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
During Norris's transition into December, the average high-temperature lessens, moving from a frosty 48.9°F (9.4°C) in November to a cold 36.9°F (2.7°C). During the nights in December, Norris experiences a consistent average temperature of 26.2°F (-3.2°C).Humidity
In Norris, the average relative humidity in December is 79%.Rainfall
February and December are months with the least rain when the rain falls for 4 days and typically aggregates up to 0.35" (9mm) of rain.Snowfall
Months with snowfall in Norris are January through April, October through December. In December, it is snowing for 3.8 days. Throughout December, 0.31" (8mm) of snow is accumulated. In Norris, Illinois, during the entire year, snow falls for 19.9 days and aggregates up to 3.07" (78mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:05 am and sunset at 4:33 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:43 pm CST.
Sunshine
The average sunshine in December in Norris is 4.5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
What is the driest month?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Norris, IL
- Average high temperature in December: 36.9°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (31.3°F).
- Average low temperature in December: 26.2°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).
Average pressure in December
Norris, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Norris, IL
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Norris, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Norris, IL
- Average rainfall in December: 0.35"
The wettest month (with the highest rainfall) is May (1.3").
The driest months (with the least rainfall) are February and December (0.35").
Average rainfall days in December
Norris, IL
- Average rainfall days in December: 4 days
The month with the highest number of rainy days is June (13.2 days).
The month with the least rainy days is January (3 days).
Average snowfall in December
Norris, IL
- Average snowfall in December: 0.31"
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
Norris, IL
- Average snowfall days in December: 3.8 days
The month with the highest number of snowfall days is January (6.4 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
Norris, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 3min
The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Norris, IL
- Average sunshine days in December: 23.4 days
The month with the most sunshine days is January (23.6 days).
The month with the least sunshine days is June (14.4 days).
Average UV index in December
Norris, IL
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Norris, IL
- Average cloud cover in December: 52
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in December
Norris, 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).
Norris, Illinois, USA
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