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
With the onset of December, Mettawa experiences a modest temperature adjustment, with the average high-temperature receding from a chilly 45.3°F (7.4°C) in November to a cold 33.6°F (0.9°C). Mettawa records a mean low-temperature of 24.3°F (-4.3°C) in December.Humidity
In Mettawa, the average relative humidity in December is 81%.Rainfall
The months with the least rainfall are November and December Rain falls for 7.8 days and accumulates 1.3" (33mm) of rain.Snowfall
Months with snowfall in Mettawa are January through May, October through December. In Mettawa, during December, snow falls for 10.4 days and regularly aggregates up to 3.03" (77mm) of snow. Throughout the year, there are 48.2 snowfall days, and 18.86" (479mm) of snow is accumulated.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:01 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:29 pm CST.
Sunshine
The average sunshine in December in Mettawa is 4h.UV index
December is the month with the lowest UV index in Mettawa, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for average individuals.Note: The UV index of 1 during December translates into the following guidance:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Mettawa in December?
What is the average humidity in December in Mettawa?
What is the driest month in Mettawa?
How many days does it rain in December in Mettawa?
How many days does it snow in December in Mettawa?
What is the month with the shortest days in Mettawa?
How many hours of daylight does Mettawa have in December?
When are sunrise and sunset in December in Mettawa?
How long on average sun shines in December in Mettawa?
When is the lowest UV index in Mettawa?
How high is the UV index in December in Mettawa?
Average temperature in December
Mettawa, IL
- Average high temperature in December: 33.6°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 24.3°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in December
Mettawa, 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
Mettawa, IL
- Average wind speed in December: 9.5mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Mettawa, IL
- Average humidity in December: 81%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Mettawa, IL
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is June (3.54").
The driest months (with the least rainfall) are November and December (1.3").
Average rainfall days in December
Mettawa, IL
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in December
Mettawa, IL
- Average snowfall in December: 3.03"
The month with the highest snowfall is February (5.55").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mettawa, IL
- Average snowfall days in December: 10.4 days
The month with the highest number of snowfall days is January (12.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mettawa, 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 12min).
- Average sunshine in December: 4h and 0min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Mettawa, IL
- Average sunshine days in December: 14.5 days
The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is June (10 days).
Average UV index in December
Mettawa, IL
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Mettawa, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in December
Mettawa, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Mettawa, Illinois, USA
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