January weather forecastCharlestown, MA
January
Weather in January
January, like December, in Charlestown, Massachusetts, is an icy winter month, with an average temperature varying between 22.5°F (-5.3°C) and 33.8°F (1°C).Temperature
Temperature records mark January as the coldest month, with highs averaging 33.8°F (1°C) and lows at 22.5°F (-5.3°C).Humidity
In Charlestown, the average relative humidity in January is 77%.Rainfall
In Charlestown, during January, the rain falls for 2.9 days and regularly aggregates up to 0.35" (9mm) of precipitation. In Charlestown, during the entire year, the rain falls for 47.8 days and collects up to 4.13" (105mm) of precipitation.Snowfall
Months with snowfall are January through May, November and December. In Charlestown, Massachusetts, during January, snow falls for 3.4 days and regularly aggregates up to 0.2" (5mm) of snow. In Charlestown, during the entire year, snow falls for 13.2 days and aggregates up to 2.17" (55mm) of snow.Daylight
In Charlestown, the average length of the day in January is 9h and 30min.On the first day of January, sunrise is at 7:13 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 4:56 pm EST.
Sunshine
In Charlestown, the average sunshine in January is 5.2h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. 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: The maximum daily UV index of 2 during January translates into the following directions:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Charlestown, MA
- Average high temperature in January: 33.8°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in January: 22.5°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in January
Charlestown, MA
- Average pressure in January: 30.01"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Charlestown, MA
- Average wind speed in January: 9.6mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in January
Charlestown, MA
- Average humidity in January: 77%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (69%).
Average rainfall in January
Charlestown, MA
- Average rainfall in January: 0.35"
The wettest month (with the highest rainfall) is November (0.55").
The driest month (with the least rainfall) is September (0.12").
Average rainfall days in January
Charlestown, MA
- Average rainfall days in January: 2.9 days
The month with the highest number of rainy days is April (5.9 days).
The months with the least rainy days are January and September (2.9 days).
Average snowfall in January
Charlestown, MA
- Average snowfall in January: 0.2"
The month with the highest snowfall is December (0.71").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in January
Charlestown, MA
- Average snowfall days in January: 3.4 days
The month with the highest number of snowfall days is January (3.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Charlestown, MA
- Average daylight in January: 9h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January: 5h and 12min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in January
Charlestown, MA
- Average sunshine days in January: 25 days
The month with the most sunshine days is December (25.5 days).
The month with the least sunshine days is July (22.8 days).
Average UV index in January
Charlestown, 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
Charlestown, MA
- Average cloud cover in January: 45
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in January
Charlestown, MA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
