January weather forecast
Cornwall, CT

Weather in January

January, like December, is a freezing cold winter month in Cornwall, Connecticut, with temperature in the range of an average high of 30.9°F (-0.6°C) and an average low of 18.9°F (-7.3°C).

Temperature

January is the coldest month, with an average high-temperature of 30.9°F (-0.6°C) and an average low-temperature of 18.9°F (-7.3°C).

Humidity

In January, the average relative humidity is 79%.

Rainfall

January is the month with the least rainfall in Cornwall. Rain falls for 7.7 days and accumulates 2.17" (55mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In January, it is snowing for 9.3 days. Throughout January, 4.57" (116mm) of snow is accumulated. Throughout the year, in Cornwall, there are 40.2 snowfall days, and 20.39" (518mm) of snow is accumulated.

Daylight

The average length of the day in January in Cornwall is 9h and 33min.
On the first day of January in Cornwall, Connecticut, sunrise is at 7:20 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:07 pm EST.

Sunshine

In January, the average sunshine is 4.7h.

UV index

The months with the lowest UV index in Cornwall are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Cornwall?

January is the coldest month, with an average high-temperature of 30.9°F (-0.6°C) and an average low-temperature of 18.9°F (-7.3°C).

What is the average humidity in January in Cornwall?

In Cornwall, the average relative humidity in January is 79%.

What is the driest month in Cornwall?

The month with the least rainfall is January, when the rain falls for 7.7 days and typically collects 2.17" (55mm) of precipitation.

How many days does it rain in January in Cornwall?

In Cornwall, Connecticut, in January, during 7.7 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.

How much does it snow in Cornwall in January?

In Cornwall, Connecticut, in January, during 9.3 snowfall days, 4.57" (116mm) of snow is typically accumulated.

How many hours of daylight does Cornwall have in January?

In Cornwall, the average day length in January is 9h and 33min.

When is the sunrise / sunset in January in Cornwall?

In January, on the first day of the month, sunrise is at 7:20 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:07 pm EST.

How many hours of sunshine does Cornwall have in January?

In January, the average sunshine duration in Cornwall is 4.7h.

When is the lowest UV index in Cornwall?

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

How high is the UV index in January in Cornwall?

The average daily maximum UV index in January in Cornwall is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Cornwall, CT

Average temperature in January - Cornwall, CT
  • Average high temperature in January: 30.9°F

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).

  • Average low temperature in January: 18.9°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).

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Average pressure in January
Cornwall, CT

Average pressure in January - Cornwall, CT
  • Average pressure in January: 30.04"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).

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Average wind speed in January
Cornwall, CT

Average wind speed in January - Cornwall, CT
  • Average wind speed in January: 8mph

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).

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Average humidity in January
Cornwall, CT

Average humidity in January - Cornwall, CT
  • Average humidity in January: 79%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (74%).

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Average rainfall in January
Cornwall, CT

Average rainfall in January - Cornwall, CT
  • Average rainfall in January: 2.17"

The wettest month (with the highest rainfall) is July (3.54").
The driest month (with the least rainfall) is January (2.17").

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Average rainfall days in January
Cornwall, CT

Average rainfall days in January - Cornwall, CT
  • Average rainfall days in January: 7.7 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).

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Average snowfall in January
Cornwall, CT

Average snowfall in January - Cornwall, CT
  • Average snowfall in January: 4.57"

The month with the highest snowfall is February (5.16").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Cornwall, CT

Average snowfall days in January - Cornwall, CT
  • Average snowfall days in January: 9.3 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).

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Average daylight in January /
Average sunshine in January
Cornwall, CT

Average daylight in January / Average sunshine in January - Cornwall, CT
  • Average daylight in January: 9h and 33min

The month with the longest days is June (Average daylight: 15h and 10min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in January: 4h and 42min

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).

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Average sunshine days in January
Cornwall, CT

Average sunshine days in January - Cornwall, CT
  • Average sunshine days in January: 16.8 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).

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Average UV index in January
Cornwall, CT

Average UV index in January - Cornwall, CT
  • Average UV index in January: 2

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).

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Average cloud cover in January
Cornwall, CT

Average cloud cover in January - Cornwall, CT
  • Average cloud cover in January: 49

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).

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Average visibility in January
Cornwall, CT

Average visibility in January - Cornwall, CT
  • Average visibility in January: 5mi

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).

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