January weather forecast
Arlington Heights, IL

Weather in January

January, the same as December, in Arlington Heights, Illinois, is a freezing cold winter month, with temperature in the range of an average low of 17.4°F (-8.1°C) and an average high of 27.9°F (-2.3°C).

Temperature

With an average high-temperature of 27.9°F (-2.3°C) and an average low-temperature of 17.4°F (-8.1°C), January is the coldest month.

Humidity

The months with the highest humidity in Arlington Heights are January and February, with an average relative humidity of 82%.

Rainfall

In Arlington Heights, Illinois, it is raining for 6.6 days, with typically 1.73" (44mm) of accumulated precipitation. In Arlington Heights, Illinois, during the entire year, the rain falls for 142.7 days and collects up to 27.91" (709mm) of precipitation.

Snowfall

Months with snowfall in Arlington Heights are January through May, October through December. In Arlington Heights, during January, snow falls for 13.1 days and regularly aggregates up to 5.67" (144mm) of snow. In Arlington Heights, during the entire year, snow falls for 48.8 days and aggregates up to 21.02" (534mm) of snow.

Daylight

In January, the average length of the day in Arlington Heights is 9h and 32min.
On the first day of the month, sunrise is at 7:20 am and sunset at 4:31 pm. On the last day of January, in Arlington Heights, Illinois, sunrise is at 7:05 am and sunset at 5:05 pm CST.

Sunshine

January has the least sunshine of the year, with an average of 3.7h of sunshine.

UV index

In Arlington Heights, the average daily maximum UV index in January is 2. 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, the average maximum UV index of 2 translate into the following recommendations:
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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Arlington Heights?

With an average high-temperature of 27.9°F (-2.3°C) and an average low-temperature of 17.4°F (-8.1°C), January is the coldest month.

What is the temperature in January in Arlington Heights?

The average high-temperature, in January, in Arlington Heights, is 27.9°F (-2.3°C), while the average low-temperature is 17.4°F (-8.1°C).

What are the most humid months in Arlington Heights?

January and February, with an average relative humidity of 82%, are most humid months in Arlington Heights.

What is the average humidity in January in Arlington Heights?

In Arlington Heights, the average relative humidity in January is 82%.

How many days does it rain in January in Arlington Heights?

In January, in Arlington Heights, the rain falls for 6.6 days. Throughout January, 1.73" (44mm) of precipitation is accumulated.

How many days does it snow in January in Arlington Heights?

In January, in Arlington Heights, Illinois, it is snowing for 13.1 days. Throughout January, 5.67" (144mm) of snow is accumulated.

What is the average length of the day in January in Arlington Heights?

In Arlington Heights, the average day length in January is 9h and 32min.

When are sunrise and sunset in January in Arlington Heights?

In January, on the first day of the month, sunrise is at 7:20 am and sunset at 4:31 pm. On the last day of the month, in Arlington Heights, sunrise is at 7:05 am and sunset at 5:05 pm CST.

What is the month with the least sunshine in Arlington Heights?

With an average of 3.7h of sunshine, January has the least sunshine of the year.

How many hours of sunshine does Arlington Heights have in January?

The average sunshine duration in January in Arlington Heights is 3.7h.

What is the UV index reading in January in Arlington Heights?

The average daily maximum UV index in January in Arlington Heights is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.
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
Arlington Heights, IL

Average temperature in January - Arlington Heights, IL
  • Average high temperature in January: 27.9°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 (27.9°F).

  • Average low temperature in January: 17.4°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

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Average pressure in January
Arlington Heights, IL

Average pressure in January - Arlington Heights, IL
  • Average pressure in January: 30.11"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in January
Arlington Heights, IL

Average wind speed in January - Arlington Heights, IL
  • Average wind speed in January: 10.1mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

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Average humidity in January
Arlington Heights, IL

Average humidity in January - Arlington Heights, IL
  • Average humidity in January: 82%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in January
Arlington Heights, IL

Average rainfall in January - Arlington Heights, IL
  • Average rainfall in January: 1.73"

The wettest months (with the highest rainfall) are April and May (3.46").
The driest month (with the least rainfall) is November (1.57").

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Average rainfall days in January
Arlington Heights, IL

Average rainfall days in January - Arlington Heights, IL
  • Average rainfall days in January: 6.6 days

The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is February (5.8 days).

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Average snowfall in January
Arlington Heights, IL

Average snowfall in January - Arlington Heights, IL
  • Average snowfall in January: 5.67"

The month with the highest snowfall is February (5.71").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Arlington Heights, IL

Average snowfall days in January - Arlington Heights, IL
  • Average snowfall days in January: 13.1 days

The month with the highest number of snowfall days is January (13.1 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
Arlington Heights, IL

Average daylight in January / Average sunshine in January - Arlington Heights, IL
  • Average daylight in January: 9h and 32min

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 10min).

  • Average sunshine in January: 3h and 42min

The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in January
Arlington Heights, IL

Average sunshine days in January - Arlington Heights, IL
  • Average sunshine days in January: 13.3 days

The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is February (10.3 days).

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Average UV index in January
Arlington Heights, IL

Average UV index in January - Arlington Heights, IL
  • Average UV index in January: 2

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in January
Arlington Heights, IL

Average cloud cover in January - Arlington Heights, IL
  • Average cloud cover in January: 62

The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 30).

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Average visibility in January
Arlington Heights, IL

Average visibility in January - Arlington Heights, IL
  • Average visibility in January: 5mi

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

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