Climate and monthly weather forecastHarwinton, CT
Climate and monthly weather forecast
Weather in January
January, the same as December, in Harwinton, Connecticut, is a freezing cold winter month, with an average temperature ranging between max 31.3°F (-0.4°C) and min 19.2°F (-7.1°C). January, with its average high-temperature of 31.3°F (-0.4°C) and an average low-temperature of 19.2°F (-7.1°C), holds the record as the coldest month. Weather in January »Weather in February
February, the last month of the winter in Harwinton, is a wintry month, with an average temperature fluctuating between 20.5°F (-6.4°C) and 34.3°F (1.3°C). The weather during February records an average high-temperature of an icy 34.3°F (1.3°C), closely mirroring the preceding month. Weather in February »Weather in March
March, the first month of the spring in Harwinton, is still a cold month, with an average temperature ranging between max 42.4°F (5.8°C) and min 27.9°F (-2.3°C). Harwinton's transition into March is noticed by a slight rise in the average high-temperature, advancing from 34.3°F (1.3°C) in February to a still icy 42.4°F (5.8°C). Weather in March »Weather in April
April is a mild spring month in Harwinton, Connecticut, with an average temperature ranging between max 55.8°F (13.2°C) and min 37.9°F (3.3°C). The average high-temperature increases in April, moving from an icy 42.4°F (5.8°C) in March to a refreshing 55.8°F (13.2°C). Weather in April »Weather in May
The last month of the spring, May, is a refreshing month in Harwinton, Connecticut, with an average temperature varying between 67.5°F (19.7°C) and 48°F (8.9°C). The commencement of May sees a shift in the average high-temperature, moving from a moderate 55.8°F (13.2°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 warm month in Harwinton, Connecticut, with an average temperature ranging between min 55°F (12.8°C) and max 75°F (23.9°C). Harwinton's June weather indicates a minor increase in high-temperatures, edging from May's enjoyable 67.5°F (19.7°C) to a moderately hot 75°F (23.9°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Harwinton, Connecticut, with an average temperature fluctuating between 81.3°F (27.4°C) and 61.3°F (16.3°C). In Harwinton, Connecticut, July is the month with the highest recorded average temperatures, measuring a high of 81.3°F (27.4°C) and a low of 61.3°F (16.3°C). The heat index value during July is evaluated at a tropical 86°F (30°C). Weather in July »Weather in August
August, the last month of the summer in Harwinton, is also a moderately hot month, with an average temperature fluctuating between 59.9°F (15.5°C) and 79.3°F (26.3°C). The average high-temperature for August is a still moderately hot 79.3°F (26.3°C), closely aligning with the temperature of the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is still a pleasant month in Harwinton, Connecticut, with an average temperature fluctuating between 53.4°F (11.9°C) and 72°F (22.2°C). September's arrival subtly correlates with a reduction in the average high-temperature, down from a moderately hot 79.3°F (26.3°C) in August to a pleasant 72°F (22.2°C). Weather in September »Weather in October
October, like September, is another refreshing autumn month in Harwinton, Connecticut, with an average temperature varying between 44.6°F (7°C) and 59.4°F (15.2°C). October indicates a shift in the average high-temperature, from September's pleasant 72°F (22.2°C) to a moderate 59.4°F (15.2°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Harwinton, Connecticut, with an average temperature fluctuating between 46.8°F (8.2°C) and 33.8°F (1°C). In the transition to November, Harwinton observes a drop in the average high-temperature, moving from a moderate 59.4°F (15.2°C) in October to a frosty 46.8°F (8.2°C). Weather in November »Weather in December
December, the first month of the winter in Harwinton, is still a cold month, with an average temperature fluctuating between 25.9°F (-3.4°C) and 36.9°F (2.7°C). The average high-temperature decreases in December, shifting from a chilly 46.8°F (8.2°C) in November to a wintry 36.9°F (2.7°C). Weather in December »Updated: Jul 25, 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
With average temperatures fluctuating between a high of 31.3°F (-0.4°C) and a low of 19.2°F (-7.1°C), January stands out as the coldest month.
In Harwinton, Connecticut, during the entire year, the rain falls for 157.7 days and collects up to 32.72" (831mm) of precipitation.
Months with snowfall are January through May, October through December.
In Harwinton, during the entire year, snow falls for 40 days and aggregates up to 20.55" (522mm) of snow.
