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 indicates a shift in the average high-temperature, from November's chilly 47.5°F (8.6°C) to a cold 36.5°F (2.5°C). During the month of December, an average temperature of 25.9°F (-3.4°C) is noted during the nights in Pontiac.Humidity
In Pontiac, the average relative humidity in December is 81%.Rainfall
In Pontiac, in December, during 6.2 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. In Pontiac, Illinois, during the entire year, the rain falls for 125.3 days and collects up to 15.71" (399mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Pontiac. In Pontiac, Illinois, during December, snow falls for 6.3 days and regularly aggregates up to 0.94" (24mm) of snow. In Pontiac, Illinois, during the entire year, snow falls for 30.6 days and aggregates up to 6.93" (176mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of December in Pontiac, sunrise is at 7:00 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:36 pm CST.
Sunshine
The average sunshine in December in Pontiac is 4.3h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: A daily high UV index of 1 in December leads to these guidelines:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. The Sun's radiation is especially intense around midday; try to stay in shade during this period. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Frequently asked questions
How cold is December in Pontiac?
What is the average humidity in December in Pontiac?
How much does it rain in Pontiac in December?
How much does it snow in Pontiac in December?
What is the month with the shortest days in Pontiac?
How many hours of daylight does Pontiac have in December?
What time are sunrise and sunset in December in Pontiac?
How many hours of sunshine does Pontiac have in December?
When is the lowest UV index in Pontiac?
What is the UV index reading in December in Pontiac?
Average temperature in December
Pontiac, IL
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (30.2°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure in December
Pontiac, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Pontiac, IL
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in December
Pontiac, IL
- Average humidity in December: 81%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Pontiac, IL
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is May (2.44").
The driest months (with the least rainfall) are January and February (0.71").
Average rainfall days in December
Pontiac, IL
- Average rainfall days in December: 6.2 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in December
Pontiac, IL
- Average snowfall in December: 0.94"
The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Pontiac, IL
- Average snowfall days in December: 6.3 days
The month with the highest number of snowfall days is January (10.2 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
Pontiac, IL
- Average daylight in December: 9h and 2min
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 18min).
- Average sunshine in December: 4h and 2min
The months with the most sunshine are June and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Pontiac, IL
- Average sunshine days in December: 19.3 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in December
Pontiac, IL
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Pontiac, IL
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in December
Pontiac, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Pontiac, Illinois, USA
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