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
The onset of December is marked by a decrease in temperature, transitioning from a chilly 48.4°F (9.1°C) in November to an icy 35.6°F (2°C). The temperature dips to an average of 23.5°F (-4.7°C) during December nights.Humidity
The average relative humidity in December is 79%.Rainfall
The months with the least rainfall are January and December Rain falls for 5.5 days and accumulates 0.71" (18mm) of rain.Snowfall
January through May, October through December are months with snowfall. In Allerton, during December, snow falls for 5.7 days and regularly aggregates up to 0.98" (25mm) of snow. Throughout the year, there are 28.4 snowfall days, and 11.34" (288mm) of snow is accumulated.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 7:18 am and sunset at 4:46 pm. On the last day of December, sunrise is at 7:37 am and sunset at 4:56 pm CST.
Sunshine
In Allerton, the average sunshine in December is 4.8h.UV index
In Allerton, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: A typical high UV index of 2 in December suggests the following recommendations:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
What is the driest month?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How many hours of sunshine does Allerton have in December?
What is the UV index reading in December?
Average temperature in December
Allerton, IA
- Average high temperature in December: 35.6°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (30°F).
- Average low temperature in December: 23.5°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in December
Allerton, IA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Allerton, IA
- Average wind speed in December: 10mph
The windiest months (with the highest average wind speed) are January and March (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in December
Allerton, IA
- Average humidity in December: 79%
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Allerton, IA
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is June (3.31").
The driest months (with the least rainfall) are January and December (0.71").
Average rainfall days in December
Allerton, IA
- Average rainfall days in December: 5.5 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in December
Allerton, IA
- Average snowfall in December: 0.98"
The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Allerton, IA
- Average snowfall days in December: 5.7 days
The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Allerton, IA
- 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 5min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Allerton, IA
- Average sunshine days in December: 20.9 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.7 days).
Average UV index in December
Allerton, IA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Allerton, IA
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July, August and September (Cloud cover 29).
Average visibility in December
Allerton, IA
- 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).
Allerton, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location