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 arrival of December corresponds with a shift in temperature, down from a frosty 47.5°F (8.6°C) in November to an icy 35.8°F (2.1°C). Speer's temperature tends to fall to an average low of 25°F (-3.9°C) during the nights of December.Humidity
In Speer, Illinois, the average relative humidity in December is 81%.Rainfall
In December, the rain falls for 5.4 days. Throughout December, 0.63" (16mm) of precipitation is accumulated. Throughout the year, there are 116.8 rainfall days, and 13.98" (355mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Speer, Illinois. In Speer, in December, during 5.8 snowfall days, 0.83" (21mm) of snow is typically accumulated. In Speer, during the entire year, snow falls for 26.8 days and aggregates up to 6.26" (159mm) of snow.Daylight
December has the shortest days of the year in Speer, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:04 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:40 pm CST.
Sunshine
In Speer, Illinois, the average sunshine in December is 4.3h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The daily maximum UV index of 1 in December interprets into the following advice:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold is it in Speer in December?
What is the average humidity in December in Speer?
How many days does it rain in December in Speer?
How much does it snow in Speer in December?
What is the month with the shortest days in Speer?
How many hours of daylight does Speer have in December?
When is the sunrise / sunset in December in Speer?
How many hours of sunshine does Speer have in December?
When is the lowest UV index in Speer?
What is the UV index intensity in December in Speer?
Average temperature in December
Speer, IL
- Average high temperature in December: 35.8°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 (29.7°F).
- Average low temperature in December: 25°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in December
Speer, IL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Speer, IL
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in December
Speer, IL
- Average humidity in December: 81%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Speer, IL
- Average rainfall in December: 0.63"
The wettest month (with the highest rainfall) is May (2.24").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in December
Speer, IL
- Average rainfall days in December: 5.4 days
The month with the highest number of rainy days is May (15.2 days).
The months with the least rainy days are January and February (4.2 days).
Average snowfall in December
Speer, IL
- Average snowfall in December: 0.83"
The month with the highest snowfall is January (1.81").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Speer, IL
- Average snowfall days in December: 5.8 days
The month with the highest number of snowfall days is January (8.6 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
Speer, 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 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in December
Speer, IL
- Average sunshine days in December: 20.4 days
The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is May (12.8 days).
Average UV index in December
Speer, 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
Speer, IL
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in December
Speer, 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).
Speer, Illinois, USA
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