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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, in Chelmsford, Massachusetts, is an icy winter month, with temperature in the range of an average low of 19.9°F (-6.7°C) and an average high of 32.5°F (0.3°C). January, with its high-temperature average of 32.5°F (0.3°C) and a low-temperature average of 19.9°F (-6.7°C), is the coldest month. Weather in January »
Weather in February
February, the last month of the winter in Chelmsford, is also a wintry month, 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). February's arrival brings an average high-temperature of a still cold 35.1°F (1.7°C), demonstrating subtle variation from the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Chelmsford, is still a cold month, with an average temperature varying between 42.4°F (5.8°C) and 28.8°F (-1.8°C). With the onset of March, Chelmsford observes a minor temperature ascent, with the average high-temperature adjusting from February's wintry 35.1°F (1.7°C) to a still cold 42.4°F (5.8°C). Weather in March »
Weather in April
April is a mild spring month in Chelmsford, Massachusetts, with temperature in the range of an average high of 55.4°F (13°C) and an average low of 39°F (3.9°C). In Chelmsford, the onset of April comes with an increased average high-temperature, moving from March's cold 42.4°F (5.8°C) to a refreshing 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 temperature in the range of an average high of 67.1°F (19.5°C) and an average low of 48.7°F (9.3°C). The onset of May marks an increase in the average high-temperature, moving from a moderate 55.4°F (13°C) in April to a still refreshing 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 an average temperature ranging between max 75.2°F (24°C) and min 56.3°F (13.5°C). June's arrival signals a modest temperature shift, moving from a comfortable 67.1°F (19.5°C) in May to a moderately hot 75.2°F (24°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Chelmsford, Massachusetts, with an average temperature varying between 82.2°F (27.9°C) and 63.1°F (17.3°C). The warmest period is July, when temperatures fluctuate between an average high of 82.2°F (27.9°C) and a low of 63.1°F (17.3°C). In July, the average heat index is appraised at a tropical 87.8°F (31°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Chelmsford, Massachusetts, with an average temperature ranging between min 62.2°F (16.8°C) and max 80.6°F (27°C). The arrival of August sees a recorded average high-temperature of a still warm 80.6°F (27°C), showing little divergence from the previous month's conditions. Weather in August »
Weather in September
September, the first month of the autumn in Chelmsford, is also an agreeable month, with temperature in the range of an average high of 72.5°F (22.5°C) and an average low of 55.4°F (13°C). In Chelmsford, entering September brings a subtle temperature decrement, reducing from August's warm 80.6°F (27°C) to an agreeable 72.5°F (22.5°C). Weather in September »
Weather in October
October, like September, is a moderate autumn month in Chelmsford, Massachusetts, with an average temperature ranging between max 59.9°F (15.5°C) and min 45.7°F (7.6°C). October indicates a shift in the average high-temperature, from September's agreeable 72.5°F (22.5°C) to a refreshing 59.9°F (15.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Chelmsford, is also a frosty month, with an average temperature fluctuating between 48.2°F (9°C) and 35.6°F (2°C). November is characterized by a reduction in the average high-temperature, 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
The first month of the winter, December, is still a cold month in Chelmsford, Massachusetts, with temperature in the range of an average low of 27.3°F (-2.6°C) and an average high of 37.9°F (3.3°C). December involves a decrease in temperature, down from a frosty 48.2°F (9°C) in November to a wintry 37.9°F (3.3°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest month in Chelmsford?
January brings the lowest temperatures, with an average high of 32.5°F (0.3°C) and an average low of 19.9°F (-6.7°C).
How many days does it rain in Chelmsford?
Throughout the year, in Chelmsford, there are 145.9 rainfall days, and 27.48" (698mm) of precipitation is accumulated.
When does it snow in Chelmsford?
January through May, October through December are months with snowfall in Chelmsford.
How much does it snow in Chelmsford?
In Chelmsford, Massachusetts, 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 in Chelmsford are January through March, November and December, with an average maximum UV index of 2.
What is the most humid month in Chelmsford?
February is the most humid month in Chelmsford, Massachusetts, with an average relative humidity of 80%.
What is the snowiest month in Chelmsford?
The month with the most snowfall 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?
February has the least sunshine of the year, with an average of 4.7h of sunshine.
