January weather forecast and climate
Chelsea, MA

Weather in January

January, like December, in Chelsea, Massachusetts, is another cold winter month, with average temperature varying between 22.6°F (-5.2°C) and 34.2°F (1.2°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 Chelsea, the average relative humidity is 76%.

Rainfall

In Chelsea, during January, the rain falls for 7.9 days and regularly aggregates up to 2.28" (58mm) of precipitation. In Chelsea, Massachusetts, during the entire year, the rain falls for 141.4 days and collects up to 27.2" (691mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Chelsea, during January, snow falls for 7.6 days and regularly aggregates up to 2.76" (70mm) of snow. In Chelsea, during the entire year, snow falls for 29.8 days, and aggregates up to 15.75" (400mm) of snow.

Ocean temperature

In Chelsea, Massachusetts,, 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

The average length of the day in Chelsea is 9.5h.

Sunshine

The average sunshine in January 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 reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: In January, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to 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.
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FAQ

What is the coldest month in Chelsea?

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.

What is the average humidity in January in Chelsea?

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

How many days does it rain in January in Chelsea?

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

How much does it snow in Chelsea in January?

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

What is the water temperature in January in Chelsea?

In Chelsea, in January, the average water 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.

How many hours of daylight does Chelsea have in January?

In Chelsea, the average length of the day in January is 9.5h.

How long on average sun shines in January in Chelsea?

The average sunshine in January is 5.1h.

What are the months with the lowest UV index in Chelsea?

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

How high is the UV index in January in Chelsea?

In Chelsea, Massachusetts, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the UV radiation.

Average temperature in January
Chelsea, MA

Average temperature in January - Chelsea, 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
Chelsea, MA

Average pressure in January - Chelsea, 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
Chelsea, MA

Average wind speed in January - Chelsea, 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
Chelsea, MA

Average humidity in January - Chelsea, 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
Chelsea, MA

Average rainfall in January - Chelsea, 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
Chelsea, MA

Average rainfall days in January - Chelsea, 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
Chelsea, MA

Average snowfall in January - Chelsea, MA
  • Average snowfall in January: 2.76"

The month with the highest snowfall is February (4.72").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Chelsea, MA

Average snowfall days in January - Chelsea, 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).

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Average sea temperature in January
Chelsea, MA

Average sea temperature in January - Chelsea, 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
Chelsea, MA

Average daylight in January / Average sunshine in January - Chelsea, 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).

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Average sunshine days in January
Chelsea, MA

Average sunshine days in January - Chelsea, 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
Chelsea, MA

Average UV index in January - Chelsea, 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).

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Average cloud cover in January
Chelsea, MA

Average cloud cover in January - Chelsea, 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
Chelsea, MA

Average visibility in January - Chelsea, MA
  • Average visibility in January: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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