December weather forecast
Phoenix, IL

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Weather in December

The first month of the winter, December, is also a wintry month in Phoenix, Illinois, with an average temperature varying between 35.6°F (2°C) and 25.9°F (-3.4°C).

Temperature

The move into December indicates a reduction in the average high-temperature, down from November's chilly 46.9°F (8.3°C) to a cold 35.6°F (2°C). In the month of December, Phoenix's average low-temperature falls to a freezing cold 25.9°F (-3.4°C).

Humidity

In Phoenix, the average relative humidity in December is 81%.

Rainfall

The month with the least rainfall is December, when the rain falls for 7.9 days and typically collects 1.54" (39mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. In December, it is snowing for 9.1 days. Throughout December, 2.76" (70mm) of snow is accumulated. Throughout the year, there are 44.6 snowfall days, and 16.46" (418mm) 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, sunrise is at 6:58 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:30 pm CST.

Sunshine

In December, the average sunshine is 4h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average person.
Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Updated: Aug 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature in Phoenix during December is 35.6°F (2°C) and the low-temperature is 25.9°F (-3.4°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in July is calculated to be 87.8°F (31°C).

What is the average humidity in December?

In Phoenix, the average relative humidity in December is 81%.

What is the driest month?

The month with the least rainfall is December, when the rain falls for 7.9 days and typically collects 1.54" (39mm) of precipitation.

How many days does it rain in December?

In Phoenix, in December, during 7.9 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Phoenix, in December, during 9.1 snowfall days, 2.76" (70mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 12min of daylight.

What is the average length of the day in December?

In Phoenix, the average day length in December is 9h and 13min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:58 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:30 pm CST.

How long on average sun shines in December?

In Phoenix, the average sunshine duration in December is 4h.

What is the month with the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to 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
Phoenix, IL

Average temperature in December - Phoenix, IL
  • Average high temperature in December: 35.6°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in December: 25.9°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

Average pressure in December
Phoenix, IL

Average pressure in December - Phoenix, IL
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Phoenix, IL

Average wind speed in December - Phoenix, IL
  • Average wind speed in December: 9.5mph

The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

Average humidity in December
Phoenix, IL

Average humidity in December - Phoenix, IL
  • Average humidity in December: 81%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).

Average rainfall in December
Phoenix, IL

Average rainfall in December - Phoenix, IL
  • Average rainfall in December: 1.54"

The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is December (1.54").

Average rainfall days in December
Phoenix, IL

Average rainfall days in December - Phoenix, IL
  • Average rainfall days in December: 7.9 days

The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is February (6.1 days).

Average snowfall in December
Phoenix, IL

Average snowfall in December - Phoenix, IL
  • Average snowfall in December: 2.76"

The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Phoenix, IL

Average snowfall days in December - Phoenix, IL
  • Average snowfall days in December: 9.1 days

The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Phoenix, IL

Average daylight in December / Average sunshine in December - Phoenix, IL
  • Average daylight in December: 9h and 1min

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 12min).

  • Average sunshine in December: 4h and 0min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days in December
Phoenix, IL

Average sunshine days in December - Phoenix, IL
  • Average sunshine days in December: 15 days

The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is April (10.2 days).

Average UV index in December
Phoenix, IL

Average UV index in December - Phoenix, IL
  • Average UV index in December: 1

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Phoenix, IL

Average cloud cover in December - Phoenix, IL
  • Average cloud cover in December: 59

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in December
Phoenix, IL

Average visibility in December - Phoenix, IL
  • Average visibility in December: 6mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

Phoenix, Illinois, USA

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