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
February is the most humid month, with an average relative humidity of 82%.
February is the month with the most snowfall. Snow falls for 10.3 days and accumulates 5.28" (134mm) of snow.
February has the least sunshine of the year, with an average of 4.4h of sunshine.
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.
With an average relative humidity of 73%, April is the least humid month.
In Harwinton, snow does not fall in June through September.
June has the longest days of the year, with an average of 15h and 12min of daylight.
With an average maximum UV index of 6, June is the month with the highest UV index.
With average high and low temperatures of 81.3°F (27.4°C) and 61.3°F (16.3°C) respectively, July is Harwinton's warmest month.
July and August, with an average of 10.1h of sunshine, are months with the most sunshine in Harwinton.
The month with the least rainfall is September, when the rain falls for 12.4 days and typically collects 2.01" (51mm) of precipitation.
December is the month with the most rainfall in Harwinton. Rain falls for 10.3 days and accumulates 3.35" (85mm) of precipitation.
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Harwinton, CT
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (31.3°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 (19.2°F).
Average pressure
Harwinton, CT
- Average pressure in January:
30.04"Hg - Average pressure in February:
30.01"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
Harwinton, CT
- Average wind speed in January:
8.4mph - Average wind speed in February:
8.2mph - Average wind speed in March:
8.3mph - Average wind speed in April:
7.8mph - Average wind speed in May:
6.4mph - Average wind speed in June:
5.8mph
- Average wind speed in July:
5.2mph - Average wind speed in August:
5.1mph - Average wind speed in September:
5.7mph - Average wind speed in October:
7mph - Average wind speed in November:
7.5mph - Average wind speed in December:
8mph
The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity
Harwinton, CT
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (73%).
Average rainfall
Harwinton, CT
- Average rainfall in January:
2.2" - Average rainfall in February:
2.13" - Average rainfall in March:
2.6" - Average rainfall in April:
3.03" - Average rainfall in May:
2.83" - Average rainfall in June:
2.8"
- Average rainfall in July:
2.99" - Average rainfall in August:
2.64" - Average rainfall in September:
2.01" - Average rainfall in October:
3.27" - Average rainfall in November:
2.87" - Average rainfall in December:
3.35"
The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days
Harwinton, CT
- Average rainfall days in January:
8.2 days - Average rainfall days in February:
8.4 days - Average rainfall days in March:
13.2 days - Average rainfall days in April:
15.6 days - Average rainfall days in May:
16.7 days - Average rainfall days in June:
16.6 days
- Average rainfall days in July:
16.8 days - Average rainfall days in August:
14.8 days - Average rainfall days in September:
12.4 days - Average rainfall days in October:
14.5 days - Average rainfall days in November:
10.2 days - Average rainfall days in December:
10.3 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (8.2 days).
Average snowfall
Harwinton, CT
- Average snowfall in January:
4.25" - Average snowfall in February:
5.28" - Average snowfall in March:
4.61" - Average snowfall in April:
1.3" - Average snowfall in May:
0.12" - Average snowfall in June:
0"
The month with the highest snowfall is February (5.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Harwinton, CT
- Average snowfall days in January:
9.2 days - Average snowfall days in February:
10.3 days - Average snowfall days in March:
8.2 days - Average snowfall days in April:
1.9 days - Average snowfall days in May:
0.2 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:
0.5 days - Average snowfall days in November:
2.5 days - Average snowfall days in December:
7.2 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
Harwinton, CT
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
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 48min - Average sunshine in February:
4h and 24min - Average sunshine in March:
5h and 54min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 12min - Average sunshine in June:
9h and 12min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
10h and 6min - Average sunshine in September:
8h and 30min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 36min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days
Harwinton, CT
- Average sunshine days in January:
16.8 days - Average sunshine days in February:
12.6 days - Average sunshine days in March:
13.4 days - Average sunshine days in April:
12 days - Average sunshine days in May:
12.3 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
12.8 days - Average sunshine days in August:
14.3 days - Average sunshine days in September:
15.7 days - Average sunshine days in October:
13.6 days - Average sunshine days in November:
16.9 days - Average sunshine days in December:
15.7 days
The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is June (11.8 days).
Average UV index
Harwinton, 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
Harwinton, CT
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility
Harwinton, CT
The months with the highest visibility are April, November and December (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September and October (5mi).
