January weather forecast
Boston, MA

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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

The Boston climate in January begins on a chilly note as the new year unfolds. Cold winter conditions govern the area with both high and low temperatures resting between 34.2°F (1.2°C) and 22.6°F (-5.2°C). On average, snowfall occurs for 7.6 days, leaving a total accumulation of 2.76" (70mm). This month's frosty weather dictates the necessity of warm clothing, especially during the evenings. A gentle reminder goes to watch out for slippery surfaces caused by the settled snow.

Temperature

January stands out as Boston's coldest month, with an average high-temperature of 34.2°F (1.2°C) and a low-temperature of 22.6°F (-5.2°C).

Humidity

In January, the average relative humidity is 76%.

Rainfall

In Boston, in January, during 7.9 rainfall days, 2.28" (58mm) of precipitation is typically accumulated. Throughout the year, in Boston, there are 141.4 rainfall days, and 27.2" (691mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In January, in Boston, it is snowing for 7.6 days. Throughout January, 2.76" (70mm) of snow is accumulated. In Boston, Massachusetts, during the entire year, snow falls for 29.8 days and aggregates up to 15.75" (400mm) of snow.

Ocean temperature

In Boston, the average seawater temperature in January is 41.4°F (5.2°C).
Note: Swimming at temperatures less than 50°F (10°C) in 41.4°F (5.2°C) is feasible with the right swimsuit; if not, expect cold shock and breathlessness. A quick swim at 55.4°F (13°C) without adequate warmth can be discomforting.

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 Boston, the average sunshine in January 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 low threat to health from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index of 2 during January translates into these guidelines:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. To avoid the Sun's strongest rays, limit exposure around the mid-day period. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
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Frequently asked questions

What are the coldest months in Boston?

Boston's January weather, marked by an average high temperature of 34.2°F (1.2°C) and an average low temperature of 22.6°F (-5.2°C), is the coldest in the year.

How cold is January in Boston?

During January, Boston experiences an average high-temperature of 34.2°F (1.2°C) and a low-temperature of 22.6°F (-5.2°C).

What is the average humidity in January in Boston?

In January, the average relative humidity is 76%.

How many days does it rain in January in Boston?

In Boston, Massachusetts, during January, the rain falls for 7.9 days and regularly aggregates up to 2.28" (58mm) of precipitation.

How many days does it snow in January in Boston?

In Boston, in January, snow falls for 7.6 days, with typically accumulated 2.76" (70mm) of snow.

What is the ocean temperature in January in Boston?

In Boston, the average seawater temperature in January is 41.4°F (5.2°C). Swimming in 41.4°F (5.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Boston have in January?

In January, the average day length in Boston is 9h and 30min.

When are sunrise and sunset in January in Boston?

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.

How many hours of sunshine does Boston have in January?

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

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

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

What is the UV index reading in January in Boston?

The average daily maximum UV index in January in Boston is 2. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"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).

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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 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).

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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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Boston, Massachusetts, USA

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