Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average sea temperature in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
In Groton, January is the coldest month, with temperatures averaging a high of 36.1°F (2.3°C) and a low of 26.2°F (-3.2°C).Humidity
The months with the lowest humidity are January, March, April and November, with an average relative humidity of 74%.Rainfall
In January, the rain falls for 10.8 days. Throughout January, 2.64" (67mm) of precipitation is accumulated. In Groton, during the entire year, the rain falls for 159.8 days and collects up to 33.07" (840mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In January, it is snowing for 5.9 days. Throughout January, 1.81" (46mm) of snow is 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: In 41.9°F (5.5°C), cold shock and rapid breathing can occur when swimming at temperatures below 50°F (10°C).
Daylight
In January, the average length of the day is 9h and 35min.On the first day of January, 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 5:02 pm EST.
Sunshine
In Groton, the average sunshine in January 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. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In January, a regular UV index of 2 translates into these guidelines:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is January?
What is the least humid month?
What is the average humidity in January?
How much does it rain in January?
How many days does it snow in January?
How cold is the water in January?
How many hours of daylight does Groton have in January?
What time are sunrise and sunset in January?
How many hours of sunshine does Groton have in January?
When is the lowest UV index?
How high is the UV index in January?
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).
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).
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).
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%).
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").
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).
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").
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).
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).
Average daylight in January /
Average sunshine in January
Groton, CT
- Average daylight in January: 9h and 4min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January: 5h and 1min
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).
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).
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).
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).
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).
Groton, Connecticut, USA
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