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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, in South Lyme, Connecticut, is another cold winter month, with an average temperature fluctuating between 25.7°F (-3.5°C) and 35.4°F (1.9°C). South Lyme's January weather reaches an average high of 35.4°F (1.9°C) and an average low of 25.7°F (-3.5°C), making it the coldest month. Weather in January »
Weather in February
February, the last month of the winter in South Lyme, is also a wintry month, with an average temperature varying between 37.9°F (3.3°C) and 26.1°F (-3.3°C). The advent of February signifies a minor shift to an average high-temperature of a still wintry 37.9°F (3.3°C), aligning closely with January. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in South Lyme, Connecticut, with temperature in the range of an average high of 43.7°F (6.5°C) and an average low of 32.5°F (0.3°C). In South Lyme, the average high-temperature in March slightly rises, from an icy 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 an average temperature varying between 54.1°F (12.3°C) and 41.7°F (5.4°C). With the onset of April, the average high-temperature slightly shifts from March's chilly 43.7°F (6.5°C) 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 a comfortable month, with temperature in the range of an average high of 64.8°F (18.2°C) and an average low of 50.5°F (10.3°C). May's onset brings a rise in the average high-temperature, moving from a cool 54.1°F (12.3°C) in April to a refreshing 64.8°F (18.2°C). Weather in May »
Weather in June
June, the first month of the summer in South Lyme, is a pleasant month, with an average temperature varying between 72.7°F (22.6°C) and 58.8°F (14.9°C). June brings a slight increase in the average high-temperature, progressing 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 is a warm summer month in South Lyme, Connecticut, with an average temperature varying between 79.5°F (26.4°C) and 66.4°F (19.1°C). With its high average temperature of 79.5°F (26.4°C) and a low of 66.4°F (19.1°C), July is regarded as the warmest month. Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in South Lyme, Connecticut, with an average temperature varying between 65.7°F (18.7°C) and 78.4°F (25.8°C). South Lyme greets August with an average high-temperature of a still moderately hot 78.4°F (25.8°C), marking a slight deviation from the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also an agreeable month in South Lyme, Connecticut, with an average temperature fluctuating between 72.1°F (22.3°C) and 59.7°F (15.4°C). September ushers in a minute temperature change, with average high-temperatures reducing from August's moderately hot 78.4°F (25.8°C) to an agreeable 72.1°F (22.3°C). Weather in September »
Weather in October
October, like September, in South Lyme, Connecticut, is another enjoyable autumn month, with an average temperature fluctuating between 61.7°F (16.5°C) and 50.5°F (10.3°C). The shift from September to October corresponds with a decrease in the average high-temperature, down to an enjoyable 61.7°F (16.5°C) from a pleasant 72.1°F (22.3°C). Weather in October »
Weather in November
November, the last month of the autumn in South Lyme, is also a fresh month, with an average temperature varying between 39.9°F (4.4°C) and 50.9°F (10.5°C). A subtle decrease in the average high-temperature marks November, falling from October's comfortable 61.7°F (16.5°C) to a cool 50.9°F (10.5°C). Weather in November »
Weather in December
December, the first month of the winter in South Lyme, is still a cold month, with an average temperature fluctuating between 32.4°F (0.2°C) and 41.9°F (5.5°C). December brings a decrease in the average high-temperature, shifting from a fresh 50.9°F (10.5°C) in November to an icy 41.9°F (5.5°C). Weather in December »
Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest?
The coldest period tends to be January, when average temperatures fluctuate between a high of 35.4°F (1.9°C) and a low of 25.7°F (-3.5°C).
How much does it rain?
In South Lyme, during the entire year, the rain falls for 110.7 days and collects up to 8.58" (218mm) of precipitation.
When does it snow?
Months with snowfall are January through March, November and December.
How much does it snow?
In South Lyme, during the entire year, snow falls for 18.4 days and aggregates up to 1.69" (43mm) of snow.
When is the lowest UV index?
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 month with the least sunshine?
February and December, with an average of 4.8h of sunshine, are months with the least sunshine.
