December weather forecast
Perry, IL

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Weather in December

December, the first month of the winter in Perry, is also an icy month, with temperature in the range of an average low of 27.9°F (-2.3°C) and an average high of 39°F (3.9°C).

Temperature

As November shifts into December, a slight alteration in temperatures is observed, with average highs reducing from a cool 50.9°F (10.5°C) to an icy 39°F (3.9°C). The temperature lowers to an average of 27.9°F (-2.3°C) during December nights.

Humidity

The average relative humidity in December is 77%.

Rainfall

In Perry, in December, it is raining for 7 days, with typically 0.87" (22mm) of accumulated precipitation. In Perry, Illinois, during the entire year, the rain falls for 128.8 days and collects up to 18.35" (466mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Perry, in December, snow falls for 4.2 days, with typically accumulated 0.79" (20mm) of snow. In Perry, during the entire year, snow falls for 21.9 days and aggregates up to 5.67" (144mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:48 pm CST.

Sunshine

In Perry, the average sunshine in December is 4.8h.

UV index

The months with the lowest UV index in Perry are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index of 2 during December leads to these instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

An average high-temperature, in December, in Perry, is 39°F (3.9°C) and the average low-temperature is 27.9°F (-2.3°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, is estimated at 91.4°F (33°C).

What is the average humidity in December?

The average relative humidity in December is 77%.

How much does it rain in December?

In Perry, in December, during 7 rainfall days, 0.87" (22mm) of precipitation is typically accumulated.

How many days does it snow in December?

In December, it is snowing for 4.2 days. Throughout December, 0.79" (20mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year in Perry, with an average of 9h and 24min of daylight.

How many hours of daylight does Perry have in December?

In Perry, the average day length in December is 9h and 25min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:48 pm CST.

How many hours of sunshine does Perry have in December?

In December, the average sunshine duration is 4.8h.

When is the lowest UV index?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in December in Perry?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability 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
Perry, IL

Average temperature in December - Perry, IL
  • Average high temperature in December: 39°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in December: 27.9°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
Perry, IL

Average pressure in December - Perry, IL
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Perry, IL

Average wind speed in December - Perry, IL
  • Average wind speed in December: 9.4mph

The windiest months (with the highest average wind speed) are January, February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (6mph).

Average humidity in December
Perry, IL

Average humidity in December - Perry, IL
  • Average humidity in December: 77%

The months with the highest relative humidity are June and July (81%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Perry, IL

Average rainfall in December - Perry, IL
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is February (0.75").

Average rainfall days in December
Perry, IL

Average rainfall days in December - Perry, IL
  • Average rainfall days in December: 7 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).

Average snowfall in December
Perry, IL

Average snowfall in December - Perry, IL
  • Average snowfall in December: 0.79"

The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Perry, IL

Average snowfall days in December - Perry, IL
  • Average snowfall days in December: 4.2 days

The month with the highest number of snowfall days is January (6.3 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
Perry, IL

Average daylight in December / Average sunshine in December - Perry, IL
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 4h and 5min

The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in December
Perry, IL

Average sunshine days in December - Perry, IL
  • Average sunshine days in December: 20.7 days

The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is June (12.3 days).

Average UV index in December
Perry, IL

Average UV index in December - Perry, IL
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Perry, IL

Average cloud cover in December - Perry, IL
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).

Average visibility in December
Perry, IL

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

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

Perry, Illinois, USA

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