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
Observing a mild shift, the average high-temperature during December reduces from November's chilly 45.1°F (7.3°C) to a wintry 33.6°F (0.9°C). During December, Grandwood Park records an average temperature of 23.9°F (-4.5°C) at night.Humidity
In December, the average relative humidity is 81%.Rainfall
The month with the least rainfall is December, when the rain falls for 8.2 days and typically collects 0.98" (25mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Grandwood Park, in December, snow falls for 10.4 days, with typically accumulated 2.17" (55mm) of snow. In Grandwood Park, Illinois, during the entire year, snow falls for 49.5 days and aggregates up to 13.54" (344mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year in Grandwood Park.On the first day of the month, sunrise is at 7:02 am and sunset at 4:20 pm. On the last day of December, in Grandwood Park, sunrise is at 7:21 am and sunset at 4:29 pm CST.
Sunshine
In Grandwood Park, the average sunshine in December is 4h.UV index
The months with the lowest UV index in Grandwood Park are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: In December, the UV index of 1 transforms into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Frequently asked questions
How cold is it in Grandwood Park in December?
What is the average humidity in December in Grandwood Park?
What is the driest month in Grandwood Park?
How many days does it rain in December in Grandwood Park?
How many days does it snow in December in Grandwood Park?
What is the month with the shortest days in Grandwood Park?
How many hours of daylight does Grandwood Park have in December?
When are sunrise and sunset in December in Grandwood Park?
How long on average sun shines in December in Grandwood Park?
What is the month with the lowest UV index in Grandwood Park?
How high is the UV index in December in Grandwood Park?
Average temperature in December
Grandwood Park, IL
- Average high temperature in December: 33.6°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (27.5°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in December
Grandwood Park, IL
- Average pressure in December: 30.09"Hg
The months with the highest atmospheric pressure are January and February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Grandwood Park, IL
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Grandwood Park, IL
- Average humidity in December: 81%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Grandwood Park, IL
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is April (2.72").
The driest month (with the least rainfall) is December (0.98").
Average rainfall days in December
Grandwood Park, IL
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is July (17.5 days).
The month with the least rainy days is February (5 days).
Average snowfall in December
Grandwood Park, IL
- Average snowfall in December: 2.17"
The month with the highest snowfall is January (3.58").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Grandwood Park, IL
- Average snowfall days in December: 10.4 days
The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Grandwood Park, 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 6min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Grandwood Park, IL
- Average sunshine days in December: 15.4 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Grandwood Park, IL
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Grandwood Park, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July, August and September (Cloud cover 30).
Average visibility in December
Grandwood Park, IL
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Grandwood Park, Illinois, USA
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