When is Daylight Saving Time (DST) in Chelmsford?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Chelmsford, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
What is the least humid month in Chelmsford?
April is the least humid month, with an average relative humidity of 70%.
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 18min of daylight, June has the longest days of the year in Chelmsford.
What are the months with the highest UV index in Chelmsford?
The months with the highest UV index in Chelmsford are June through August, with an average maximum UV index of 6.
What part of the year is the hottest in Chelmsford?
Chelmsford's warmest month, July, registers temperatures that range from a high of 82.2°F (27.9°C) to a low 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.
What is the driest month in Chelmsford?
September is the month with the least rainfall in Chelmsford, Massachusetts. Rain falls for 11.5 days and accumulates 1.46" (37mm) of precipitation.
What is the rainiest month in Chelmsford?
December is the month with the most rainfall. Rain falls for 10.9 days and accumulates 2.87" (73mm) of precipitation.
What is the month with the shortest days in Chelmsford?
The month with the shortest days is December, with an average of 9h and 6min of daylight.
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).
Average pressure
Chelmsford, MA
- Average pressure in January:
30.01"Hg - Average pressure in February:
29.99"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.97"Hg - Average pressure in May:
30"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.94"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.03"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Chelmsford, MA
- Average wind speed in January:
8.8mph - Average wind speed in February:
8.6mph - Average wind speed in March:
8.4mph - Average wind speed in April:
7.9mph - Average wind speed in May:
6.6mph - Average wind speed in June:
6.1mph
- Average wind speed in July:
5.5mph - Average wind speed in August:
5.5mph - Average wind speed in September:
5.9mph - Average wind speed in October:
7.1mph - Average wind speed in November:
7.6mph - Average wind speed in December:
8.3mph
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).
Average humidity
Chelmsford, MA
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (70%).
Average rainfall
Chelmsford, MA
- Average rainfall in January:
2.2" - Average rainfall in February:
2.13" - Average rainfall in March:
2.56" - Average rainfall in April:
2.6" - Average rainfall in May:
2.01" - Average rainfall in June:
2.28"
- Average rainfall in July:
2.05" - Average rainfall in August:
1.93" - Average rainfall in September:
1.46" - Average rainfall in October:
2.76" - Average rainfall in November:
2.64" - Average rainfall in December:
2.87"
The wettest month (with the highest rainfall) is December (2.87").
The driest month (with the least rainfall) is September (1.46").
Average rainfall days
Chelmsford, MA
- Average rainfall days in January:
8 days - Average rainfall days in February:
6.9 days - Average rainfall days in March:
11.5 days - Average rainfall days in April:
13.9 days - Average rainfall days in May:
15.6 days - Average rainfall days in June:
15.1 days
- Average rainfall days in July:
15.4 days - Average rainfall days in August:
13.1 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
13.6 days - Average rainfall days in November:
10.4 days - Average rainfall days in December:
10.9 days
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).
Average snowfall
Chelmsford, MA
- Average snowfall in January:
4.06" - Average snowfall in February:
5.98" - Average snowfall in March:
4.45" - Average snowfall in April:
1.73" - Average snowfall in May:
0.16" - Average snowfall in June:
0"
The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Chelmsford, MA
- Average snowfall days in January:
8.2 days - Average snowfall days in February:
8.3 days - Average snowfall days in March:
7.3 days - Average snowfall days in April:
1.5 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
1.5 days - Average snowfall days in December:
5.6 days
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).
Average daylight / Average sunshine
Chelmsford, MA
- Average daylight in January:
9h and 3min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
5h and 1min - Average sunshine in February:
4h and 4min - Average sunshine in March:
5h and 5min - Average sunshine in April:
8h and 2min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 1min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
10h and 4min - Average sunshine in September:
8h and 3min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 5min
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).
Average sunshine days
Chelmsford, MA
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
14.6 days - Average sunshine days in March:
15 days - Average sunshine days in April:
13.7 days - Average sunshine days in May:
13.6 days - Average sunshine days in June:
13.8 days
- Average sunshine days in July:
14.2 days - Average sunshine days in August:
15.9 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
14.8 days - Average sunshine days in November:
17.4 days - Average sunshine days in December:
16.6 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (13.6 days).
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).
Average cloud cover
Chelmsford, MA
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).
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).
Chelmsford, Massachusetts, USA
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