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's arrival in Waterloo coincides with a drop in the average high-temperature, decreasing from November's chilly 44.1°F (6.7°C) to a freezing cold 31.1°F (-0.5°C). During December, the average low-temperature is 20.5°F (-6.4°C).Humidity
The average relative humidity in December is 82%.Rainfall
In Waterloo, in December, during 5.8 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. In Waterloo, during the entire year, the rain falls for 133.6 days and collects up to 28.27" (718mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Waterloo, in December, during 8.9 snowfall days, 2.8" (71mm) of snow is typically accumulated. In Waterloo, during the entire year, snow falls for 41.6 days and aggregates up to 15.24" (387mm) of snow.Daylight
The month with the shortest days in Waterloo is December, with an average of 9h and 6min of daylight.On the first day of December in Waterloo, sunrise is at 7:20 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 4:46 pm CST.
Sunshine
In December, the average sunshine in Waterloo is 4.3h.UV index
December is the month with the lowest UV index in Waterloo, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: In December, an average UV index of 1 transforms into the following instructions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. When the Sun is at its strongest around midday, find shade and limit exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Waterloo?
What is the average humidity in December in Waterloo?
How many days does it rain in December in Waterloo?
How many days does it snow in December in Waterloo?
What is the month with the shortest days in Waterloo?
What is the average length of the day in December in Waterloo?
When is the sunrise / sunset in December in Waterloo?
How many hours of sunshine does Waterloo have in December?
When is the lowest UV index in Waterloo?
What is the UV index reading in December in Waterloo?
Average temperature in December
Waterloo, IA
- Average high temperature in December: 31.1°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in December: 20.5°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (12°F).
Average pressure in December
Waterloo, IA
- 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 (29.89"Hg).
Average wind speed in December
Waterloo, IA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in December
Waterloo, IA
- Average humidity in December: 82%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Waterloo, IA
- Average rainfall in December: 1.34"
The wettest month (with the highest rainfall) is June (4.29").
The driest months (with the least rainfall) are January and February (1.02").
Average rainfall days in December
Waterloo, IA
- Average rainfall days in December: 5.8 days
The month with the highest number of rainy days is June (18.1 days).
The month with the least rainy days is February (4 days).
Average snowfall in December
Waterloo, IA
- Average snowfall in December: 2.8"
The month with the highest snowfall is January (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Waterloo, IA
- Average snowfall days in December: 8.9 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Waterloo, IA
- 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 2min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Waterloo, IA
- Average sunshine days in December: 17.7 days
The month with the most sunshine days is October (17.8 days).
The month with the least sunshine days is June (10 days).
Average UV index in December
Waterloo, IA
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Waterloo, IA
- Average cloud cover in December: 56
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in December
Waterloo, IA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Waterloo, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location