January weather forecast
Boston, MA

A beautiful natural park with the George Washington Monument in Boston, Massachusetts
A beautiful natural park with the George Washington Monument in Boston, Massachusetts

Weather in January

January, like December, in Boston, Massachusetts, is a wintry winter month, with an average temperature varying between 34.2°F (1.2°C) and 22.6°F (-5.2°C).

Temperature

With an average high-temperature of 34.2°F (1.2°C) and an average low-temperature of 22.6°F (-5.2°C), January is the coldest month.

Humidity

In January, the average relative humidity in Boston is 76%.

Rainfall

In Boston, during January, the rain falls for 7.9 days and regularly aggregates up to 2.28" (58mm) of precipitation. Throughout the year, 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 Boston, during January, snow falls for 7.6 days and regularly aggregates up to 2.76" (70mm) of snow. Throughout the year, there are 29.8 snowfall days, and 15.75" (400mm) of snow is accumulated.

Ocean temperature

In January, the average ocean temperature is 41.4°F (5.2°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

In January, the average length of the day is 9h and 30min.
On the first day of January in Boston, sunrise is at 7:13 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 4:56 pm EST.

Sunshine

In Boston, the average sunshine in January is 5.1h.

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 reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 2 in January transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Boston?

The coldest month is January, with an average high-temperature of 34.2°F (1.2°C) and an average low-temperature of 22.6°F (-5.2°C).

What is the average humidity in January in Boston?

In Boston, Massachusetts, the average relative humidity in January is 76%.

How much does it rain in Boston in January?

In Boston, in January, during 7.9 rainfall days, 2.28" (58mm) of precipitation is typically accumulated.

How much does it snow in Boston in January?

In Boston, Massachusetts, during January, snow falls for 7.6 days and regularly aggregates up to 2.76" (70mm) of snow.

How cold is the water in January in Boston?

In Boston, Massachusetts, the average seawater temperature in January is 41.4°F (5.2°C). 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.

How many hours of daylight does Boston have in January?

The average day length in January is 9h and 30min.

When is the sunrise / sunset in January in Boston?

In January, on the first day of the month, sunrise is at 7:13 am and sunset at 4:22 pm. On the last day of the month, in Boston, sunrise is at 6:58 am and sunset at 4:56 pm EST.

How many hours of sunshine does Boston have in January?

The average sunshine duration in January is 5.1h.

What is the month with the lowest UV index in Boston?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in January in Boston?

The average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in January
Boston, MA

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).

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Average pressure in January
Boston, MA

Average pressure in January - Boston, MA
  • Average pressure in January: 30"

The month with the highest atmospheric pressure is November (30.06").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in January
Boston, MA

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).

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Average humidity in January
Boston, MA

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%).

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Average rainfall in January
Boston, MA

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").

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Average rainfall days in January
Boston, MA

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).

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Average snowfall in January
Boston, MA

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").

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Average snowfall days in January
Boston, MA

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).

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Average sea temperature in January
Boston, MA

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).

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Average daylight in January /
Average sunshine in January
Boston, MA

Average daylight in January / Average sunshine in January - Boston, MA
  • Average daylight in January: 9h and 30min

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

  • Average sunshine in January: 5.1h

The month with the most sunshine is August (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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Average sunshine days in January
Boston, MA

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).

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Average UV index in January
Boston, MA

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).

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Average cloud cover in January
Boston, MA

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).

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Average visibility in January
Boston, MA

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).

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