Climate and monthly weather forecast
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). With an average high-temperature of 35.8°F (2.1°C) and an average low-temperature of 26.1°F (-3.3°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Cos Cob, is also a wintry month, with temperature in the range of an average low of 27.7°F (-2.4°C) and an average high of 38.3°F (3.5°C). In Cos Cob, Connecticut, the average high-temperature in February is practically the same as in January - a still wintry 38.3°F (3.5°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Cos Cob, Connecticut, with an average temperature fluctuating between 45°F (7.2°C) and 33.8°F (1°C). In Cos Cob, Connecticut, 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 in Cos Cob, Connecticut, is a moderate spring month, with an average temperature varying between 55.4°F (13°C) and 43.5°F (6.4°C). In April, the average high-temperature increases from a frosty 45°F (7.2°C) in March to a moderate 55.4°F (13°C). Weather in April »

Weather in May

May, the last month of the spring in Cos Cob, is a comfortable month, with an average temperature ranging between min 53.1°F (11.7°C) and max 66.2°F (19°C). In May, the average high-temperature increases from a moderate 55.4°F (13°C) in April to a comfortable 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 an average temperature ranging between min 61.5°F (16.4°C) and max 74.7°F (23.7°C). In June, the average high-temperature marginally rises 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 an average temperature fluctuating between 82°F (27.8°C) and 69.1°F (20.6°C). July is the warmest month, with an average high-temperature of 82°F (27.8°C) and an average low-temperature of 69.1°F (20.6°C). The average heat index in July is evaluated at a tropical 87.8°F (31°C). Weather in July »

Weather in August

August, the last month of the summer in Cos Cob, is also a moderately hot month, with an average temperature ranging between max 80.6°F (27°C) and min 68.7°F (20.4°C). In August, the average high-temperature is almost the same as in July - a still warm 80.6°F (27°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Cos Cob, Connecticut, with an average temperature varying between 61.7°F (16.5°C) and 73.4°F (23°C). In September, the average high-temperature slightly decreases from a warm 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 an average temperature varying between 62.4°F (16.9°C) and 51.8°F (11°C). In Cos Cob, the average high-temperature in October drops from a warm 73.4°F (23°C) in September to an enjoyable 62.4°F (16.9°C). Weather in October »

Weather in November

November, the last month of the autumn in Cos Cob, is also a fresh month, with temperature in the range of an average high of 50.9°F (10.5°C) and an average low of 40.6°F (4.8°C). In November, the average high-temperature decreases from an enjoyable 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 also a wintry 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 drops from a fresh 50.9°F (10.5°C) in November to a cold 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 in Cos Cob, Connecticut, 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).

What is the driest month in Cos Cob?

The months with the least rainfall are January and February Rain falls for 7.9 days and accumulates 2.4" (61mm) of rain.

How much does it rain in Cos Cob?

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

When does it snow in Cos Cob?

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

How many days does it snow in Cos Cob?

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

When is 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 most humid month in Cos Cob?

The months with the highest humidity in Cos Cob, Connecticut, are February, May and December, with an average relative humidity of 75%.

What is the snowiest month in Cos Cob?

The month with the most snowfall 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?

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

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

The month with the least sunshine is February, with an average of 4.7h of sunshine.

When is Daylight Saving Time (DST) in Cos Cob?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from EDT to EST.

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?

The month with the longest days in Cos Cob, Connecticut, is June, with an average of 15h and 5min of daylight.

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

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

What is the warmest month in Cos Cob?

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

What is the rainiest month in Cos Cob?

The month with the most rainfall in Cos Cob 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, Connecticut.

What is the least humid month in Cos Cob?

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

What month is the ocean warmest in Cos Cob?

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

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

December has the shortest days of the year in Cos Cob, with an average of 9h and 17min of daylight.

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

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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

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
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").
The 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).
The 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: 15h and 5min).
The month with the shortest days is December (Average daylight: 9h and 17min).

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
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

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 visibility
Cos Cob, CT

Average visibility - Cos Cob, CT

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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