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 arrival of December indicates a decrease in the average high-temperature, moving from a frosty 45.5°F (7.5°C) in November to an icy 33.1°F (0.6°C). In the month of December, Fairfax's average low-temperature falls to a subzero cold 22.5°F (-5.3°C).Humidity
The average relative humidity in December is 81%.Rainfall
In December, the rain falls for 5.9 days. Throughout December, 0.79" (20mm) of precipitation is accumulated. Throughout the year, there are 120.7 rainfall days, and 18.31" (465mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Fairfax, in December, snow falls for 8.2 days, with typically accumulated 1.46" (37mm) of snow. Throughout the year, in Fairfax, there are 36.1 snowfall days, and 8.43" (214mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of December in Fairfax, sunrise is at 7:16 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:46 pm CST.
Sunshine
In Fairfax, the average sunshine in December is 4.4h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
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?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Fairfax have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Fairfax have in December?
What are the months with the lowest UV index in Fairfax?
What is the UV index reading in December?
Average temperature in December
Fairfax, IA
- Average high temperature in December: 33.1°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in December: 22.5°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (14.2°F).
Average pressure in December
Fairfax, 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 (29.9"Hg).
Average wind speed in December
Fairfax, IA
- Average wind speed in December: 10.1mph
The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in December
Fairfax, IA
- Average humidity in December: 81%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Fairfax, IA
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is May (3.07").
The driest months (with the least rainfall) are January and February (0.63").
Average rainfall days in December
Fairfax, IA
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is May (16 days).
The month with the least rainy days is February (3 days).
Average snowfall in December
Fairfax, IA
- Average snowfall in December: 1.46"
The month with the highest snowfall is January (2.64").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Fairfax, IA
- Average snowfall days in December: 8.2 days
The month with the highest number of snowfall days is January (10.3 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
Fairfax, 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 12min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Fairfax, IA
- Average sunshine days in December: 18.6 days
The month with the most sunshine days is October (19.9 days).
The month with the least sunshine days is June (11.8 days).
Average UV index in December
Fairfax, IA
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Fairfax, IA
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in December
Fairfax, IA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Fairfax, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location