When does it snow the most?
March is the month with the most snowfall. Snow falls for 3.8 days and accumulates 0.63" (16mm) of snow.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
What is the least humid month?
April is the least humid month in South Lyme, with an average relative humidity of 73%.
When it does not snow?
April through October are months without snowfall.
What are the most humid months in South Lyme?
June and July, with an average relative humidity of 79%, are most humid months.
When are the longest days?
June has the longest days of the year, with an average of 15h and 6min of daylight.
What is the month with the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What are the warmest months?
July is the warmest month, exhibiting average temperatures of 79.5°F (26.4°C) at the peak and 66.4°F (19.1°C) at the base.
What are the months with the most sunshine in South Lyme?
July and August, with an average of 10.6h of sunshine, are months with the most sunshine.
What is the driest month?
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?
December is the month with the most rainfall. Rain falls for 9.5 days and accumulates 0.94" (24mm) of precipitation.
What is the month with the shortest days?
With an average of 9h and 18min of daylight, December has the shortest days of the year.
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).
Average pressure
South Lyme, CT
- Average pressure in January:
30.03"Hg - Average pressure in February:
30.01"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.05"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
South Lyme, CT
- Average wind speed in January:
11.1mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.6mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.5mph - Average wind speed in June:
7.6mph
- Average wind speed in July:
7.2mph - Average wind speed in August:
7.3mph - Average wind speed in September:
8.1mph - Average wind speed in October:
9.7mph - Average wind speed in November:
10.3mph - Average wind speed in December:
10.7mph
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).
Average humidity
South Lyme, CT
The months with the highest relative humidity are June and July (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall
South Lyme, CT
- Average rainfall in January:
0.55" - Average rainfall in February:
0.51" - Average rainfall in March:
0.59" - Average rainfall in April:
0.87" - Average rainfall in May:
0.75" - Average rainfall in June:
0.79"
- Average rainfall in July:
0.83" - Average rainfall in August:
0.71" - Average rainfall in September:
0.35" - Average rainfall in October:
0.87" - Average rainfall in November:
0.83" - Average rainfall in December:
0.94"
The wettest month (with the highest rainfall) is December (0.94").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days
South Lyme, CT
- Average rainfall days in January:
6.8 days - Average rainfall days in February:
6.6 days - Average rainfall days in March:
9.3 days - Average rainfall days in April:
10.1 days - Average rainfall days in May:
11.2 days - Average rainfall days in June:
10 days
- Average rainfall days in July:
11.5 days - Average rainfall days in August:
11.1 days - Average rainfall days in September:
9.1 days - Average rainfall days in October:
8.9 days - Average rainfall days in November:
6.6 days - Average rainfall days in December:
9.5 days
The month with the highest number of rainy days is July (11.5 days).
The months with the least rainy days are February and November (6.6 days).
Average snowfall
South Lyme, CT
The month with the highest snowfall is March (0.63").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
South Lyme, CT
- Average snowfall days in January:
5.4 days - Average snowfall days in February:
4.7 days - Average snowfall days in March:
3.8 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.9 days - Average snowfall days in December:
3.2 days
The month with the highest number of snowfall days is January (5.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight / Average sunshine
South Lyme, CT
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
5h and 1min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 3min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 4min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days
South Lyme, CT
- Average sunshine days in January:
19.3 days - Average sunshine days in February:
18 days - Average sunshine days in March:
19.2 days - Average sunshine days in April:
18.5 days - Average sunshine days in May:
17.1 days - Average sunshine days in June:
17.4 days
- Average sunshine days in July:
15.8 days - Average sunshine days in August:
16.8 days - Average sunshine days in September:
19.3 days - Average sunshine days in October:
19.5 days - Average sunshine days in November:
21.1 days - Average sunshine days in December:
19.7 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is July (15.8 days).
Average UV index
South Lyme, 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).
Average cloud cover
South Lyme, CT
The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility
South Lyme, 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).
South Lyme, Connecticut, USA
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