January weather forecast and climate
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 average temperature fluctuating between 34.2°F (1.2°C) and 22.6°F (-5.2°C).

Temperature

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

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. In Boston, during the entire year, the rain falls for 141.4 days and collects up to 27.2" (691mm) of precipitation.

Snowfall

Months with snowfall in Boston, Massachusetts, are January through May, October through December. In Boston, Massachusetts,, during 7.6 snowfall days, 2.76" (70mm) of snow is typically accumulated. Throughout the year, in Boston, there are 29.8 snowfall days, and 15.75" (400mm) of snow is accumulated.

Ocean temperature

In Boston, the average water 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 9.5h.

Sunshine

In Boston, the average sunshine is 5.1h.

UV index

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 threat to health from the exposure to the Sun's UV rays for the average person.
Note: In January, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for 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.
[Resources]

FAQ

What is the coldest month in Boston?

The coldest month in Boston 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?

The average relative humidity in January in Boston is 76%.

How many days does it rain in January in Boston?

In Boston, in January, it is raining for 7.9 days, with typically 2.28" (58mm) of accumulated precipitation.

How many days does it snow in January in Boston?

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). 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.

What is the average length of the day in January in Boston?

The average length of the day in January in Boston, Massachusetts, is 9.5h.

How many hours of sunshine does Boston have in January?

The average sunshine in January in Boston, Massachusetts, is 5.1h.

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

Months with the lowest UV index in Boston, Massachusetts, are January through March, November and December, with an average maximum UV index of 2.

What is the UV index intensity in January in Boston?

In Boston, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to the Sun's UV rays.

Average temperature in January
Boston, MA

Average temperature in January - Boston, MA
  • Average high temperature in January: 1.2°C

The warmest month (with the highest average high temperature) is July (27.6°C).
The month with the lowest average high temperature is January (1.2°C).

  • Average low temperature in January: -5.2°C

The month with the highest average low temperature is July (18.3°C).
The coldest month (with the lowest average low temperature) is January (-5.2°C).

[Resources]

Average pressure in January
Boston, MA

Average pressure in January - Boston, MA
  • Average pressure in January: 1016mbar

The month with the highest atmospheric pressure is November (1018.1mbar).
The month with the lowest atmospheric pressure is June (1013.4mbar).

[Resources]

Average wind speed in January
Boston, MA

Average wind speed in January - Boston, MA
  • Average wind speed in January: 15.9km/h

The windiest month (with the highest average wind speed) is January (15.9km/h).
The calmest month (with the lowest average wind speed) is August (9.9km/h).

[Resources]

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%).

[Resources]

Average rainfall in January
Boston, MA

Average rainfall in January - Boston, MA
  • Average rainfall in January: 58mm

The wettest months (with the highest rainfall) are March, April and December (74mm).
The driest month (with the least rainfall) is September (32mm).

[Resources]

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).

[Resources]

Average snowfall in January
Boston, MA

Average snowfall in January - Boston, MA
  • Average snowfall in January: 70mm

The month with the highest snowfall is February (120mm).
Months with the least snowfall are June, July, August and September (0mm).

[Resources]

Average snowfall days in January
Boston, MA

Average snowfall days in January - Boston, MA
  • Average snowfall days in January: 7.6 days

Months with the highest number of snowfall days are January and February (7.6 days).
Months with the least snowfall days are June, July, August and September (0 days).

[Resources]

Average sea temperature in January
Boston, MA

Average sea temperature in January - Boston, MA
  • Average sea temperature in January: 5.2°C

The best month for swimming (with the highest average sea temperature) is August (20°C).
The coldest month (with the lowest average sea temperature) is February (3.4°C).

[Resources]

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

Average daylight in January / Average sunshine in January - Boston, MA
  • Average daylight in January: 9.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.1h).

  • 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).

[Resources]

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).

[Resources]

Average UV index in January
Boston, MA

Average UV index in January - Boston, MA
  • Average UV index in January: 2

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

[Resources]

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).

[Resources]

Average visibility in January
Boston, MA

Average visibility in January - Boston, MA
  • Average visibility in January: 9km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location