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
December comes with a drop in the average high-temperature, falling from November's chilly 46.8°F (8.2°C) to a cold 35.8°F (2.1°C). In South Holland, the average low-temperature during December nights tends to settle at a freezing cold 26.8°F (-2.9°C), indicating a slight drop from the daytime peak.Humidity
In South Holland, the average relative humidity in December is 80%.Rainfall
The months with the least rainfall are February and December Rain falls for 4.2 days and accumulates 0.47" (12mm) of rain.Snowfall
Months with snowfall in South Holland are January through April, October through December. In December, it is snowing for 7.5 days. Throughout December, 0.51" (13mm) of snow is accumulated. Throughout the year, in South Holland, there are 34.1 snowfall days, and 4.13" (105mm) of snow is accumulated.Daylight
The month with the shortest days in South Holland is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 6:58 am and sunset at 4:21 pm. On the last day of December, in South Holland, sunrise is at 7:17 am and sunset at 4:30 pm CST.
Sunshine
The average sunshine in December is 4h.UV index
December is the month with the lowest UV index in South Holland, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 1 in December translates into the following instructions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Frequently asked questions
How cold is December in South Holland?
What is the average humidity in December in South Holland?
What is the driest month in South Holland?
How much does it rain in South Holland in December?
How much does it snow in South Holland in December?
What is the month with the shortest days in South Holland?
How many hours of daylight does South Holland have in December?
When are sunrise and sunset in December in South Holland?
How long on average sun shines in December in South Holland?
When is the lowest UV index in South Holland?
How high is the UV index in December in South Holland?
Average temperature in December
South Holland, IL
- Average high temperature in December: 35.8°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in December: 26.8°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in December
South Holland, 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
South Holland, IL
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is January (11mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in December
South Holland, IL
- Average humidity in December: 80%
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
South Holland, IL
- Average rainfall in December: 0.47"
The wettest months (with the highest rainfall) are May and June (1.38").
The driest months (with the least rainfall) are February and December (0.47").
Average rainfall days in December
South Holland, IL
- Average rainfall days in December: 4.2 days
The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in December
South Holland, IL
- Average snowfall in December: 0.51"
The month with the highest snowfall is January (1.1").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
South Holland, IL
- Average snowfall days in December: 7.5 days
The month with the highest number of snowfall days is January (9.3 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
South Holland, 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 0min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
South Holland, IL
- Average sunshine days in December: 19.8 days
The month with the most sunshine days is December (19.8 days).
The month with the least sunshine days is June (13.1 days).
Average UV index in December
South Holland, 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
South Holland, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
South Holland, 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).
South Holland, Illinois, USA
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