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 decrease in the average high-temperature is observed during December, shifting from a frosty 45.1°F (7.3°C) in November to a wintry 34°F (1.1°C). Zion's December nights observe a minor shift from the daytime temperatures, resulting in an average dip to a subzero cold 25.3°F (-3.7°C).Humidity
In Zion, Illinois, the average relative humidity in December is 81%.Rainfall
December is the month with the least rainfall in Zion, Illinois. Rain falls for 8.1 days and accumulates 0.91" (23mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Zion, in December, during 9.7 snowfall days, 1.77" (45mm) of snow is typically accumulated. In Zion, during the entire year, snow falls for 45.5 days and aggregates up to 9.37" (238mm) of snow.Daylight
The month with the shortest days in Zion is December, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:01 am and sunset at 4:19 pm. On the last day of December, in Zion, sunrise is at 7:20 am and sunset at 4:28 pm CST.
Sunshine
The average sunshine in December in Zion is 4h.UV index
The months with the lowest UV index in Zion are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Frequently asked questions
How cold is it in Zion in December?
What is the average humidity in December in Zion?
What is the driest month in Zion?
How many days does it rain in December in Zion?
How much does it snow in Zion in December?
What is the month with the shortest days in Zion?
What is the average length of the day in December in Zion?
What time are sunrise and sunset in December in Zion?
How long on average sun shines in December in Zion?
When is the lowest UV index in Zion?
What is the UV index intensity in December in Zion?
Average temperature in December
Zion, IL
- Average high temperature in December: 34°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 25.3°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in December
Zion, IL
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Zion, IL
- Average wind speed in December: 11.1mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in December
Zion, IL
- Average humidity in December: 81%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in December
Zion, IL
- Average rainfall in December: 0.91"
The wettest months (with the highest rainfall) are June and August (2.68").
The driest month (with the least rainfall) is December (0.91").
Average rainfall days in December
Zion, IL
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in December
Zion, IL
- Average snowfall in December: 1.77"
The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Zion, IL
- Average snowfall days in December: 9.7 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
Zion, 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 months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Zion, IL
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in December
Zion, 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
Zion, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Zion, 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).
Zion, Illinois, USA
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