Monthly weather forecast and climate
Cos Cob, CT

Weather in January

January, like December, in Cos Cob, Connecticut, is another cold winter month, with temperature in the range of an average low of 26.1°F (-3.3°C) and an average high of 35.8°F (2.1°C). January is the coldest month, with an average high-temperature of 35.8°F (2.1°C) and an average low-temperature of 26.1°F (-3.3°C). Weather in January »

Weather in February

February, the last month of the winter, in Cos Cob, is another cold month, with average temperature fluctuating between 38.3°F (3.5°C) and 27.7°F (-2.4°C). In February, the average high-temperature is almost the same as in January - a still cold 38.3°F (3.5°C). Weather in February »

Weather in March

The first month of the spring, March, is a chilly month in Cos Cob, Connecticut, with average temperature varying between 33.8°F (1°C) and 45°F (7.2°C). In Cos Cob, the average high-temperature in March slightly increases, from a wintry 38.3°F (3.5°C) in February, to a chilly 45°F (7.2°C). Weather in March »

Weather in April

April is a moderate spring month in Cos Cob, Connecticut, with average temperature fluctuating between 43.5°F (6.4°C) and 55.4°F (13°C). In Cos Cob, the average high-temperature in April rises, from a chilly 45°F (7.2°C) in March, to a mild 55.4°F (13°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Cos Cob, Connecticut, with temperature in the range of an average low of 53.1°F (11.7°C) and an average high of 66.2°F (19°C). In Cos Cob, the average high-temperature in May rises, from a mild 55.4°F (13°C) in April, to an enjoyable 66.2°F (19°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Cos Cob, Connecticut, with average temperature varying between 61.5°F (16.4°C) and 74.7°F (23.7°C). In Cos Cob, the average high-temperature slightly increases, from a comfortable 66.2°F (19°C) in May, to a warm 74.7°F (23.7°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Cos Cob, Connecticut, with average temperature varying between 69.1°F (20.6°C) and 82°F (27.8°C). With an average high-temperature of 82°F (27.8°C) and an average low-temperature of 69.1°F (20.6°C), July is the warmest month. In July, the average heat index is appraised at a hot 87.3°F (30.7°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Cos Cob, Connecticut, with average temperature fluctuating between 68.7°F (20.4°C) and 80.6°F (27°C). In August, the average high-temperature is essentially the same as in July - a still moderately hot 80.6°F (27°C). Weather in August »

Weather in September

September, the first month of the autumn, in Cos Cob, is also a moderately hot month, with temperature in the range of an average low of 61.7°F (16.5°C) and an average high of 73.4°F (23°C). In September, the average high-temperature marginally drops, from 80.6°F (27°C) in August, to a still moderately hot 73.4°F (23°C). Weather in September »

Weather in October

October, like September, in Cos Cob, Connecticut, is another comfortable autumn month, with average temperature fluctuating between 62.4°F (16.9°C) and 51.8°F (11°C). In October, the average high-temperature decreases, from a warm 73.4°F (23°C) in September, to a comfortable 62.4°F (16.9°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cool month in Cos Cob, Connecticut, with average temperature fluctuating between 40.6°F (4.8°C) and 50.9°F (10.5°C). In November, the average high-temperature decreases, from a comfortable 62.4°F (16.9°C) in October, to a fresh 50.9°F (10.5°C). Weather in November »

Weather in December

December, the first month of the winter, in Cos Cob, is still a cold month, with temperature in the range of an average low of 33.3°F (0.7°C) and an average high of 41.9°F (5.5°C). In December, the average high-temperature decreases, from a cool 50.9°F (10.5°C) in November, to a wintry 41.9°F (5.5°C). Weather in December »
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FAQ

What is the coldest month in Cos Cob?

The coldest month is January, with an average high-temperature of 35.8°F (2.1°C) and an average low-temperature of 26.1°F (-3.3°C).

How many days does it rain in Cos Cob?

Throughout the year, there are 165.6 rainfall days, and 37.64" (956mm) of precipitation is accumulated.

What is the driest month in Cos Cob?

Months with the least rainfall in Cos Cob are January and February Rain falls for 7.9 days and accumulates 2.4" (61mm) of rain.

When does it snow in Cos Cob?

Months with snowfall are January through April, November and December.

How many days does it snow in Cos Cob?

In Cos Cob, during the entire year, snow falls for 25.5 days, and aggregates up to 8.78" (223mm) of snow.

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

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

What is the most humid month in Cos Cob?

Months with the highest humidity are February, May and December, with an average relative humidity of 75%.

When does it snow the most in Cos Cob?

The month with the most snowfall in Cos Cob is February when snow falls for 7.1 days and typically aggregates up to 2.52" (64mm) of snow.

What month is the ocean coldest in Cos Cob?

February is the month with the coldest seawater in Cos Cob, with an average ocean temperature of 39.4°F (4.1°C).

What is the month with the least sunshine in Cos Cob?

The month with the least sunshine in Cos Cob, Connecticut, is February, with an average of 4.7h of sunshine.

When it does not snow in Cos Cob?

In Cos Cob snow does not fall in May through October.

When are the longest days in Cos Cob?

With an average of 15.1h of daylight, June has the longest days of the year.

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

Months with the highest UV index in Cos Cob, Connecticut, are June through August, with an average maximum UV index of 6.

What is the warmest month in Cos Cob?

With an average high-temperature of 82°F (27.8°C) and an average low-temperature of 69.1°F (20.6°C), July is the warmest month.

What is the wettest month in Cos Cob?

The month with the most rainfall in Cos Cob, Connecticut, is July when the rain falls for 18.1 days and typically aggregates up to 4.13" (105mm) of precipitation.

What month has the most sunshine in Cos Cob?

With an average of 10.5h of sunshine, July has the most sunshine of the year in Cos Cob.

What is the least humid month in Cos Cob?

The least humid month is August, with an average relative humidity of 71%.

What is the month with the warmest ocean in Cos Cob?

With an average ocean temperature of 73°F (22.8°C), August is the month with the warmest seawater.

What is the month with the shortest days in Cos Cob?

With an average of 9.3h of daylight, December has the shortest days of the year.

Average temperature
Cos Cob, CT

Average temperature - Cos Cob, CT

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).

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
Cos Cob, CT

Average pressure - Cos Cob, CT

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

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Average wind speed
Cos Cob, CT

Average wind speed - Cos Cob, CT

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
Cos Cob, CT

Average humidity - Cos Cob, CT

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
Cos Cob, CT

Average rainfall - Cos Cob, CT

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
Cos Cob, CT

Average rainfall days - Cos Cob, CT

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
Cos Cob, CT

Average snowfall - Cos Cob, CT

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

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Average snowfall days
Cos Cob, CT

Average snowfall days - Cos Cob, CT

The month with the highest number of snowfall days is January (7.2 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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Average sea temperature
Cos Cob, CT

Average sea temperature - Cos Cob, CT

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 / Average sunshine
Cos Cob, CT

Average daylight / Average sunshine - Cos Cob, CT

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.7h).

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Average sunshine days
Cos Cob, CT

Average sunshine days - Cos Cob, CT

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
Cos Cob, CT

Average UV index - Cos Cob, CT

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 visibility
Cos Cob, CT

Average visibility - Cos Cob, CT

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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