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
The shift from November to December involves a decrease in the average high-temperature, dropping from a chilly 47.3°F (8.5°C) to an icy 35.6°F (2°C). Porterfield throughout December, records an average low-temperature of 25.3°F (-3.7°C).Humidity
In Porterfield, the average relative humidity in December is 81%.Rainfall
January and December are months with the least rain when the rain falls for 7.5 days and typically aggregates up to 1.57" (40mm) of rain.Snowfall
January through April, October through December are months with snowfall. In December, it is snowing for 7 days. Throughout December, 2.28" (58mm) of snow is accumulated. In Porterfield, during the entire year, snow falls for 36.7 days and aggregates up to 14.09" (358mm) 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 in Porterfield, sunrise is at 7:03 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:38 pm CST.
Sunshine
The average sunshine in December is 4.2h.UV index
The average daily maximum UV index in December in Porterfield, Illinois, is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.Note: A daily high UV index of 2 in December leads to these guidelines:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Frequently asked questions
How cold is December in Porterfield?
What is the average humidity in December in Porterfield?
What is the driest month in Porterfield?
How many days does it rain in December in Porterfield?
How much does it snow in Porterfield in December?
What is the month with the shortest days in Porterfield?
What is the average length of the day in December in Porterfield?
When is the sunrise / sunset in December in Porterfield?
How many hours of sunshine does Porterfield have in December?
How high is the UV index in December in Porterfield?
Average temperature in December
Porterfield, IL
- Average high temperature in December: 35.6°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in December: 25.3°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in December
Porterfield, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Porterfield, IL
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Porterfield, IL
- Average humidity in December: 81%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Porterfield, IL
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is May (4.41").
The driest months (with the least rainfall) are January and December (1.57").
Average rainfall days in December
Porterfield, IL
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in December
Porterfield, IL
- Average snowfall in December: 2.28"
The month with the highest snowfall is February (3.7").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Porterfield, IL
- Average snowfall days in December: 7 days
The month with the highest number of snowfall days is January (11.2 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
Porterfield, IL
- 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: 4h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Porterfield, IL
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
Porterfield, IL
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Porterfield, IL
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in December
Porterfield, IL
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Porterfield, Illinois, USA
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