Monthly weather forecast and climate
Harwinton, CT

Weather in January

January, like December, is a freezing cold winter month in Harwinton, Connecticut, with average temperature fluctuating between 19.2°F (-7.1°C) and 31.3°F (-0.4°C). With an average high-temperature of 31.3°F (-0.4°C) and an average low-temperature of 19.2°F (-7.1°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter, in Harwinton, is a wintry month, with average temperature ranging between min 20.5°F (-6.4°C) and max 34.3°F (1.3°C). In Harwinton, Connecticut, the average high-temperature is almost the same as in January - a cold 34.3°F (1.3°C). Weather in February »

Weather in March

The first month of the spring, March, is also a wintry month in Harwinton, Connecticut, with average temperature fluctuating between 27.9°F (-2.3°C) and 42.4°F (5.8°C). In March, the average high-temperature marginally rises, from a cold 34.3°F (1.3°C) in February, to a still wintry 42.4°F (5.8°C). Weather in March »

Weather in April

April is a mild spring month in Harwinton, Connecticut, with temperature in the range of an average high of 55.8°F (13.2°C) and an average low of 37.9°F (3.3°C). In April, the average high-temperature increases, from a cold 42.4°F (5.8°C) in March, to a moderate 55.8°F (13.2°C). Weather in April »

Weather in May

May, the last month of the spring, in Harwinton, is an enjoyable month, with average temperature varying between 67.5°F (19.7°C) and 48°F (8.9°C). In Harwinton, the average high-temperature rises, from a mild 55.8°F (13.2°C) in April, to a comfortable 67.5°F (19.7°C). Weather in May »

Weather in June

June, the first month of the summer, in Harwinton, is a warm month, with temperature in the range of an average low of 55°F (12.8°C) and an average high of 75°F (23.9°C). In Harwinton, the average high-temperature marginally rises, from a comfortable 67.5°F (19.7°C) in May, to a moderately hot 75°F (23.9°C). Weather in June »

Weather in July

July, like June, in Harwinton, Connecticut, is a moderately hot summer month, with average temperature fluctuating between 81.3°F (27.4°C) and 61.3°F (16.3°C). The warmest month is July, with an average high-temperature of 81.3°F (27.4°C) and an average low-temperature of 61.3°F (16.3°C). The average heat index is calculated to a tropical 86.5°F (30.3°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Harwinton, Connecticut, with average temperature fluctuating between 79.3°F (26.3°C) and 59.9°F (15.5°C). In Harwinton, the average high-temperature is relatively the same as in July - a still warm 79.3°F (26.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Harwinton, Connecticut, with average temperature ranging between min 53.4°F (11.9°C) and max 72°F (22.2°C). In September, the average high-temperature slightly decreases, from a moderately hot 79.3°F (26.3°C) in August, to an agreeable 72°F (22.2°C). Weather in September »

Weather in October

October, like September, is another mild autumn month in Harwinton, Connecticut, with average temperature ranging between min 44.6°F (7°C) and max 59.4°F (15.2°C). In Harwinton, the average high-temperature drops, from a pleasant 72°F (22.2°C) in September, to a mild 59.4°F (15.2°C). Weather in October »

Weather in November

November, the last month of the autumn, in Harwinton, is also a frosty month, with average temperature fluctuating between 33.8°F (1°C) and 46.8°F (8.2°C). In November, the average high-temperature decreases, 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

The first month of the winter, December, is also a wintry month in Harwinton, Connecticut, with average temperature ranging between min 25.9°F (-3.4°C) and max 36.9°F (2.7°C). In December, the average high-temperature drops, from a chilly 46.8°F (8.2°C) in November, to a wintry 36.9°F (2.7°C). Weather in December »
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FAQ

What is the coldest month in Harwinton?

With an average high-temperature of 31.3°F (-0.4°C) and an average low-temperature of 19.2°F (-7.1°C), January is the coldest month.

How many days does it rain in Harwinton?

Throughout the year, in Harwinton, Connecticut, there are 157.7 rainfall days, and 32.72" (831mm) of precipitation is accumulated.

When does it snow in Harwinton?

January through May, October through December are months with snowfall.

How much does it snow in Harwinton?

Throughout the year, in Harwinton, Connecticut, there are 40 snowfall days, and 20.55" (522mm) of snow is accumulated.

When is the lowest UV index in Harwinton?

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

What is the most humid month in Harwinton?

The most humid month in Harwinton is February, with an average relative humidity of 82%.

What is the snowiest month in Harwinton?

The month with the most snowfall in Harwinton, Connecticut, is February when snow falls for 10.3 days and typically aggregates up to 5.28" (134mm) of snow.

What is the month with the least sunshine in Harwinton?

With an average of 4.4h of sunshine, February has the least sunshine of the year in Harwinton.

What is the least humid month in Harwinton?

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

When it does not snow in Harwinton?

June through September are months without snowfall in Harwinton, Connecticut.

When are the longest days in Harwinton?

June has the longest days of the year in Harwinton, Connecticut, with an average of 15.2h of daylight.

What is the month with the highest UV index in Harwinton?

June is the month with the highest UV index in Harwinton, with an average maximum UV index of 6.

What is the warmest month in Harwinton?

July is the warmest month, with an average high-temperature of 81.3°F (27.4°C) and an average low-temperature of 61.3°F (16.3°C).

What are the months with the most sunshine in Harwinton?

Months with the most sunshine are July and August, with an average of 10.1h of sunshine.

What is the driest month in Harwinton?

September is the month with the least rainfall in Harwinton, Connecticut. Rain falls for 12.4 days and accumulates 2.01" (51mm) of precipitation.

What is the rainiest month in Harwinton?

December is the month with the most rainfall in Harwinton. Rain falls for 10.3 days and accumulates 3.35" (85mm) of precipitation.

What is the month with the shortest days in Harwinton?

With an average of 9.2h of daylight, December has the shortest days of the year in Harwinton, Connecticut.

Average temperature
Harwinton, CT

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).

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Average pressure
Harwinton, CT

Average pressure - Harwinton, CT

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed
Harwinton, CT

Average wind speed - Harwinton, CT

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).

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Average rainfall
Harwinton, CT

Average rainfall - Harwinton, CT

The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (2.01").

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Average rainfall days
Harwinton, CT

Average rainfall days - Harwinton, CT

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).

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Average snowfall
Harwinton, CT

Average snowfall - Harwinton, CT

The month with the highest snowfall is February (5.28").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Harwinton, CT

Average snowfall days - Harwinton, CT

The month with the highest number of snowfall days is February (10.3 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Harwinton, CT

Average daylight / Average sunshine - Harwinton, CT

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

Months with the most sunshine are July and August (Average sunshine: 10.1h).
The month with the least sunshine is February (Average sunshine: 4.4h).

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Average sunshine days
Harwinton, CT

Average sunshine days - Harwinton, CT

The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is June (11.8 days).

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Average UV index
Harwinton, CT

Average UV index - Harwinton, CT

The month with the highest UV index is June (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average visibility
Harwinton, CT

Average visibility - Harwinton, CT

Months with the highest visibility are April, November and December (6mi).
Months with the lowest visibility are January, February, March, May, June, July, August, September and October (5mi).

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