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
The onset of December is marked by a decrease in temperature, transitioning from a cool 53.2°F (11.8°C) in November to a chilly 42.8°F (6°C). During December, the average low-temperature is a freezing cold 30.2°F (-1°C).Humidity
The average relative humidity in December is 76%.Rainfall
In Washington Park, in December, during 8.2 rainfall days, 2.28" (58mm) of precipitation is typically accumulated. In Washington Park, during the entire year, the rain falls for 154.5 days and collects up to 35.51" (902mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In Washington Park, in December, during 4.2 snowfall days, 2.05" (52mm) of snow is typically accumulated. In Washington Park, during the entire year, snow falls for 21.9 days and aggregates up to 7.91" (201mm) of snow.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 6:59 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:49 pm CST.
Sunshine
In December, the average sunshine is 4.9h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The average daily UV index of 2 in December transforms into the following instructions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December in Washington Park?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Washington Park have in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Washington Park, IL
- Average high temperature in December: 42.8°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in December: 30.2°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (24.4°F).
Average pressure in December
Washington Park, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Washington Park, IL
- Average wind speed in December: 8.6mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).
Average humidity in December
Washington Park, IL
- Average humidity in December: 76%
The months with the highest relative humidity are May and July (78%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Washington Park, IL
- Average rainfall in December: 2.28"
The wettest month (with the highest rainfall) is May (4.25").
The driest month (with the least rainfall) is February (1.89").
Average rainfall days in December
Washington Park, IL
- Average rainfall days in December: 8.2 days
The months with the highest number of rainy days are May and July (17.5 days).
The month with the least rainy days is January (8 days).
Average snowfall in December
Washington Park, IL
- Average snowfall in December: 2.05"
The month with the highest snowfall is February (2.64").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Washington Park, IL
- Average snowfall days in December: 4.2 days
The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Washington Park, IL
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 4h and 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
Washington Park, IL
- Average sunshine days in December: 18.8 days
The month with the most sunshine days is December (18.8 days).
The month with the least sunshine days is May (11.2 days).
Average UV index in December
Washington Park, IL
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
Washington Park, IL
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Washington Park, 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).
Washington Park, Illinois, USA
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