December weather forecast
Montgomery, IL

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Weather in December

December, the first month of the winter in Montgomery, is also an icy month, with temperature in the range of an average low of 24.1°F (-4.4°C) and an average high of 34.5°F (1.4°C).

Temperature

The decrease of average high-temperatures is mild in December, with a decline from a chilly 46°F (7.8°C) in November to a cold 34.5°F (1.4°C). In December, the recorded average low-temperature is a freezing cold 24.1°F (-4.4°C).

Humidity

In December, the average relative humidity is 82%.

Rainfall

The months with the least rainfall are November and December Rain falls for 6.5 days and accumulates 0.75" (19mm) of rain.

Snowfall

January through April, October through December are months with snowfall. In Montgomery, in December, snow falls for 8.8 days, with typically accumulated 1.02" (26mm) of snow. In Montgomery, during the entire year, snow falls for 39.5 days and aggregates up to 6.69" (170mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:23 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:33 pm CST.

Sunshine

In December, the average sunshine is 4.2h.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.
Note: A daily high UV index of 1 in December leads to these guidelines:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.

Frequently asked questions

How cold is it in December?

The average high-temperature, in December, in Montgomery, is 34.5°F (1.4°C), while the average low-temperature is 24.1°F (-4.4°C). In July, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, is calculated to be 87.8°F (31°C).

What is the average humidity in December?

In Montgomery, the average relative humidity in December is 82%.

What is the driest month?

November and December are months with the least rain in Montgomery when the rain falls for 6.5 days and typically aggregates up to 0.75" (19mm) of rain.

How much does it rain in December?

In December, in Montgomery, the rain falls for 6.5 days. Throughout December, 0.75" (19mm) of precipitation is accumulated.

How many days does it snow in December?

In Montgomery, in December, snow falls for 8.8 days, with typically accumulated 1.02" (26mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 12min of daylight.

How many hours of daylight does Montgomery have in December?

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

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:33 pm CST.

How many hours of sunshine does Montgomery have in December?

In Montgomery, the average sunshine duration in December is 4.2h.

When is the lowest UV index?

The months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to Sun's UV rays.
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
Montgomery, IL

Average temperature in December - Montgomery, IL
  • Average high temperature in December: 34.5°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 (28.4°F).

  • Average low temperature in December: 24.1°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).

Average pressure in December
Montgomery, IL

Average pressure in December - Montgomery, 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
Montgomery, IL

Average wind speed in December - Montgomery, IL
  • Average wind speed in December: 9mph

The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).

Average humidity in December
Montgomery, IL

Average humidity in December - Montgomery, IL
  • Average humidity in December: 82%

The months with the highest relative humidity are January, February, July and August (83%).
The month with the lowest relative humidity is October (74%).

Average rainfall in December
Montgomery, IL

Average rainfall in December - Montgomery, IL
  • Average rainfall in December: 0.75"

The wettest month (with the highest rainfall) is June (2.24").
The driest months (with the least rainfall) are November and December (0.75").

Average rainfall days in December
Montgomery, IL

Average rainfall days in December - Montgomery, IL
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is February (4.3 days).

Average snowfall in December
Montgomery, IL

Average snowfall in December - Montgomery, IL
  • Average snowfall in December: 1.02"

The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Montgomery, IL

Average snowfall days in December - Montgomery, IL
  • Average snowfall days in December: 8.8 days

The month with the highest number of snowfall days is January (10.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Montgomery, IL
  • 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 1min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in December
Montgomery, IL

Average sunshine days in December - Montgomery, IL
  • Average sunshine days in December: 17.7 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (10.2 days).

Average UV index in December
Montgomery, IL

Average UV index in December - Montgomery, IL
  • 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
Montgomery, IL

Average cloud cover in December - Montgomery, IL
  • Average cloud cover in December: 57

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 32).

Average visibility in December
Montgomery, IL

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

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

Montgomery, Illinois, USA

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