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, from a fresh 51.4°F (10.8°C) to an icy 40.3°F (4.6°C). Hillsboro's temperature in December lowers to a consistent average of 28.9°F (-1.7°C) during the nights.Humidity
The average relative humidity in December in Hillsboro is 78%.Rainfall
In Hillsboro, during December, the rain falls for 7.8 days and regularly aggregates up to 1.5" (38mm) of precipitation. Throughout the year, in Hillsboro, there are 138.5 rainfall days, and 24.33" (618mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall. In December, in Hillsboro, Illinois, it is snowing for 4.5 days. Throughout December, 1.57" (40mm) of snow is accumulated. In Hillsboro, during the entire year, snow falls for 20.6 days and aggregates up to 6.3" (160mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 6:58 am and sunset at 4:35 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:45 pm CST.
Sunshine
In December, the average sunshine in Hillsboro is 4.8h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 2 during December leads to these advisories:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Frequently asked questions
How cold is it in Hillsboro in December?
What is the average humidity in December in Hillsboro?
How much does it rain in Hillsboro in December?
How much does it snow in Hillsboro in December?
What is the month with the shortest days in Hillsboro?
What is the average length of the day in December in Hillsboro?
What time are sunrise and sunset in December in Hillsboro?
How many hours of sunshine does Hillsboro have in December?
What are the months with the lowest UV index in Hillsboro?
What is the UV index reading in December in Hillsboro?
Average temperature in December
Hillsboro, IL
- Average high temperature in December: 40.3°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in December: 28.9°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in December
Hillsboro, IL
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Hillsboro, IL
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in December
Hillsboro, IL
- Average humidity in December: 78%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Hillsboro, IL
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is June (3.35").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days in December
Hillsboro, IL
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7 days).
Average snowfall in December
Hillsboro, IL
- Average snowfall in December: 1.57"
The month with the highest snowfall is February (1.81").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Hillsboro, IL
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is January (6.2 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
Hillsboro, IL
- Average daylight in December: 9h and 3min
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 30min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Hillsboro, IL
- Average sunshine days in December: 19.2 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in December
Hillsboro, 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
Hillsboro, IL
- Average cloud cover in December: 50
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June and September (Cloud cover 29).
Average visibility in December
Hillsboro, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Hillsboro, Illinois, USA
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