massachusetts.

What is the driest month in Chelmsford?

September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.46" (37mm) of precipitation.

What is the rainiest month in Chelmsford?

The month with the most rainfall in Chelmsford, Massachusetts, is December, when the rain falls for 10.9 days and typically aggregates up to 2.87" (73mm) of precipitation.

What is the month with the shortest days in Chelmsford?

December has the shortest days of the year, with an average of 9h and 7min of daylight.

Average temperature
Chelmsford, MA

Average temperature - Chelmsford, MA

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (32.5°F).

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).

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Average pressure
Chelmsford, MA

Average pressure - Chelmsford, MA

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed
Chelmsford, MA

Average wind speed - Chelmsford, MA

The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average rainfall
Chelmsford, MA

Average rainfall - Chelmsford, MA

The wettest month (with the highest rainfall) is December (2.87").
The driest month (with the least rainfall) is September (1.46").

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Average rainfall days
Chelmsford, MA

Average rainfall days - Chelmsford, MA

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (6.9 days).

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Average snowfall
Chelmsford, MA

Average snowfall - Chelmsford, MA

The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Chelmsford, MA

Average snowfall days - Chelmsford, MA

The month with the highest number of snowfall days is February (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Chelmsford, MA

Average daylight / Average sunshine - Chelmsford, MA

The month with the longest days is June (Average daylight: 15h and 16min).
The month with the shortest days is December (Average daylight: 9h and 7min).

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days
Chelmsford, MA

Average sunshine days - Chelmsford, MA

The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (13.6 days).

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Average UV index
Chelmsford, MA

Average UV index - Chelmsford, MA

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average visibility
Chelmsford, MA

Average visibility - Chelmsford, MA

The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).

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