December weather forecast
Fairfax, IN

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Weather in December

The first month of the winter, December, is also an icy month in Fairfax, Indiana, with temperature in the range of an average low of 27°F (-2.8°C) and an average high of 36.5°F (2.5°C).

Temperature

The onset of December comes with a shift in the average high-temperature, falling from a chilly 47.5°F (8.6°C) in November to a cold 36.5°F (2.5°C). Throughout the month of December, Fairfax witnesses an average temperature of 27°F (-2.8°C).

Humidity

The average relative humidity in December is 83%.

Rainfall

In Fairfax, Indiana, in December, it is raining for 9.5 days, with typically 1.46" (37mm) of accumulated precipitation. In Fairfax, during the entire year, the rain falls for 151.9 days and collects up to 23.39" (594mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Fairfax, during December, snow falls for 10.7 days and regularly aggregates up to 1.85" (47mm) of snow. In Fairfax, during the entire year, snow falls for 50 days and aggregates up to 12.68" (322mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:46 am and sunset at 5:12 pm. On the last day of the month, 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 is December, 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 ordinary individuals.
Note: A maximum high daily UV index of 1 during December translates into the following directions:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Direct Sun exposure should be minimized especially during midday when radiation is most intense. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

In December, in Fairfax, the average high-temperature is 36.5°F (2.5°C), and the average low-temperature is 27°F (-2.8°C). In July, the average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, is calculated to be 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 83%.

How many days does it rain in December?

In Fairfax, in December, it is raining for 9.5 days, with typically 1.46" (37mm) of accumulated precipitation.

How many days does it snow in December?

In December, it is snowing for 10.7 days. Throughout December, 1.85" (47mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 17min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:46 am and sunset at 5:12 pm. On the last day of the month, sunrise is at 8:05 am and sunset at 5:22 pm EST.

How many hours of sunshine does Fairfax have in December?

In December, the average sunshine duration is 3.7h.

What is the month with the lowest UV index?

December is the month with the lowest UV index, with an average maximum UV index of 1.

How high is the UV index in December?

In December, the average daily maximum UV index is 1. A UV Index value of 2, and less, symbolizes a low health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Fairfax, IN

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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