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 onset of December coincides with a reduction in the average high-temperature, falling from a chilly 49.6°F (9.8°C) in November to a wintry 38.3°F (3.5°C). During the month of December, an average temperature of 27.3°F (-2.6°C) is noted during the nights in Hartsburg.Humidity
In December, the average relative humidity is 79%.Rainfall
December is the month with the least rainfall. Rain falls for 6.7 days and accumulates 1.02" (26mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Hartsburg, in December, during 5.6 snowfall days, 0.94" (24mm) of snow is typically accumulated. In Hartsburg, during the entire year, snow falls for 24.9 days and aggregates up to 7.64" (194mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:01 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:41 pm CST.
Sunshine
In Hartsburg, the average sunshine in December is 4.5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Hartsburg. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A typical high UV index of 2 in December suggests the following recommendations:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Avoiding the Sun during its peak radiation time around midday is a healthy practice. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold in Hartsburg during December?
What is the average humidity in December in Hartsburg?
What is the driest month in Hartsburg?
How many days does it rain in December in Hartsburg?
How many days does it snow in December in Hartsburg?
What is the month with the shortest days in Hartsburg?
What is the average length of the day in December in Hartsburg?
When are sunrise and sunset in December in Hartsburg?
How many hours of sunshine does Hartsburg have in December?
What are the months with the lowest UV index in Hartsburg?
What is the UV index reading in December in Hartsburg?
Average temperature in December
Hartsburg, IL
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.2°F).
- Average low temperature in December: 27.3°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure in December
Hartsburg, IL
- Average pressure in December: 30.12"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
Hartsburg, IL
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in December
Hartsburg, IL
- Average humidity in December: 79%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in December
Hartsburg, IL
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is December (1.02").
Average rainfall days in December
Hartsburg, IL
- Average rainfall days in December: 6.7 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is February (5.4 days).
Average snowfall in December
Hartsburg, IL
- Average snowfall in December: 0.94"
The month with the highest snowfall is January (2.76").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Hartsburg, IL
- Average snowfall days in December: 5.6 days
The month with the highest number of snowfall days is January (8.2 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
Hartsburg, IL
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 3min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Hartsburg, IL
- Average sunshine days in December: 19.2 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Hartsburg, 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
Hartsburg, IL
- Average cloud cover in December: 52
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in December
Hartsburg, 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).
Hartsburg, Illinois, USA
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