Expand
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, the same as December, is a wintry winter month in Chelmsford, Massachusetts, with an average temperature varying between 19.9°F (-6.7°C) and 32.5°F (0.3°C). Temperature readings reach their annual highs in January, averaging 32.5°F (0.3°C) and a minimum average of 19.9°F (-6.7°C). Weather in January »
Weather in February
February, the last month of the winter in Chelmsford, is also an icy month, with an average temperature varying between 35.1°F (1.7°C) and 21.4°F (-5.9°C). Welcoming February, Chelmsford notes an average high-temperature of a still cold 35.1°F (1.7°C), nearly consistent with January's 32.5°F (0.3°C). Weather in February »
Weather in March
March, the first month of the spring in Chelmsford, is also an icy month, with temperature in the range of an average low of 28.8°F (-1.8°C) and an average high of 42.4°F (5.8°C). The shift from February to March is marked by a slight increase in the average high-temperature, moving from 35.1°F (1.7°C) to a still icy 42.4°F (5.8°C). Weather in March »
Weather in April
April in Chelmsford, Massachusetts, is a mild spring month, with temperature in the range of an average low of 39°F (3.9°C) and an average high of 55.4°F (13°C). The start of April signals an increase in the average high-temperature, moving from a wintry 42.4°F (5.8°C) in March to a moderate 55.4°F (13°C). Weather in April »
Weather in May
The last month of the spring, May, is an enjoyable month in Chelmsford, Massachusetts, with temperature in the range of an average low of 48.7°F (9.3°C) and an average high of 67.1°F (19.5°C). Chelmsford's weather shows a temperature rise with the arrival of May, moving from a mild 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 varying between 75.2°F (24°C) and 56.3°F (13.5°C). The shift from May to June sees a slight increase in the average high-temperature, transitioning from an enjoyable 67.1°F (19.5°C) to a warm 75.2°F (24°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Chelmsford, Massachusetts, with an average temperature varying between 63.1°F (17.3°C) and 82.2°F (27.9°C). Chelmsford experiences its highest temperatures in July, with an average peak of 82.2°F (27.9°C) and a low of 63.1°F (17.3°C). For most parts of July, the heat index is evaluated at a tropical 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Chelmsford, is another warm month, with an average temperature ranging between max 80.6°F (27°C) and min 62.2°F (16.8°C). As Chelmsford transitions into August, the average high-temperature stands at a still warm 80.6°F (27°C), offering little variation from the preceding month. 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 low of 55.4°F (13°C) and an average high of 72.5°F (22.5°C). During the shift to September, a minor reduction in average high-temperature is observed, shifting from a moderately hot 80.6°F (27°C) in August to an agreeable 72.5°F (22.5°C). Weather in September »
Weather in October
October, like September, is another mild autumn month in Chelmsford, Massachusetts, with an average temperature varying between 45.7°F (7.6°C) and 59.9°F (15.5°C). The start of October involves a temperature drop, moving from an agreeable 72.5°F (22.5°C) in September to a mild 59.9°F (15.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Chelmsford, Massachusetts, with an average temperature ranging between min 35.6°F (2°C) and max 48.2°F (9°C). The arrival of November corresponds with a reduction in the average high-temperature, down from October's moderate 59.9°F (15.5°C) to a chilly 48.2°F (9°C). Weather in November »
Weather in December
December, the first month of the winter in Chelmsford, is also an icy month, with an average temperature ranging between max 37.9°F (3.3°C) and min 27.3°F (-2.6°C). A decrease in the average high-temperature is observed during December, shifting from a chilly 48.2°F (9°C) in November to a wintry 37.9°F (3.3°C). Weather in December »
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
During the coldest month in Chelmsford, January, temperatures average a high of 32.5°F (0.3°C) and a low of 19.9°F (-6.7°C).
How much does it rain?
Throughout the year, there are 145.9 rainfall days, and 27.48" (698mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through May, October through December.
How much does it snow?
Throughout the year, there are 32.6 snowfall days, and 21.61" (549mm) of snow is accumulated.
When is the lowest UV index in Chelmsford?
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the most humid month?
February is the most humid month, with an average relative humidity of 80%.
What is the snowiest month?
February is the month with the most snowfall in Chelmsford. Snow falls for 8.3 days and accumulates 5.98" (152mm) of snow.
What is the month with the least sunshine?
With an average of 4.7h of sunshine, February has the least sunshine of the year.
When is Daylight Saving Time (DST) in Chelmsford?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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?
With an average relative humidity of 70%, April is the least humid month.
When it does not snow?
In Chelmsford, snow does not fall in June through September.
When are the longest days in Chelmsford?
June has the longest days of the year, with an average of 15h and 18min of daylight.
When is the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What is the hottest time of year?
In Chelmsford, July is the warmest month, with temperatures averaging a high of 82.2°F (27.9°C) and a low of 63.1°F (17.3°C).
What month has the most sunshine?
The month with the most sunshine is August, with an average of 10.6h of sunshine.
What is the driest month?
September is the month with the least rainfall. Rain falls for 11.5 days and accumulates 1.46" (37mm) of precipitation.
What is the wettest month in Chelmsford?
The month with the most rainfall 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?
With an average of 9h and 6min of daylight, December has the shortest days of the year.
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
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location