Monthly weather forecast and climate
Old Lyme, CT

Weather in January

January, the same as December, is another cold winter month in Old Lyme, Connecticut, with temperature in the range of an average high of 35.4°F (1.9°C) and an average low of 25.7°F (-3.5°C). January is the coldest month, with an average high-temperature of 35.4°F (1.9°C) and an average low-temperature of 25.7°F (-3.5°C). Weather in January »

Weather in February

February, the last month of the winter, in Old Lyme, is also a wintry month, with average temperature ranging between max 37.9°F (3.3°C) and min 26.1°F (-3.3°C). In February, the average high-temperature is almost the same as in January - a still wintry 37.9°F (3.3°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Old Lyme, Connecticut, with average temperature fluctuating between 32.5°F (0.3°C) and 43.7°F (6.5°C). In March, the average high-temperature slightly increases, from a cold 37.9°F (3.3°C) in February, to a chilly 43.7°F (6.5°C). Weather in March »

Weather in April

April in Old Lyme, Connecticut, is a cool spring month, with temperature in the range of an average low of 41.7°F (5.4°C) and an average high of 54.1°F (12.3°C). In Old Lyme, the average high-temperature increases, from a frosty 43.7°F (6.5°C) in March, to a cool 54.1°F (12.3°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Old Lyme, Connecticut, with average temperature ranging between min 50.5°F (10.3°C) and max 64.8°F (18.2°C). In May, the average high-temperature rises, from a cool 54.1°F (12.3°C) in April, to a comfortable 64.8°F (18.2°C). Weather in May »

Weather in June

The first month of the summer, June, is an agreeable month in Old Lyme, Connecticut, with average temperature varying between 58.8°F (14.9°C) and 72.7°F (22.6°C). In June, the average high-temperature marginally rises, from an enjoyable 64.8°F (18.2°C) in May, to an agreeable 72.7°F (22.6°C). Weather in June »

Weather in July

July is a warm summer month in Old Lyme, Connecticut, with average temperature fluctuating between 79.5°F (26.4°C) and 66.4°F (19.1°C). With an average high-temperature of 79.5°F (26.4°C) and an average low-temperature of 66.4°F (19.1°C), July is the warmest month. Weather in July »

Weather in August

August, the last month of the summer, in Old Lyme, is another warm month, with average temperature varying between 78.4°F (25.8°C) and 65.7°F (18.7°C). In August, the average high-temperature is relatively the same as in July - a still warm 78.4°F (25.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Old Lyme, Connecticut, with temperature in the range of an average low of 59.7°F (15.4°C) and an average high of 72.1°F (22.3°C). In Old Lyme, the average high-temperature in September marginally drops, from a moderately hot 78.4°F (25.8°C) in August, to an agreeable 72.1°F (22.3°C). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in Old Lyme, Connecticut, with average temperature varying between 61.7°F (16.5°C) and 50.5°F (10.3°C). In October, the average high-temperature decreases, from an agreeable 72.1°F (22.3°C) in September, to an enjoyable 61.7°F (16.5°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cool month in Old Lyme, Connecticut, with average temperature ranging between min 39.9°F (4.4°C) and max 50.9°F (10.5°C). In November, the average high-temperature drops, from a comfortable 61.7°F (16.5°C) in October, to a fresh 50.9°F (10.5°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cold month in Old Lyme, Connecticut, with average temperature fluctuating between 41.9°F (5.5°C) and 32.4°F (0.2°C). In Old Lyme, the average high-temperature decreases, 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 Old Lyme?

With an average high-temperature of 35.4°F (1.9°C) and an average low-temperature of 25.7°F (-3.5°C), January is the coldest month.

How many days does it rain in Old Lyme?

Throughout the year, there are 110.7 rainfall days, and 8.58" (218mm) of precipitation is accumulated.

When does it snow in Old Lyme?

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

How much does it snow in Old Lyme?

Throughout the year, in Old Lyme, there are 18.4 snowfall days, and 1.69" (43mm) of snow is accumulated.

What is the month with the lowest UV index in Old Lyme?

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

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

Months with the least sunshine are February and December, with an average of 4.8h of sunshine.

What is the snowiest month in Old Lyme?

The month with the most snowfall in Old Lyme is March when snow falls for 3.8 days and typically aggregates up to 0.63" (16mm) of snow.

What is the least humid month in Old Lyme?

The least humid month is April, with an average relative humidity of 73%.

When it does not snow in Old Lyme?

April through October are months without snowfall in Old Lyme, Connecticut.

What are the most humid months in Old Lyme?

June and July, with an average relative humidity of 79%, are most humid months.

When are the longest days in Old Lyme?

The month with the longest days is June, with an average of 15.1h of daylight.

What is the month with the highest UV index in Old Lyme?

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

What is the warmest month in Old Lyme?

With an average high-temperature of 79.5°F (26.4°C) and an average low-temperature of 66.4°F (19.1°C), July is the warmest month in Old Lyme, Connecticut.

What are the months with the most sunshine in Old Lyme?

Months with the most sunshine are July and August, with an average of 10.6h of sunshine.

What is the driest month in Old Lyme?

The month with the least rainfall is September when the rain falls for 9.1 days and typically collects 0.35" (9mm) of precipitation.

What is the rainiest month in Old Lyme?

The month with the most rainfall in Old Lyme, Connecticut, is December when the rain falls for 9.5 days and typically aggregates up to 0.94" (24mm) of precipitation.

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

December has the shortest days of the year, with an average of 9.2h of daylight.

Average temperature
Old Lyme, CT

Average temperature - Old Lyme, CT

The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (35.4°F).

The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).

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Average pressure
Old Lyme, CT

Average pressure - Old Lyme, CT

The month with the highest atmospheric pressure is November (30.08").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed
Old Lyme, CT

Average wind speed - Old Lyme, CT

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).

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Average rainfall
Old Lyme, CT

Average rainfall - Old Lyme, CT

The wettest month (with the highest rainfall) is December (0.94").
The driest month (with the least rainfall) is September (0.35").

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Average rainfall days
Old Lyme, CT

Average rainfall days - Old Lyme, CT

The month with the highest number of rainy days is July (11.5 days).
Months with the least rainy days are February and November (6.6 days).

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Average snowfall
Old Lyme, CT

Average snowfall - Old Lyme, CT

The month with the highest snowfall is March (0.63").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days
Old Lyme, CT

Average snowfall days - Old Lyme, CT

The month with the highest number of snowfall days is January (5.4 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Old Lyme, CT

Average daylight / Average sunshine - Old Lyme, CT

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.2h).

Months with the most sunshine are July and August (Average sunshine: 10.6h).
Months with the least sunshine are February and December (Average sunshine: 4.8).

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Average sunshine days
Old Lyme, CT

Average sunshine days - Old Lyme, CT

The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is July (15.8 days).

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Average UV index
Old Lyme, CT

Average UV index - Old Lyme, 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
Old Lyme, CT

Average visibility - Old Lyme, 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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