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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, the same as December, in Cornwall, Connecticut, is another subzero cold winter month, with an average temperature fluctuating between 18.9°F (-7.3°C) and 30.9°F (-0.6°C). January, having an average high-temperature of 30.9°F (-0.6°C) and an average low-temperature of 18.9°F (-7.3°C), is the coldest month. Weather in January »
Weather in February
February, the last month of the winter in Cornwall, is an icy month, with an average temperature ranging between max 34.3°F (1.3°C) and min 19.8°F (-6.8°C). Cornwall experiences a transition to a cold 34.3°F (1.3°C) in average high-temperatures with the arrival of February, not greatly differing from January's 30.9°F (-0.6°C). Weather in February »
Weather in March
March, the first month of the spring in Cornwall, is also an icy month, with an average temperature ranging between min 27.5°F (-2.5°C) and max 42.3°F (5.7°C). With the beginning of March, Cornwall's average high-temperature sees a minor increase, transitioning from a cold 34.3°F (1.3°C) in February to a still wintry 42.3°F (5.7°C). Weather in March »
Weather in April
April in Cornwall, Connecticut, is a fresh spring month, with temperature in the range of an average high of 55.2°F (12.9°C) and an average low of 37.6°F (3.1°C). In Cornwall, the onset of April comes with an increased average high-temperature, moving from March's icy 42.3°F (5.7°C) to a cool 55.2°F (12.9°C). Weather in April »
Weather in May
May, the last month of the spring in Cornwall, is an enjoyable month, with an average temperature ranging between min 47.7°F (8.7°C) and max 67.5°F (19.7°C). In May, the meteorological conditions change with the average high-temperature moving from a fresh 55.2°F (12.9°C) in April to an enjoyable 67.5°F (19.7°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Cornwall, Connecticut, with an average temperature varying between 54.9°F (12.7°C) and 74.8°F (23.8°C). The arrival of June brings a soft temperature shift, with the average high-temperature nudging from a comfortable 67.5°F (19.7°C) in May to a warm 74.8°F (23.8°C). Weather in June »
Weather in July
July, like June, in Cornwall, Connecticut, is another warm summer month, with an average temperature fluctuating between 81.1°F (27.3°C) and 61.3°F (16.3°C). Cornwall's temperatures peak on average in July, reaching 81.1°F (27.3°C) at their highest and 61.3°F (16.3°C) at their lowest. Throughout July, the heat index is calculated to be a tropical 86°F (30°C). Weather in July »
Weather in August
August, the last month of the summer in Cornwall, is another warm month, with an average temperature varying between 59.4°F (15.2°C) and 79.2°F (26.2°C). August registers an average high-temperature of a still moderately hot 79.2°F (26.2°C), slightly varied from July's 81.1°F (27.3°C). Weather in August »
Weather in September
The first month of the autumn, September, is also an agreeable month in Cornwall, Connecticut, with an average temperature ranging between min 53.4°F (11.9°C) and max 72°F (22.2°C). September ushers in a minor alteration in Cornwall's climate, with the average high-temperature moving from August's moderately hot 79.2°F (26.2°C) to a pleasant 72°F (22.2°C). Weather in September »
Weather in October
October, the same as September, in Cornwall, Connecticut, is a moderate autumn month, with an average temperature ranging between max 59°F (15°C) and min 44.1°F (6.7°C). As October commences, the average high-temperature shows a reduction, transitioning from a pleasant 72°F (22.2°C) in September to a moderate 59°F (15°C). Weather in October »
Weather in November
November, the last month of the autumn in Cornwall, is another chilly month, with an average temperature fluctuating between 46.6°F (8.1°C) and 33.3°F (0.7°C). Cornwall's transition into November involves a shift in temperature, receding from a refreshing 59°F (15°C) in October to a frosty 46.6°F (8.1°C). Weather in November »
Weather in December
December, the first month of the winter in Cornwall, is still a cold month, with an average temperature fluctuating between 36.7°F (2.6°C) and 25.7°F (-3.5°C). Cornwall in December experiences a subtle temperature decline, with average high-temperatures reducing from a frosty 46.6°F (8.1°C) in November to a wintry 36.7°F (2.6°C). Weather in December »
Updated: Jun 28, 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 part of the year is the coldest?
The month of January sees the average lowest temperatures, reaching 30.9°F (-0.6°C) at the peak and 18.9°F (-7.3°C) at the low.
What is the driest month?
January is the month with the least rainfall. Rain falls for 7.7 days and accumulates 2.17" (55mm) of precipitation.
How many days does it rain?
Throughout the year, there are 160.5 rainfall days, and 33.86" (860mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through May, October through December.
How much does it snow?
Throughout the year, in Cornwall, there are 40.2 snowfall days, and 20.39" (518mm) of snow is accumulated.
What is the month with the lowest UV index?
