January weather forecast
Somonauk, IL

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Weather in January

January, the same as December, in Somonauk, Illinois, is a freezing cold winter month, with temperature in the range of an average low of 15.6°F (-9.1°C) and an average high of 27.5°F (-2.5°C).

Temperature

The coldest temperatures occur during January, when averages reach a peak of 27.5°F (-2.5°C) and a low of 15.6°F (-9.1°C).

Humidity

In Somonauk, the average relative humidity in January is 84%.

Rainfall

The month with the least rainfall in Somonauk is January, when the rain falls for 5.5 days and typically collects 1.69" (43mm) of precipitation.

Snowfall

Months with snowfall in Somonauk are January through April, October through December. January is the month with the most snowfall. Snow falls for 12.3 days and accumulates 4.61" (117mm) of snow.

Daylight

In Somonauk, the average length of the day in January is 9h and 34min.
On the first day of the month, sunrise is at 7:21 am and sunset at 4:34 pm. On the last day of January, sunrise is at 7:07 am and sunset at 5:08 pm CST.

Sunshine

With an average of 3.9h of sunshine, January has the least sunshine of the year in Somonauk.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: In January, a regular UV index of 1 translates into these guidelines:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. During bright days, sunglasses that offer UVA and UVB defense are recommended. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
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Frequently asked questions

What month is the coldest in Somonauk?

Somonauk's coldest month, January, generally records average temperatures ranging from a high of 27.5°F (-2.5°C) to a low of 15.6°F (-9.1°C).

How cold is it in Somonauk in January?

In January, in Somonauk, the average high-temperature is 27.5°F (-2.5°C), and the average low-temperature is 15.6°F (-9.1°C).

What is the average humidity in January in Somonauk?

In January, the average relative humidity in Somonauk, Illinois, is 84%.

What is the driest month in Somonauk?

The month with the least rainfall in Somonauk, Illinois, is January, when the rain falls for 5.5 days and typically collects 1.69" (43mm) of precipitation.

How many days does it rain in January in Somonauk?

In Somonauk, in January, during 5.5 rainfall days, 1.69" (43mm) of precipitation is typically accumulated.

What is the snowiest month in Somonauk?

January is the month with the most snowfall. Snow falls for 12.3 days and accumulates 4.61" (117mm) of snow.

How many days does it snow in January in Somonauk?

In Somonauk, Illinois, in January, snow falls for 12.3 days, with typically accumulated 4.61" (117mm) of snow.

How many hours of daylight does Somonauk have in January?

In January, the average day length is 9h and 34min.

When is the sunrise / sunset in January in Somonauk?

In January, on the first day of the month, sunrise is at 7:21 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 5:08 pm CST.

What is the month with the least sunshine in Somonauk?

With an average of 3.9h of sunshine, January has the least sunshine of the year in Somonauk.

How long on average sun shines in January in Somonauk?

In Somonauk, the average sunshine duration in January is 3.9h.

What is the month with the lowest UV index in Somonauk?

The months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the UV index intensity in January in Somonauk?

In Somonauk, Illinois, the average daily maximum UV index in January is 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Somonauk, IL

Average temperature in January - Somonauk, IL
  • Average high temperature in January: 27.5°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (27.5°F).

  • Average low temperature in January: 15.6°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).

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Average pressure in January
Somonauk, IL

Average pressure in January - Somonauk, IL
  • Average pressure in January: 30.12"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in January
Somonauk, IL

Average wind speed in January - Somonauk, IL
  • Average wind speed in January: 9.8mph

The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity in January
Somonauk, IL

Average humidity in January - Somonauk, IL
  • Average humidity in January: 84%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (74%).

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Average rainfall in January
Somonauk, IL

Average rainfall in January - Somonauk, IL
  • Average rainfall in January: 1.69"

The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is January (1.69").

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Average rainfall days in January
Somonauk, IL

Average rainfall days in January - Somonauk, IL
  • Average rainfall days in January: 5.5 days

The months with the highest number of rainy days are June and July (19.3 days).
The month with the least rainy days is January (5.5 days).

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Average snowfall in January
Somonauk, IL

Average snowfall in January - Somonauk, IL
  • Average snowfall in January: 4.61"

The month with the highest snowfall is January (4.61").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in January
Somonauk, IL

Average snowfall days in January - Somonauk, IL
  • Average snowfall days in January: 12.3 days

The month with the highest number of snowfall days is January (12.3 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
Somonauk, IL

Average daylight in January / Average sunshine in January - Somonauk, IL
  • Average daylight in January: 9h and 4min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in January: 3h and 5min

The months with the most sunshine are June, July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

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Average sunshine days in January
Somonauk, IL

Average sunshine days in January - Somonauk, IL
  • Average sunshine days in January: 15.4 days

The month with the most sunshine days is November (17 days).
The month with the least sunshine days is July (8.2 days).

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Average UV index in January
Somonauk, IL

Average UV index in January - Somonauk, IL
  • Average UV index in January: 1

The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in January
Somonauk, IL

Average cloud cover in January - Somonauk, IL
  • Average cloud cover in January: 60

The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).

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Average visibility in January
Somonauk, IL

Average visibility in January - Somonauk, IL
  • Average visibility in January: 5mi

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

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Somonauk, Illinois, USA

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