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 start of December signals a decrease in the average high-temperature, transitioning from a chilly 47.1°F (8.4°C) in November to a wintry 35.1°F (1.7°C). An average low-temperature of 25°F (-3.9°C) is noted in Crystal Lawns during the month of December.Humidity
In Crystal Lawns, the average relative humidity in December is 82%.Rainfall
In December, the rain falls for 8.1 days. Throughout December, 1.69" (43mm) of precipitation is accumulated. In Crystal Lawns, Illinois, during the entire year, the rain falls for 153.6 days and collects up to 32.72" (831mm) of precipitation.Snowfall
January through April, November and December are months with snowfall in Crystal Lawns, Illinois. In December, it is snowing for 8 days. Throughout December, 2.4" (61mm) of snow is accumulated. In Crystal Lawns, during the entire year, snow falls for 38.2 days and aggregates up to 14.61" (371mm) of snow.Daylight
December has the shortest days of the year in Crystal Lawns, Illinois, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:23 pm. On the last day of December, in Crystal Lawns, sunrise is at 7:19 am and sunset at 4:32 pm CST.
Sunshine
The average sunshine in December in Crystal Lawns is 4.1h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 1 in December interprets into the following recommendations:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Frequently asked questions
How cold is December in Crystal Lawns?
What is the average humidity in December in Crystal Lawns?
How much does it rain in Crystal Lawns in December?
How much does it snow in Crystal Lawns in December?
What is the month with the shortest days in Crystal Lawns?
What is the average length of the day in December in Crystal Lawns?
What time are sunrise and sunset in December in Crystal Lawns?
How long on average sun shines in December in Crystal Lawns?
What is the month with the lowest UV index in Crystal Lawns?
How high is the UV index in December in Crystal Lawns?
Average temperature in December
Crystal Lawns, IL
- Average high temperature in December: 35.1°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in December: 25°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in December
Crystal Lawns, IL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Crystal Lawns, IL
- Average wind speed in December: 8.9mph
The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in December
Crystal Lawns, IL
- Average humidity in December: 82%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Crystal Lawns, IL
- Average rainfall in December: 1.69"
The wettest month (with the highest rainfall) is May (4.41").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days in December
Crystal Lawns, IL
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in December
Crystal Lawns, IL
- Average snowfall in December: 2.4"
The month with the highest snowfall is January (4.33").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Crystal Lawns, IL
- Average snowfall days in December: 8 days
The month with the highest number of snowfall days is January (11.9 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
Crystal Lawns, IL
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Crystal Lawns, IL
- Average sunshine days in December: 15.9 days
The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in December
Crystal Lawns, IL
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Crystal Lawns, IL
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility in December
Crystal Lawns, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Crystal Lawns, Illinois, USA
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