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
A change in temperatures is noted as November gives way to December, with average highs reducing from a frosty 45.9°F (7.7°C) to a wintry 34.7°F (1.5°C). An average low-temperature of 25.2°F (-3.8°C) is anticipated throughout the nights in Hillside during December.Humidity
In Hillside, the average relative humidity in December is 81%.Rainfall
December is the month with the least rainfall. Rain falls for 7.9 days and accumulates 1.14" (29mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Hillside. In Hillside, Illinois, in December, snow falls for 9.9 days, with typically accumulated 2.24" (57mm) of snow. Throughout the year, in Hillside, there are 45.8 snowfall days, and 14.25" (362mm) of snow is accumulated.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Hillside.On the first day of December, sunrise is at 7:00 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:30 pm CST.
Sunshine
The average sunshine in December is 4.1h.UV index
The months with the lowest UV index 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 unsafe exposure to UV radiation for ordinary individuals.Note: An average UV index of 1 in December transforms into this advice:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Always opt for UVA and UVB-resistant sunglasses on radiant days. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Hillside?
What is the average humidity in December in Hillside?
What is the driest month in Hillside?
How much does it rain in Hillside in December?
How much does it snow in Hillside in December?
What is the month with the shortest days in Hillside?
What is the average length of the day in December in Hillside?
When is the sunrise / sunset in December in Hillside?
How many hours of sunshine does Hillside have in December?
When is the lowest UV index in Hillside?
What is the UV index intensity in December in Hillside?
Average temperature in December
Hillside, IL
- Average high temperature in December: 34.7°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in December: 25.2°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in December
Hillside, 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
Hillside, IL
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in December
Hillside, IL
- Average humidity in December: 81%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Hillside, IL
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is December (1.14").
Average rainfall days in December
Hillside, IL
- Average rainfall days in December: 7.9 days
The months with the highest number of rainy days are May and July (17.3 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in December
Hillside, IL
- Average snowfall in December: 2.24"
The month with the highest snowfall is February (3.86").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Hillside, IL
- Average snowfall days in December: 9.9 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Hillside, 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 1min
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).
Average sunshine days in December
Hillside, IL
- Average sunshine days in December: 15.3 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in December
Hillside, IL
- Average UV index in December: 1
The months with the highest UV index are June, 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
Hillside, IL
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Hillside, 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).
Hillside, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location