Collinsville
Connecticut, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Collinsville, CT

January, like December, in Collinsville, Connecticut, is a wintry winter month, with average temperature fluctuating between 32°F (0°C) and 20.1°F (-6.6°C). The coldest month is January, with an average high-temperature of 32°F (0°C) and an average low-temperature of 20.1°F (-6.6°C). Weather in January »

February, the last month of the winter, in Collinsville, is also a wintry month, with average temperature fluctuating between 20.7°F (-6.3°C) and 35.2°F (1.8°C). In February, the average high-temperature is essentially the same as in January - a still wintry 35.2°F (1.8°C). Weather in February »

March, the first month of the spring, in Collinsville, is a chilly month, with average temperature varying between 42.8°F (6°C) and 28.8°F (-1.8°C). In Collinsville, the average high-temperature in March slightly increases, from a cold 35.2°F (1.8°C) in February, to a frosty 42.8°F (6°C). Weather in March »

April is a mild spring month in Collinsville, Connecticut, with temperature in the range of an average low of 38.8°F (3.8°C) and an average high of 56.1°F (13.4°C). In Collinsville, Connecticut, the average high-temperature rises, from a frosty 42.8°F (6°C) in March, to a mild 56.1°F (13.4°C). Weather in April »

The last month of the spring, May, is a comfortable month in Collinsville, Connecticut, with average temperature fluctuating between 48.7°F (9.3°C) and 67.6°F (19.8°C). In May, the average high-temperature increases, from a mild 56.1°F (13.4°C) in April, to a comfortable 67.6°F (19.8°C). Weather in May »

The first month of the summer, June, is a warm month in Collinsville, Connecticut, with average temperature ranging between max 75.6°F (24.2°C) and min 56.5°F (13.6°C). In June, the average high-temperature marginally rises, from an enjoyable 67.6°F (19.8°C) in May, to a moderately hot 75.6°F (24.2°C). Weather in June »

July, like June, in Collinsville, Connecticut, is another warm summer month, with average temperature varying between 63.1°F (17.3°C) and 82.2°F (27.9°C). With an average high-temperature of 82.2°F (27.9°C) and an average low-temperature of 63.1°F (17.3°C), July is the warmest month. The average heat index is estimated at a hot 88°F (31.1°C). Weather in July »

The last month of the summer, August, is another warm month in Collinsville, Connecticut, with temperature in the range of an average low of 61.5°F (16.4°C) and an average high of 80.2°F (26.8°C). In August, the average high-temperature is relatively the same as in July - a still moderately hot 80.2°F (26.8°C). Weather in August »

The first month of the autumn, September, is still a pleasant month in Collinsville, Connecticut, with average temperature varying between 72.9°F (22.7°C) and 54.7°F (12.6°C). In September, the average high-temperature slightly decreases, from a moderately hot 80.2°F (26.8°C) in August, to an agreeable 72.9°F (22.7°C). Weather in September »

October, like September, is another mild autumn month in Collinsville, Connecticut, with average temperature fluctuating between 45.5°F (7.5°C) and 60.1°F (15.6°C). In Collinsville, the average high-temperature drops, from a pleasant 72.9°F (22.7°C) in September, to a mild 60.1°F (15.6°C). Weather in October »

November, the last month of the autumn, in Collinsville, is also a frosty month, with average temperature fluctuating between 48.2°F (9°C) and 34.9°F (1.6°C). In Collinsville, the average high-temperature decreases, from a moderate 60.1°F (15.6°C) in October, to a chilly 48.2°F (9°C). Weather in November »

December, the first month of the winter, in Collinsville, is still a cold month, with average temperature fluctuating between 26.8°F (-2.9°C) and 37.6°F (3.1°C). In Collinsville, the average high-temperature decreases, from a chilly 48.2°F (9°C) in November, to a wintry 37.6°F (3.1°C). Weather in December »

What is the coldest month in Collinsville?

January is the coldest month, with an average high-temperature of 32°F (0°C) and an average low-temperature of 20.1°F (-6.6°C).

How many days does it rain in Collinsville?

In Collinsville, Connecticut, during the entire year, the rain falls for 159.6 days and collects up to 31.97" (812mm) of precipitation.

When does it snow in Collinsville?

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

How many days does it snow in Collinsville?

Throughout the year, there are 33.1 snowfall days, and 18.39" (467mm) of snow is accumulated.

What are the months with the lowest UV index in Collinsville?

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 Collinsville?

The most humid month in Collinsville, Connecticut, is February, with an average relative humidity of 80%.

When does it snow the most in Collinsville?

February is the month with the most snowfall in Collinsville. Snow falls for 8.9 days and accumulates 5.24" (133mm) of snow.

What is the month with the least sunshine in Collinsville?

With an average of 4.6h of sunshine, February has the least sunshine of the year in Collinsville, Connecticut.

What is the least humid month in Collinsville?

With an average relative humidity of 71%, April is the least humid month in Collinsville, Connecticut.

When it does not snow in Collinsville?

In Collinsville snow does not fall in June through September.

When are the longest days in Collinsville?

The month with the longest days in Collinsville, Connecticut, is June, with an average of 15.2h of daylight.

What are the months with the highest UV index in Collinsville?

Months with the highest UV index are June and July, with an average maximum UV index of 6.

What is the warmest month in Collinsville?

July is the warmest month, with an average high-temperature of 82.2°F (27.9°C) and an average low-temperature of 63.1°F (17.3°C).

What is the month with the most sunshine in Collinsville?

July and August, with an average of 10.3h of sunshine, are months with the most sunshine in Collinsville, Connecticut.

What is the driest month in Collinsville?

September is the month with the least rainfall in Collinsville. Rain falls for 12.6 days and accumulates 1.97" (50mm) of precipitation.

What is the rainiest month in Collinsville?

December is the month with the most rainfall in Collinsville. Rain falls for 10.5 days and accumulates 3.43" (87mm) of precipitation.

What is the month with the shortest days in Collinsville?

December has the shortest days of the year in Collinsville, Connecticut, with an average of 9.2h of daylight.
Average temperature - Collinsville, CT
Average humidity - Collinsville, CT
Average rainfall - Collinsville, CT

The wettest month (with the highest rainfall) is December (3.43").
The driest month (with the least rainfall) is September (1.97").

Average rainfall days - Collinsville, CT

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (9.4 days).

Average snowfall - Collinsville, CT
Average snowfall days - Collinsville, CT

The month with the highest number of snowfall days is February (8.9 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine - Collinsville, 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: 10.3h).
The month with the least sunshine is February (Average sunshine: 4.6h).

Average UV index - Collinsville, CT