Climate and monthly weather forecast
Old Greenwich, CT

Weather in January

January, the same as December, is a wintry winter month in Old Greenwich, Connecticut, with an average temperature varying between 26.2°F (-3.2°C) and 36°F (2.2°C). The coldest month is January, with an average high-temperature of 36°F (2.2°C) and an average low-temperature of 26.2°F (-3.2°C). Weather in January »

Weather in February

February, the last month of the winter in Old Greenwich, is another cold month, with an average temperature ranging between min 27.7°F (-2.4°C) and max 38.5°F (3.6°C). In February, the average high-temperature is essentially the same as in January - a still wintry 38.5°F (3.6°C). Weather in February »

Weather in March

March, the first month of the spring in Old Greenwich, is a chilly month, with an average temperature varying between 45°F (7.2°C) and 34.2°F (1.2°C). In Old Greenwich, the average high-temperature in March marginally rises from a cold 38.5°F (3.6°C) in February to a chilly 45°F (7.2°C). Weather in March »

Weather in April

April in Old Greenwich, Connecticut, is a mild spring month, with an average temperature ranging between max 55.4°F (13°C) and min 43.5°F (6.4°C). In Old Greenwich, the average high-temperature in April 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 Old Greenwich, is an enjoyable month, with an average temperature fluctuating between 65.8°F (18.8°C) and 53.2°F (11.8°C). In Old Greenwich, the average high-temperature in May increases from a mild 55.4°F (13°C) in April to an enjoyable 65.8°F (18.8°C). Weather in May »

Weather in June

June, the first month of the summer in Old Greenwich, is a moderately hot month, with an average temperature varying between 74.7°F (23.7°C) and 61.7°F (16.5°C). In June, the average high-temperature marginally rises from an enjoyable 65.8°F (18.8°C) in May to a moderately hot 74.7°F (23.7°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Old Greenwich, Connecticut, with an average temperature fluctuating between 69.3°F (20.7°C) and 81.9°F (27.7°C). July is the warmest month, with an average high-temperature of 81.9°F (27.7°C) and an average low-temperature of 69.3°F (20.7°C). The average heat index in July is computed to be a tropical 86.9°F (30.5°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Old Greenwich, Connecticut, with an average temperature varying between 80.4°F (26.9°C) and 68.9°F (20.5°C). In August, the average high-temperature is essentially the same as in July - a still moderately hot 80.4°F (26.9°C). Weather in August »

Weather in September

September, the first month of the autumn in Old Greenwich, is still a pleasant month, with an average temperature ranging between min 61.7°F (16.5°C) and max 73.2°F (22.9°C). In September, the average high-temperature slightly decreases from a moderately hot 80.4°F (26.9°C) in August to a pleasant 73.2°F (22.9°C). Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Old Greenwich, Connecticut, with temperature in the range of an average high of 62.4°F (16.9°C) and an average low of 52°F (11.1°C). In October, the average high-temperature drops from an agreeable 73.2°F (22.9°C) in September to an enjoyable 62.4°F (16.9°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cool month in Old Greenwich, Connecticut, with temperature in the range of an average high of 50.9°F (10.5°C) and an average low of 40.8°F (4.9°C). In Old Greenwich, the average high-temperature in November decreases from an enjoyable 62.4°F (16.9°C) in October to a cool 50.9°F (10.5°C). Weather in November »

Weather in December

December, the first month of the winter in Old Greenwich, is also a wintry month, with an average temperature ranging between min 33.4°F (0.8°C) and max 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 Old Greenwich?

With an average high-temperature of 36°F (2.2°C) and an average low-temperature of 26.2°F (-3.2°C), January is the coldest month in Old Greenwich.

What is the driest month in Old Greenwich?

January is the month with the least rainfall in Old Greenwich. Rain falls for 8.6 days and accumulates 2.44" (62mm) of precipitation.

How much does it rain in Old Greenwich?

In Old Greenwich, during the entire year, the rain falls for 166.6 days and collects up to 38.07" (967mm) of precipitation.

When does it snow in Old Greenwich?

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

How much does it snow in Old Greenwich?

In Old Greenwich, during the entire year, snow falls for 24.8 days and aggregates up to 9.33" (237mm) of snow.

When is the lowest UV index in Old Greenwich?

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

What are the most humid months in Old Greenwich?

The months with the highest humidity in Old Greenwich are February, May, June and December, with an average relative humidity of 75%.

What is the snowiest month in Old Greenwich?

The month with the most snowfall in Old Greenwich, Connecticut, is February, when snow falls for 7.3 days and typically aggregates up to 2.6" (66mm) of snow.

When is the ocean coldest in Old Greenwich?

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

What is the month with the least sunshine in Old Greenwich?

February and December, with an average of 4.7h of sunshine, are months with the least sunshine in Old Greenwich, Connecticut.

When is Daylight Saving Time (DST) in Old Greenwich?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Old Greenwich, Connecticut, 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 Old Greenwich?

May through October are months without snowfall in Old Greenwich.

When are the longest days in Old Greenwich?

June has the longest days of the year in Old Greenwich, Connecticut, with an average of 15h and 5min of daylight.

What are the months with the highest UV index in Old Greenwich?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the warmest month in Old Greenwich?

With an average high-temperature of 81.9°F (27.7°C) and an average low-temperature of 69.3°F (20.7°C), July is the warmest month.

What is the rainiest month in Old Greenwich?

July is the month with the most rainfall. Rain falls for 17.8 days and accumulates 4.13" (105mm) of precipitation.

What month has the most sunshine in Old Greenwich?

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

What is the least humid month in Old Greenwich?

With an average relative humidity of 71%, August is the least humid month in Old Greenwich.

When is the ocean warmest in Old Greenwich?

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

What is the month with the shortest days in Old Greenwich?

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

Average temperature
Old Greenwich, CT

Average temperature - Old Greenwich, CT

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (36°F).

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

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Average pressure
Old Greenwich, CT

Average pressure - Old Greenwich, CT

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed
Old Greenwich, CT

Average wind speed - Old Greenwich, CT

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

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Average humidity
Old Greenwich, CT

Average humidity - Old Greenwich, CT

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

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Average rainfall
Old Greenwich, CT

Average rainfall - Old Greenwich, CT

The wettest month (with the highest rainfall) is July (4.13").
The driest month (with the least rainfall) is January (2.44").

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Average rainfall days
Old Greenwich, CT

Average rainfall days - Old Greenwich, CT

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.6 days).

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Average snowfall
Old Greenwich, CT

Average snowfall - Old Greenwich, CT

The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days
Old Greenwich, CT

Average snowfall days - Old Greenwich, CT

The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature
Old Greenwich, CT

Average sea temperature - Old Greenwich, 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
Old Greenwich, CT

Average daylight / Average sunshine - Old Greenwich, 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 months with the least sunshine are February and December (Average sunshine: 4h and 42min).

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Average sunshine days
Old Greenwich, CT

Average sunshine days - Old Greenwich, CT

The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index
Old Greenwich, CT

Average UV index - Old Greenwich, 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
Old Greenwich, CT

Average visibility - Old Greenwich, 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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