January weather forecast
Groton, CT

Weather in January

January, the same as December, is a wintry winter month in Groton, Connecticut, with an average temperature fluctuating between 26.2°F (-3.2°C) and 36.1°F (2.3°C).

Temperature

With an average high-temperature of 36.1°F (2.3°C) and an average low-temperature of 26.2°F (-3.2°C), January is the coldest month.

Humidity

January, March, April and November, with an average relative humidity of 74%, are the least humid months.

Rainfall

In Groton, during January, the rain falls for 10.8 days and regularly aggregates up to 2.64" (67mm) of precipitation. Throughout the year, in Groton, there are 159.8 rainfall days, and 33.07" (840mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In Groton, in January, during 5.9 snowfall days, 1.81" (46mm) of snow is typically accumulated. Throughout the year, there are 24 snowfall days, and 7.68" (195mm) of snow is accumulated.

Ocean temperature

In Groton, the average seawater temperature in January is 41.9°F (5.5°C).
Note: Swimming in 41.9°F (5.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In Groton, the average length of the day in January is 9h and 35min.
On the first day of the month, sunrise is at 7:14 am and sunset at 4:29 pm. On the last day of January, sunrise is at 7:00 am and sunset at 5:03 pm EST.

Sunshine

In January, the average sunshine is 5.2h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Groton. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 Groton?

January is the coldest month in Groton, Connecticut, with an average high-temperature of 36.1°F (2.3°C) and an average low-temperature of 26.2°F (-3.2°C).

What is the least humid month in Groton?

January, March, April and November, with an average relative humidity of 74%, are the least humid months in Groton, Connecticut.

What is the average humidity in January in Groton?

In January, the average relative humidity is 74%.

How much does it rain in Groton in January?

In Groton, Connecticut, in January, during 10.8 rainfall days, 2.64" (67mm) of precipitation is typically accumulated.

How much does it snow in Groton in January?

In Groton, Connecticut, during January, snow falls for 5.9 days and regularly aggregates up to 1.81" (46mm) of snow.

How cold is the water in January in Groton?

In Groton, in January, the average water temperature is 41.9°F (5.5°C). Swimming in 41.9°F (5.5°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.

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

The average day length in January in Groton, Connecticut, is 9h and 35min.

When is the sunrise / sunset in January in Groton?

On the first day of January in Groton, sunrise is at 7:14 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 5:03 pm EST.

How many hours of sunshine does Groton have in January?

The average sunshine duration in January in Groton is 5.2h.

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

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

What is the UV index reading in January in Groton?

In January, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Groton, CT

Average temperature in January - Groton, CT
  • Average high temperature in January: 36.1°F

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in January: 26.2°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

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Average pressure in January
Groton, CT

Average pressure in January - Groton, CT
  • Average pressure in January: 30.03"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in January
Groton, CT

Average wind speed in January - Groton, CT
  • Average wind speed in January: 11.9mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).

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Average humidity in January
Groton, CT

Average humidity in January - Groton, CT
  • Average humidity in January: 74%

The month with the highest relative humidity is June (80%).
The months with the lowest relative humidity are January, March, April and November (74%).

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Average rainfall in January
Groton, CT

Average rainfall in January - Groton, CT
  • Average rainfall in January: 2.64"

The wettest month (with the highest rainfall) is December (3.86").
The driest month (with the least rainfall) is September (1.65").

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Average rainfall days in January
Groton, CT

Average rainfall days in January - Groton, CT
  • Average rainfall days in January: 10.8 days

The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (9.5 days).

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Average snowfall in January
Groton, CT

Average snowfall in January - Groton, CT
  • Average snowfall in January: 1.81"

The month with the highest snowfall is March (2.56").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in January
Groton, CT

Average snowfall days in January - Groton, CT
  • Average snowfall days in January: 5.9 days

The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature in January
Groton, CT

Average sea temperature in January - Groton, CT
  • Average sea temperature in January: 41.9°F

The best month for swimming (with the highest average sea temperature) is August (72.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).

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Average daylight in January /
Average sunshine in January
Groton, CT

Average daylight in January / Average sunshine in January - Groton, CT
  • Average daylight in January: 9h and 35min

The month with the longest days is June (Average daylight: 15h and 7min).
The month with the shortest days is December (Average daylight: 9h and 15min).

  • Average sunshine in January: 5h and 12min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).

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Average sunshine days in January
Groton, CT

Average sunshine days in January - Groton, CT
  • Average sunshine days in January: 15.1 days

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is February (12.5 days).

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Average UV index in January
Groton, CT

Average UV index in January - Groton, CT
  • 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
Groton, CT

Average cloud cover in January - Groton, CT
  • Average cloud cover in January: 45

The months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in January
Groton, CT

Average visibility in January - Groton, CT
  • 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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