December weather forecastWaterloo, IL
December
Weather in December
The first month of the winter, December, is also a frosty month in Waterloo, Illinois, with an average temperature varying between 43.2°F (6.2°C) and 30.9°F (-0.6°C).Temperature
In Waterloo, the beginning of December is marked by a lowered average high-temperature, shifting from November's cool 53.6°F (12°C) to a chilly 43.2°F (6.2°C). Throughout December nights, Waterloo experiences a consistent temperature average of 30.9°F (-0.6°C).Humidity
In December, the average relative humidity is 76%.Rainfall
In Waterloo, during December, the rain falls for 8.1 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, there are 139.8 rainfall days, and 25.63" (651mm) of precipitation is accumulated.Snowfall
January through March, September, November and December are months with snowfall in Waterloo, Illinois. In Waterloo, in December, snow falls for 3.5 days, with typically accumulated 1.54" (39mm) of snow. Throughout the year, there are 18.7 snowfall days, and 6.65" (169mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 6:59 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:50 pm CST.
Sunshine
In Waterloo, the average sunshine in December is 5h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: The UV index of 2 during December translates into the following guidance:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Waterloo, IL
- Average high temperature in December: 43.2°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (38.3°F).
- Average low temperature in December: 30.9°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in December
Waterloo, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Waterloo, IL
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in December
Waterloo, IL
- Average humidity in December: 76%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Waterloo, IL
- Average rainfall in December: 1.77"
The wettest month (with the highest rainfall) is May (3.19").
The driest months (with the least rainfall) are February and November (1.34").
Average rainfall days in December
Waterloo, IL
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is July (16.2 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in December
Waterloo, IL
- Average snowfall in December: 1.54"
The month with the highest snowfall is January (1.89").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in December
Waterloo, IL
- Average snowfall days in December: 3.5 days
The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Waterloo, IL
- Average daylight in December: 9h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 5h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in December
Waterloo, IL
- Average sunshine days in December: 20.4 days
The month with the most sunshine days is January (20.6 days).
The month with the least sunshine days is July (12.5 days).
Average UV index in December
Waterloo, IL
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
Waterloo, IL
- Average cloud cover in December: 47
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are June and August (Cloud cover 27).
Average visibility in December
Waterloo, 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).
