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 sea temperature 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
The coldest temperatures occur during January, when averages reach a peak of 34.2°F (1.2°C) and a low of 22.6°F (-5.2°C).Humidity
The average relative humidity in January is 76%.Rainfall
In January, the rain falls for 7.9 days. Throughout January, 2.28" (58mm) of precipitation is accumulated. Throughout the year, in Boston, there are 141.4 rainfall days, and 27.2" (691mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Boston, in January, snow falls for 7.6 days, with typically accumulated 2.76" (70mm) of snow. In Boston, during the entire year, snow falls for 29.8 days and aggregates up to 15.75" (400mm) of snow.Ocean temperature
In January, the average ocean temperature is 41.4°F (5.2°C).Note: Swimming in 41.4°F (5.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.
Daylight
In January, the average length of the day is 9h and 30min.On the first day of the month, sunrise is at 7:13 am and sunset at 4:21 pm. On the last day of January, sunrise is at 6:58 am and sunset at 4:56 pm EST.
Sunshine
In January, the average sunshine is 5.1h.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 value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In January, a daily maximum UV index of 2 leads to the following instructions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months in Boston?
How cold is it in January?
What is the average humidity in January?
How much does it rain in January?
How many days does it snow in January?
What is the ocean temperature in January?
What is the average length of the day in January?
When is the sunrise / sunset in January?
How many hours of sunshine does Boston have in January?
What is the month with the lowest UV index?
What is the UV index intensity in January?
Average temperature in January
Boston, MA
- Average high temperature in January: 34.2°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (34.2°F).
- Average low temperature in January: 22.6°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in January
Boston, MA
- Average pressure in January: 30"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
Boston, MA
- Average wind speed in January: 9.9mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in January
Boston, MA
- Average humidity in January: 76%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is April (69%).
Average rainfall in January
Boston, MA
- Average rainfall in January: 2.28"
The wettest months (with the highest rainfall) are March, April and December (2.91").
The driest month (with the least rainfall) is September (1.26").
Average rainfall days in January
Boston, MA
- Average rainfall days in January: 7.9 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.9 days).
Average snowfall in January
Boston, MA
- Average snowfall in January: 2.76"
The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Boston, MA
- Average snowfall days in January: 7.6 days
The months with the highest number of snowfall days are January and February (7.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in January
Boston, MA
- Average sea temperature in January: 41.3°F
The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (38.1°F).
Average daylight in January /
Average sunshine in January
Boston, MA
- Average daylight in January: 9h and 3min
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 1min
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
Boston, MA
- Average sunshine days in January: 17.5 days
The month with the most sunshine days is September (17.7 days).
The month with the least sunshine days is April (13 days).
Average UV index in January
Boston, 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
Boston, MA
- Average cloud cover in January: 45
The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in January
Boston, 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).
Boston, Massachusetts, USA
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