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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 Old Lyme, Connecticut, is a wintry winter month, with an average temperature varying between 35.4°F (1.9°C) and 25.7°F (-3.5°C). January, with an average high of 35.4°F (1.9°C) and a low of 25.7°F (-3.5°C), signifies the coldest month of the year. Weather in January »
Weather in February
February, the last month of the winter in Old Lyme, is also a wintry month, with an average temperature ranging between min 26.1°F (-3.3°C) and max 37.9°F (3.3°C). The average high-temperature in February, at a still icy 37.9°F (3.3°C), reveals a modest deviation from January's 35.4°F (1.9°C). Weather in February »
Weather in March
March, the first month of the spring in Old Lyme, is a frosty month, with an average temperature ranging between min 32.5°F (0.3°C) and max 43.7°F (6.5°C). In March, the meteorological conditions subtly change with the average high-temperature edging 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 is a cool spring month in Old Lyme, Connecticut, 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). As Old Lyme, Connecticut, enters April, the average high-temperature increases from the a frosty 43.7°F (6.5°C) of March to a fresh 54.1°F (12.3°C). Weather in April »
Weather in May
May, the last month of the spring in Old Lyme, is an enjoyable 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). The start of May is characterized by an increase in the average high-temperature, transitioning from a fresh 54.1°F (12.3°C) in April to a refreshing 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 an average temperature varying between 58.8°F (14.9°C) and 72.7°F (22.6°C). A slight uplift in the average high-temperature marks June, adjusting from May's enjoyable 64.8°F (18.2°C) to a pleasant 72.7°F (22.6°C). Weather in June »
Weather in July
July in Old Lyme, Connecticut, is a moderately hot summer month, with an average temperature varying between 79.5°F (26.4°C) and 66.4°F (19.1°C). Old Lyme's warmest month, July, generally records average temperatures ranging from a high of 79.5°F (26.4°C) to a low of 66.4°F (19.1°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Old Lyme, Connecticut, with temperature in the range of an average low of 65.7°F (18.7°C) and an average high of 78.4°F (25.8°C). Transitioning into August, Old Lyme experiences an average high-temperature of a still warm 78.4°F (25.8°C), marking a minor shift from the preceding month. 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). A subtle shift in Old Lyme's weather is observed as August turns into September, with the average high temperature reducing from a warm 78.4°F (25.8°C) to a pleasant 72.1°F (22.3°C). Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Old Lyme, Connecticut, with temperature in the range of an average low of 50.5°F (10.3°C) and an average high of 61.7°F (16.5°C). Old Lyme's October weather shows a moderate shift in high-temperatures, falling from September's agreeable 72.1°F (22.3°C) to a refreshing 61.7°F (16.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Old Lyme, is also a fresh month, with an average temperature fluctuating between 50.9°F (10.5°C) and 39.9°F (4.4°C). A change in temperatures is noted as October gives way to November, with average highs reducing from an enjoyable 61.7°F (16.5°C) to a fresh 50.9°F (10.5°C). Weather in November »
Weather in December
The first month of the winter, December, is also an icy month in Old Lyme, Connecticut, with an average temperature ranging between min 32.4°F (0.2°C) and max 41.9°F (5.5°C). Old Lyme's December weather features a mild decline in high-temperatures, reducing from a cool 50.9°F (10.5°C) in November to an icy 41.9°F (5.5°C). Weather in December »
Updated: Jul 15, 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 is the coldest time of year?
January, known for its average high temperature of 35.4°F (1.9°C) and an average low temperature of 25.7°F (-3.5°C), is the coldest month in Old Lyme.
How many days does it rain?
In Old 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?
January through March, November and December are months with snowfall.
How much does it snow?
Throughout the year, there are 18.4 snowfall days, and 1.69" (43mm) of snow is accumulated.
What are the months with 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 are the months with the least sunshine?
The months with the least sunshine are February and December, with an average of 4.8h of 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?
The least humid month is April, with an average relative humidity of 73%.
When it does not snow?
In Old Lyme, snow does not fall in April through October.
What is the most humid month?
The months with the highest humidity are June and July, with an average relative humidity of 79%.
When are the longest days in Old Lyme?
June has the longest days of the year, with an average of 15h and 6min of daylight.
When is 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?
The warmest period tends to be July, when average temperatures fluctuate between a high of 79.5°F (26.4°C) and a low of 66.4°F (19.1°C).
What are the months with the most sunshine?
July and August, with an average of 10.6h of sunshine, are months with the most sunshine.
What is the driest month?
September is the month with the least rainfall. Rain falls for 9.1 days and accumulates 0.35" (9mm) of precipitation.
What is the rainiest 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
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).
Average pressure
Old 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
Old 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
Old 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
Old 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
Old 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
Old 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
Old 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
Old 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
Old 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
Old 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
Old 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
Old 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).
Old Lyme, Connecticut, USA
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