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
Setting in of December comes with a decrease in the average high-temperature, moving from a chilly 47.5°F (8.6°C) in November to a cold 36.5°F (2.5°C). Fairfax experiences a consistent average temperature of 27°F (-2.8°C) throughout the nights in December.Humidity
The average relative humidity in December is 83%.Rainfall
In Fairfax, in December, during 9.5 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. In Fairfax, during the entire year, the rain falls for 151.9 days and collects up to 23.39" (594mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In December, it is snowing for 10.7 days. Throughout December, 1.85" (47mm) of snow is accumulated. Throughout the year, there are 50 snowfall days, and 12.68" (322mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:46 am and sunset at 5:12 pm. On the last day of December, sunrise is at 8:05 am and sunset at 5:22 pm EST.
Sunshine
The average sunshine in December is 3.7h.UV index
The month with the lowest UV index in Fairfax is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 1 in December translates into this advice:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. To guard against the harmful effects of the Sun, minimize exposure during midday. Always opt for UVA and UVB-resistant sunglasses on radiant days. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Fairfax have in December?
When are sunrise and sunset in December?
How many hours of sunshine does Fairfax have in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Fairfax, IN
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in December: 27°F
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).
Average pressure in December
Fairfax, IN
- Average pressure in December: 30.1"Hg
The months with the highest atmospheric pressure are January and November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Fairfax, IN
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in December
Fairfax, IN
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
Fairfax, IN
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is February (1.38").
Average rainfall days in December
Fairfax, IN
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in December
Fairfax, IN
- Average snowfall in December: 1.85"
The month with the highest snowfall is February (3.58").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Fairfax, IN
- Average snowfall days in December: 10.7 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Fairfax, IN
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 3h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in December
Fairfax, IN
- Average sunshine days in December: 13.4 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is February (10.4 days).
Average UV index in December
Fairfax, IN
- 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
Fairfax, IN
- Average cloud cover in December: 62
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in December
Fairfax, IN
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).
Fairfax, Indiana, USA
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