Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
As Northbrook enters December, the average high-temperature decreases from the a frosty 45.5°F (7.5°C) of November to a wintry 34.9°F (1.6°C). During December, nights in Northbrook cool slightly to an average low of 26.1°F (-3.3°C).Humidity
The average relative humidity in December is 80%.Rainfall
The month with the least rainfall is December, when the rain falls for 9.1 days and typically collects 1.65" (42mm) of precipitation.Snowfall
Months with snowfall in Northbrook are January through May, October through December. In Northbrook, in December, during 10 snowfall days, 2.99" (76mm) of snow is typically accumulated. Throughout the year, in Northbrook, there are 47.6 snowfall days, and 17.8" (452mm) of snow is accumulated.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:00 am and sunset at 4:20 pm. On the last day of December, in Northbrook, sunrise is at 7:19 am and sunset at 4:29 pm CST.
Sunshine
In Northbrook, Illinois, the average sunshine in December is 4h.UV index
The month with the lowest UV index in Northbrook is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The average daily UV index of 1 in December transforms into the following instructions:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Frequently asked questions
How cold is December in Northbrook?
What is the average humidity in December in Northbrook?
What is the driest month in Northbrook?
How much does it rain in Northbrook in December?
How many days does it snow in December in Northbrook?
What is the month with the shortest days in Northbrook?
What is the average length of the day in December in Northbrook?
When is the sunrise / sunset in December in Northbrook?
How many hours of sunshine does Northbrook have in December?
What is the month with the lowest UV index in Northbrook?
What is the UV index reading in December in Northbrook?
Average temperature in December
Northbrook, IL
- Average high temperature in December: 34.9°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in December: 26.1°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
Northbrook, IL
- Average pressure in December: 30.09"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).
Average wind speed in December
Northbrook, IL
- Average wind speed in December: 10.7mph
The windiest month (with the highest average wind speed) is January (11.5mph).
The calmest month (with the lowest average wind speed) is August (7.1mph).
Average humidity in December
Northbrook, IL
- Average humidity in December: 80%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Northbrook, IL
- Average rainfall in December: 1.65"
The wettest months (with the highest rainfall) are May and June (4.57").
The driest month (with the least rainfall) is December (1.65").
Average rainfall days in December
Northbrook, IL
- Average rainfall days in December: 9.1 days
The month with the highest number of rainy days is May (19.1 days).
The month with the least rainy days is February (6.1 days).
Average snowfall in December
Northbrook, IL
- Average snowfall in December: 2.99"
The month with the highest snowfall is January (4.84").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Northbrook, IL
- Average snowfall days in December: 10 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).
Average daylight in December /
Average sunshine in December
Northbrook, IL
- Average daylight in December: 9h and 1min
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 12min).
- Average sunshine in December: 4h and 0min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Northbrook, IL
- Average sunshine days in December: 14.3 days
The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in December
Northbrook, IL
- Average UV index in December: 1
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).
Average cloud cover in December
Northbrook, IL
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in December
Northbrook, IL
- Average visibility in December: 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).
Northbrook, Illinois, USA
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