January weather forecast and climate
Boston, MA

A beautiful natural park with the George Washington Monument in Boston, Massachusetts, with a sneak view of the city skyscrapers
A beautiful natural park with the George Washington Monument in Boston, Massachusetts, with a sneak view of the city skyscrapers
January is the coldest month in Boston, with the temperature in the low range from 22.3°F (-5.4°C) to 35.8°F (2.1°C). Winter is at its peak, and blizzards are frequent, as are snowstorms. The nights are freezing, and occasionally, the temperature drops lower than 19.4°F (-7°C).
January receives the highest snowfall of the year accumulating to 12.9" (327.7mm), from an average of seven snowfall days. There is fairly minimal rainfall in January, falling for approximately eleven days to collect a mildly low 3.4" (86.4mm) in precipitation.

What is the coldest month in Boston?

With an average high-temperature of 35.8°F (2.1°C) and an average low-temperature of 22.3°F (-5.4°C), January is the coldest month in Boston, Massachusetts.

What is the temperature in January in Boston?

In Boston, in January, the average high-temperature is 35.8°F (2.1°C), and the average low-temperature is 22.3°F (-5.4°C).

How much does it rain in Boston in January?

In January, in Boston, the rain falls for 11.3 days. Throughout January, 3.4" (85.3mm) of precipitation is accumulated.

How many days does it snow in January in Boston?

In Boston, Massachusetts, in January, snow falls for 6.7 days, with typically accumulated 12.9" (327.7mm) of snow.

When does it snow the most in Boston?

January is the month with the most snowfall in Boston, Massachusetts. Snow falls for 6.7 days and accumulates 12.9" (327.7mm) of snow.

How cold is the water in January in Boston?

In January, the average sea temperature 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.
Average temperature in January - Boston, MA
  • Average high temperature in January: 2.1°C

The warmest month (with the highest average high temperature) is July (27.4°C).
The month with the lowest average high temperature is January (2.1°C).

  • Average low temperature in January: -5.4°C

The month with the highest average low temperature is July (18.6°C).
The coldest month (with the lowest average low temperature) is January (-5.4°C).

Average humidity in January - Boston, MA
  • Average humidity in January: 62.3%

The month with the highest relative humidity is September (71.8%).
The month with the lowest relative humidity is February (62%).

Average rainfall in January - Boston, MA
  • Average rainfall in January: 85.3mm

The wettest month (with the highest rainfall) is March (109.7mm).
The driest month (with the lowest rainfall) is February (82.6mm).

Average rainfall days in January - Boston, MA
  • Average rainfall days in January: 11.3 days

The month with the highest number of rainy days is May (12 days).
The month with the lowest number of rainy days is September (8.6 days).

Average snowfall in January - Boston, MA
  • Average snowfall in January: 327.7mm

The month with the highest snowfall is January (327.7mm).
Months with the lowest snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in January - Boston, MA
  • Average snowfall days in January: 6.7 days

The month with the highest number of snowfall days is January (6.7 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

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).

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 shortest days is December (Average daylight: 9.1h).

  • Average sunshine in January: 5.3h

The month with most sunshine is July (Average sunshine: 9.7h).
The month with least sunshine is December (Average sunshine: 4.6h).

Average UV index in January - Boston, MA
  • Average UV index in January: 1

Months with the highest UV index are June, July and August (UV index 8).
Months with the lowest UV index are January and December (UV index 1).

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