Monthly weather forecast and climate
South Lyme, CT

Weather in January

January, like December, in South Lyme, Connecticut, is another cold winter month, with average temperature fluctuating between 35.4°F (1.9°C) and 25.7°F (-3.5°C). 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. Weather in January »

Weather in February

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

Weather in March

March, the first month of the spring, in South Lyme, is a frosty month, with average temperature varying between 43.7°F (6.5°C) and 32.5°F (0.3°C). In March, the average high-temperature marginally rises, from a cold 37.9°F (3.3°C) in February, to a frosty 43.7°F (6.5°C). Weather in March »

Weather in April

April is a cool spring month in South Lyme, Connecticut, with average temperature varying between 54.1°F (12.3°C) and 41.7°F (5.4°C). In April, the average high-temperature increases, from a chilly 43.7°F (6.5°C) in March, to a fresh 54.1°F (12.3°C). Weather in April »

Weather in May

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

Weather in June

The first month of the summer, June, is an agreeable month in South Lyme, Connecticut, with temperature in the range of an average high of 72.7°F (22.6°C) and an average low of 58.8°F (14.9°C). In South Lyme, the average high-temperature slightly increases, from an enjoyable 64.8°F (18.2°C) in May, to a pleasant 72.7°F (22.6°C). Weather in June »

Weather in July

July in South Lyme, Connecticut, is a moderately hot summer month, with average temperature varying between 66.4°F (19.1°C) and 79.5°F (26.4°C). The warmest month is July, with an average high-temperature of 79.5°F (26.4°C) and an average low-temperature of 66.4°F (19.1°C). Weather in July »

Weather in August

August, the last month of the summer, in South Lyme, is another warm month, with average temperature ranging between max 78.4°F (25.8°C) and min 65.7°F (18.7°C). In South Lyme, the average high-temperature is almost 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 South Lyme, Connecticut, with average temperature ranging between max 72.1°F (22.3°C) and min 59.7°F (15.4°C). In September, the average high-temperature slightly decreases, from a warm 78.4°F (25.8°C) in August, to an agreeable 72.1°F (22.3°C). Weather in September »

Weather in October

October, like September, in South Lyme, Connecticut, is another comfortable autumn month, with average temperature ranging between min 50.5°F (10.3°C) and max 61.7°F (16.5°C). In October, the average high-temperature drops, from a pleasant 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 South Lyme, Connecticut, with average temperature ranging between max 50.9°F (10.5°C) and min 39.9°F (4.4°C). In South Lyme, the average high-temperature drops, from a comfortable 61.7°F (16.5°C) in October, to a cool 50.9°F (10.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in South Lyme, Connecticut, with average temperature varying between 41.9°F (5.5°C) and 32.4°F (0.2°C). In South Lyme, Connecticut, 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 »
[Resources]

FAQ

What is the coldest month in South Lyme?

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

How many days does it rain in South Lyme?

In South Lyme, Connecticut, during the entire year, the rain falls for 110.7 days and collects up to 8.58" (218mm) of precipitation.

When does it snow in South Lyme?

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

How much does it snow in South Lyme?

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

When is the lowest UV index in South Lyme?

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

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

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

When does it snow the most in South Lyme?

March is the month with the most snowfall in South Lyme. Snow falls for 3.8 days and accumulates 0.63" (16mm) of snow.

What is the least humid month in South Lyme?

With an average relative humidity of 73%, April is the least humid month in South Lyme.

When it does not snow in South Lyme?

In South Lyme snow does not fall in April through October.

What are the most humid months in South Lyme?

Months with the highest humidity in South Lyme, Connecticut, are June and July, with an average relative humidity of 79%.

When are the longest days in South Lyme?

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

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

Months with the highest UV index in South Lyme are June through August, with an average maximum UV index of 6.

What is the warmest month in South 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 South Lyme.

What is the month with the most sunshine in South Lyme?

July and August, with an average of 10.6h of sunshine, are months with the most sunshine in South Lyme, Connecticut.

What is the driest month in South 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 wettest month in South Lyme?

The month with the most rainfall in South 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 South Lyme?

The month with the shortest days is December, with an average of 9.2h of daylight.

Average temperature
South Lyme, CT

Average temperature - South 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).

[Resources]

Average pressure
South Lyme, CT

Average pressure - South Lyme, CT

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

[Resources]

Average wind speed
South Lyme, CT

Average wind speed - South 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).

[Resources]

Average humidity
South Lyme, CT

Average humidity - South Lyme, CT

Months with the highest relative humidity are June and July (79%).
The month with the lowest relative humidity is April (73%).

[Resources]

Average rainfall
South Lyme, CT

Average rainfall - South Lyme, CT

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

[Resources]

Average rainfall days
South Lyme, CT

Average rainfall days - South 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).

[Resources]

Average snowfall
South Lyme, CT

Average snowfall - South 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").

[Resources]

Average snowfall days
South Lyme, CT

Average snowfall days - South 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).

[Resources]

Average daylight / Average sunshine
South Lyme, CT

Average daylight / Average sunshine - South 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).

[Resources]

Average sunshine days
South Lyme, CT

Average sunshine days - South 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).

[Resources]

Average UV index
South Lyme, CT

Average UV index - South 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).

[Resources]

Average visibility
South Lyme, CT

Average visibility - South 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).

[Resources]