January weather forecast
Cos Cob, CT

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Weather in January

In Cos Cob, the weather in January starts the year off with a mix of rain, snow and cold temperatures. It's a bit fresher compared to December, especially at night. Notably, January has less daylight hours, an average of 9.6 hours a day, with a high of 35.8°F (2.1°C) and a low of 26.1°F (-3.3°C). The snowfall is typical for this time of the year, decorating the city white. Wrapping up, January’s weather is wintery-chilly, snowy, and less daylight making it the perfect climate for indoor activities.

Temperature

The month of January, characterized by an average high of 35.8°F (2.1°C) and a low of 26.1°F (-3.3°C), is recognized as the coldest.

Humidity

The average relative humidity in January is 74%.

Rainfall

January and February are months with the least rain in Cos Cob when the rain falls for 7.9 days and typically aggregates up to 2.4" (61mm) of rain.

Snowfall

Months with snowfall are January through April, November and December. In Cos Cob, in January, during 7.2 snowfall days, 1.97" (50mm) of snow is typically accumulated. In Cos Cob, during the entire year, snow falls for 25.5 days and aggregates up to 8.78" (223mm) of snow.

Ocean temperature

In January, the average ocean temperature in Cos Cob is 41.7°F (5.4°C).
Note: Swimming in 41.7°F (5.4°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In January, the average length of the day is 9h and 37min.
On the first day of January, sunrise is at 7:19 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:09 pm EST.

Sunshine

In Cos Cob, the average sunshine in January is 5h.

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 estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index, 2 during January, leads to the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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Frequently asked questions

What time of the year is the coldest in Cos Cob?

The coldest temperatures in Cos Cob, Connecticut, occur during January, when averages reach a peak of 35.8°F (2.1°C) and a low of 26.1°F (-3.3°C).

How cold is January in Cos Cob?

January temperatures vary between a high-temperature of 35.8°F (2.1°C) and a low-temperature of 26.1°F (-3.3°C).

What is the average humidity in January in Cos Cob?

In Cos Cob, the average relative humidity in January is 74%.

What is the driest month in Cos Cob?

January and February are months with the least rain when the rain falls for 7.9 days and typically aggregates up to 2.4" (61mm) of rain.

How much does it rain in Cos Cob in January?

In Cos Cob, during January, the rain falls for 7.9 days and regularly aggregates up to 2.4" (61mm) of precipitation.

How many days does it snow in January in Cos Cob?

In Cos Cob, in January, snow falls for 7.2 days, with typically accumulated 1.97" (50mm) of snow.

What is the ocean temperature in January in Cos Cob?

In Cos Cob, Connecticut, the average seawater temperature in January is 41.7°F (5.4°C). Swimming in 41.7°F (5.4°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 Cos Cob have in January?

In Cos Cob, the average day length in January is 9h and 37min.

What time are sunrise and sunset in January in Cos Cob?

On the first day of January, sunrise is at 7:19 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:09 pm EST.

How long on average sun shines in January in Cos Cob?

The average sunshine duration in January in Cos Cob, Connecticut, is 5h.

What are the months with the lowest UV index in Cos Cob?

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 Cos Cob?

The average daily maximum UV index in January in Cos Cob, Connecticut, is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
41.9°F 5.5°C
35.8°F 2.1°C
38.3°F 3.5°C
Average low temperature
33.3°F 0.7°C
26.1°F -3.3°C
27.7°F -2.4°C
Average pressure
30.06" 764mmHg
30.05" 763mmHg
30.03" 763mmHg
Average wind speed
9.6mph 15.4km/h
9.9mph 15.9km/h
9.6mph 15.4km/h
Average max. wind speed
10.4mph 16.7km/h
10.6mph 17.1km/h
10.3mph 16.6km/h
Average wind speed gusts
14.5mph 23.3km/h
14.9mph 24km/h
14.9mph 24km/h
Average humidity
75%
74%
75%
Average rainfall
3.86" 98mm
2.4" 61mm
2.4" 61mm
Average rainfall days
12
7.9
10.5
Average snowfall
1.61" 41mm
1.97" 50mm
2.52" 64mm
Average snowfall days
4.6
7.2
7.1
Average sea temperature
47.1°F 8.4°C
41.6°F 5.3°C
39.5°F 4.2°C
Average daylight
9h 2min
9h 4min
10h 4min
Average sunshine
4h 5min
5h 0min
4h 4min
Average sunshine days
15.2
17.6
13.5
Average UV index
2
2
2
Average cloud cover
49%
45%
48%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Cos Cob, CT

Average temperature in January - Cos Cob, CT
  • Average high temperature in January: 35.8°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (35.8°F).

  • Average low temperature in January: 26.1°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

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Average pressure in January
Cos Cob, CT

Average pressure in January - Cos Cob, CT
  • Average pressure in January: 30.05"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in January
Cos Cob, CT

Average wind speed in January - Cos Cob, CT
  • 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 July (6.5mph).

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Average humidity in January
Cos Cob, CT

Average humidity in January - Cos Cob, CT
  • Average humidity in January: 74%

The months with the highest relative humidity are February, May and December (75%).
The month with the lowest relative humidity is August (71%).

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Average rainfall in January
Cos Cob, CT

Average rainfall in January - Cos Cob, CT
  • Average rainfall in January: 2.4"

The wettest month (with the highest rainfall) is July (4.13").
The driest months (with the least rainfall) are January and February (2.4").

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Average rainfall days in January
Cos Cob, CT

Average rainfall days in January - Cos Cob, CT
  • Average rainfall days in January: 7.9 days

The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is January (7.9 days).

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Average snowfall in January
Cos Cob, CT

Average snowfall in January - Cos Cob, CT
  • Average snowfall in January: 1.97"

The month with the highest snowfall is February (2.52").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in January
Cos Cob, CT

Average snowfall days in January - Cos Cob, CT
  • Average snowfall days in January: 7.2 days

The month with the highest number of snowfall days is January (7.2 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
Cos Cob, CT

Average sea temperature in January - Cos Cob, CT
  • Average sea temperature in January: 41.6°F

The best month for swimming (with the highest average sea temperature) is August (73.1°F).
The coldest month (with the lowest average sea temperature) is February (39.5°F).

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Average daylight in January /
Average sunshine in January
Cos Cob, CT

Average daylight in January / Average sunshine in January - Cos Cob, 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 18min).

  • Average sunshine in January: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in January
Cos Cob, CT

Average sunshine days in January - Cos Cob, CT
  • Average sunshine days in January: 17.6 days

The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is June (10.7 days).

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Average UV index in January
Cos Cob, CT

Average UV index in January - Cos Cob, 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
Cos Cob, CT

Average cloud cover in January - Cos Cob, CT
  • Average cloud cover in January: 45

The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in January
Cos Cob, CT

Average visibility in January - Cos Cob, 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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Cos Cob, Connecticut, USA

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