January weather forecast
Prospect Heights, IL

Weather in January

January, the same as December, in Prospect Heights, Illinois, is another subzero cold winter month, with an average temperature ranging between min 18°F (-7.8°C) and max 28.2°F (-2.1°C).

Temperature

With an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 18°F (-7.8°C), January is the coldest month.

Humidity

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

Rainfall

In Prospect Heights, during 7 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. In Prospect Heights, during the entire year, the rain falls for 153.3 days and collects up to 30.12" (765mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Prospect Heights. The month with the most snowfall is January, when snow falls for 11.8 days and typically aggregates up to 4.96" (126mm) of snow.

Daylight

In Prospect Heights, Illinois, the average length of the day in January is 9h and 32min.
On the first day of January in Prospect Heights, sunrise is at 7:20 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 5:05 pm CST.

Sunshine

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

UV index

The average daily maximum UV index in January in Prospect Heights is 2. A UV Index of 2, and less, symbolizes a low threat to health 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:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Prospect Heights?

With an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 18°F (-7.8°C), January is the coldest month.

What are the most humid months in Prospect Heights?

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

What is the average humidity in January in Prospect Heights?

The average relative humidity in January in Prospect Heights, Illinois, is 82%.

How much does it rain in Prospect Heights in January?

In Prospect Heights, Illinois, during January, the rain falls for 7 days and regularly aggregates up to 1.65" (42mm) of precipitation.

When does it snow the most in Prospect Heights?

January is the month with the most snowfall. Snow falls for 11.8 days and accumulates 4.96" (126mm) of snow.

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

In Prospect Heights, Illinois, in January, during 11.8 snowfall days, 4.96" (126mm) of snow is typically accumulated.

How many hours of daylight does Prospect Heights have in January?

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

When are sunrise and sunset in January in Prospect Heights?

On the first day of January in Prospect Heights, Illinois, sunrise is at 7:20 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 5:05 pm CST.

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

The month with the least sunshine is January, with an average of 3.7h of sunshine.

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

The average sunshine duration in January is 3.7h.

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

In Prospect Heights, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to UV radiation.

Average temperature in January
Prospect Heights, IL

Average temperature in January - Prospect Heights, IL
  • Average high temperature in January: 28.2°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 (28.2°F).

  • Average low temperature in January: 18°F

The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (18°F).

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Average pressure in January
Prospect Heights, IL

Average pressure in January - Prospect 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
Prospect Heights, IL

Average wind speed in January - Prospect Heights, IL
  • Average wind speed in January: 10.4mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

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Average humidity in January
Prospect Heights, IL

Average humidity in January - Prospect 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 (72%).

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Average rainfall in January
Prospect Heights, IL

Average rainfall in January - Prospect Heights, IL
  • Average rainfall in January: 1.65"

The wettest month (with the highest rainfall) is May (3.9").
The driest month (with the least rainfall) is December (1.46").

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Average rainfall days in January
Prospect Heights, IL

Average rainfall days in January - Prospect Heights, IL
  • Average rainfall days in January: 7 days

The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is February (5.6 days).

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Average snowfall in January
Prospect Heights, IL

Average snowfall in January - Prospect Heights, IL
  • Average snowfall in January: 4.96"

The month with the highest snowfall is January (4.96").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Prospect Heights, IL

Average snowfall days in January - Prospect Heights, IL
  • Average snowfall days in January: 11.8 days

The month with the highest number of snowfall days is January (11.8 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
Prospect Heights, IL

Average daylight in January / Average sunshine in January - Prospect 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: 3.7h

The month with the most sunshine is July (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 3.7h).

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Average sunshine days in January
Prospect Heights, IL

Average sunshine days in January - Prospect Heights, IL
  • Average sunshine days in January: 13.6 days

The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is June (10.7 days).

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Average UV index in January
Prospect Heights, IL

Average UV index in January - Prospect 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
Prospect Heights, IL

Average cloud cover in January - Prospect Heights, IL
  • Average cloud cover in January: 61

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in January
Prospect Heights, IL

Average visibility in January - Prospect Heights, IL
  • Average visibility in January: 6mi

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

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