Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
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.Humidity
The average relative humidity in January is 78%.Rainfall
In January, the rain falls for 8 days. Throughout January, 2.2" (56mm) of precipitation is accumulated. In Chelmsford, during the entire year, the rain falls for 145.9 days and collects up to 27.48" (698mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Chelmsford, during January, snow falls for 8.2 days and regularly aggregates up to 4.06" (103mm) of snow. Throughout the year, there are 32.6 snowfall days, and 21.61" (549mm) of snow is accumulated.Daylight
In January, the average length of the day in Chelmsford, Massachusetts, is 9h and 29min.On the first day of the month, sunrise is at 7:15 am and sunset at 4:22 pm. On the last day of January, sunrise is at 7:00 am and sunset at 4:56 pm EST.
Sunshine
In January, the average sunshine is 5.2h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the average person.Note: In January, the maximum UV index of 2 suggests these recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. To cut down UV radiation exposure by about half, sport a wide-brim hat. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Frequently asked questions
What is the coldest month in Chelmsford?
How cold is it in Chelmsford in January?
What is the average humidity in January in Chelmsford?
How many days does it rain in January in Chelmsford?
How many days does it snow in January in Chelmsford?
How many hours of daylight does Chelmsford have in January?
What time are sunrise and sunset in January in Chelmsford?
How many hours of sunshine does Chelmsford have in January?
When is the lowest UV index in Chelmsford?
What is the UV index reading in January in Chelmsford?
Average temperature in January
Chelmsford, MA
- Average high temperature in January: 32.5°F
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).
- Average low temperature in January: 19.9°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 in January
Chelmsford, MA
- Average pressure in January: 30.01"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 in January
Chelmsford, MA
- Average wind speed in January: 8.8mph
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 in January
Chelmsford, MA
- Average humidity in January: 78%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (70%).
Average rainfall in January
Chelmsford, MA
- Average rainfall in January: 2.2"
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 in January
Chelmsford, MA
- Average rainfall days in January: 8 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 in January
Chelmsford, MA
- Average snowfall in January: 4.06"
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 in January
Chelmsford, MA
- Average snowfall days in January: 8.2 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 in January /
Average sunshine in January
Chelmsford, MA
- Average daylight in January: 9h and 3min
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
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 in January
Chelmsford, MA
- Average sunshine days in January: 17.2 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 in January
Chelmsford, MA
- Average UV index in January: 2
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 in January
Chelmsford, MA
- Average cloud cover in January: 44
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 in January
Chelmsford, MA
- Average visibility in January: 6mi
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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