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the most humid month in Cornwall?
The most humid month is February, with an average relative humidity of 82%.
When does it snow the most?
The month with the most snowfall is February, when snow falls for 10.3 days and typically aggregates up to 5.16" (131mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is February, with an average of 4.2h of sunshine.
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?
With an average relative humidity of 74%, April is the least humid month.
When it does not snow?
In Cornwall, snow does not fall in June through September.
When are the longest days?
June has the longest days of the year, with an average of 15h and 12min of daylight.
What is the month with the highest UV index?
The month with the highest UV index is June, with an average maximum UV index of 6.
What is the warmest month?
The average temperatures reach their apex in July, averaging 81.1°F (27.3°C) at the high end and 61.3°F (16.3°C) at the low end.
What is the rainiest month?
The month with the most rainfall is July, when the rain falls for 17.9 days and typically aggregates up to 3.54" (90mm) of precipitation.
What month has the most sunshine?
July has the most sunshine of the year, with an average of 10.1h of sunshine.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 12min of daylight.
Average temperature
Cornwall, CT
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (30.9°F).
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure
Cornwall, CT
- Average pressure in January:
30.04"Hg - Average pressure in February:
30.02"Hg - Average pressure in March:
30.05"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:
30.06"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Cornwall, CT
- Average wind speed in January:
8mph - Average wind speed in February:
7.8mph - Average wind speed in March:
8mph - Average wind speed in April:
7.6mph - Average wind speed in May:
6.2mph - Average wind speed in June:
5.6mph
- Average wind speed in July:
5mph - Average wind speed in August:
5mph - Average wind speed in September:
5.5mph - Average wind speed in October:
6.8mph - Average wind speed in November:
7.2mph - Average wind speed in December:
7.5mph
The windiest months (with the highest average wind speed) are January and March (8mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity
Cornwall, CT
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (74%).
Average rainfall
Cornwall, CT
- Average rainfall in January:
2.17" - Average rainfall in February:
2.2" - Average rainfall in March:
2.44" - Average rainfall in April:
2.95" - Average rainfall in May:
3.03" - Average rainfall in June:
3.07"
- Average rainfall in July:
3.54" - Average rainfall in August:
2.87" - Average rainfall in September:
2.24" - Average rainfall in October:
3.15" - Average rainfall in November:
2.83" - Average rainfall in December:
3.35"
The wettest month (with the highest rainfall) is July (3.54").
The driest month (with the least rainfall) is January (2.17").
Average rainfall days
Cornwall, CT
- Average rainfall days in January:
7.7 days - Average rainfall days in February:
8.2 days - Average rainfall days in March:
12.4 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
16.9 days - Average rainfall days in June:
17.5 days
- Average rainfall days in July:
17.9 days - Average rainfall days in August:
16.3 days - Average rainfall days in September:
13.5 days - Average rainfall days in October:
13 days - Average rainfall days in November:
10.9 days - Average rainfall days in December:
10.9 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (7.7 days).
Average snowfall
Cornwall, CT
- Average snowfall in January:
4.57" - Average snowfall in February:
5.16" - Average snowfall in March:
4.09" - Average snowfall in April:
0.87" - Average snowfall in May:
0.24" - Average snowfall in June:
0"
The month with the highest snowfall is February (5.16").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Cornwall, CT
- Average snowfall days in January:
9.3 days - Average snowfall days in February:
10.3 days - Average snowfall days in March:
8.4 days - Average snowfall days in April:
1.4 days - Average snowfall days in May:
0.3 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:
0.6 days - Average snowfall days in November:
2.8 days - Average snowfall days in December:
7.1 days
The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Cornwall, CT
- Average daylight in January:
9h and 3min - 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 4min - 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 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
4h and 4min - Average sunshine in February:
4h and 1min - Average sunshine in March:
5h and 5min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 1min - Average sunshine in June:
9h and 1min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 0min - Average sunshine in September:
8h and 3min - Average sunshine in October:
5h and 3min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days
Cornwall, CT
- Average sunshine days in January:
16.8 days - Average sunshine days in February:
13.1 days - Average sunshine days in March:
12.8 days - Average sunshine days in April:
12.8 days - Average sunshine days in May:
12 days - Average sunshine days in June:
10.8 days
- Average sunshine days in July:
11.3 days - Average sunshine days in August:
12.2 days - Average sunshine days in September:
14.7 days - Average sunshine days in October:
15.5 days - Average sunshine days in November:
16.6 days - Average sunshine days in December:
14.8 days
The month with the most sunshine days is January (16.8 days).
The month with the least sunshine days is June (10.8 days).
Average UV index
Cornwall, CT
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Cornwall, CT
The month with the most cloud cover is February (Cloud cover 53).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility
Cornwall, CT
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Cornwall, Connecticut, USA
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