December weather forecastPleasant Hill, IL
December
Weather in December
The first month of the winter, December, is also a wintry month in Pleasant Hill, Illinois, with temperature in the range of an average low of 28.2°F (-2.1°C) and an average high of 40.5°F (4.7°C).Temperature
Pleasant Hill's progression into December involves a drop in the average high-temperature, receding from a fresh 51.6°F (10.9°C) in November to a cold 40.5°F (4.7°C). Throughout December, Pleasant Hill witnesses a nighttime temperature average of 28.2°F (-2.1°C).Humidity
In December, the average relative humidity is 77%.Rainfall
In Pleasant Hill, in December, during 7.6 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Pleasant Hill, during the entire year, the rain falls for 142.7 days and collects up to 27.64" (702mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Pleasant Hill, during December, snow falls for 4.5 days and regularly aggregates up to 1.38" (35mm) of snow. In Pleasant Hill, during the entire year, snow falls for 26.1 days and aggregates up to 9.45" (240mm) 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 4:40 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:50 pm CST.
Sunshine
In December, the average sunshine in Pleasant Hill, Illinois, is 4.8h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 2 in December translates into this advice:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Pleasant Hill, IL
- Average high temperature in December: 40.5°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in December: 28.2°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 (22.1°F).
Average pressure in December
Pleasant Hill, 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
Pleasant Hill, IL
- Average wind speed in December: 9.3mph
The windiest months (with the highest average wind speed) are January and February (9.7mph).
The calmest month (with the lowest average wind speed) is July (6mph).
Average humidity in December
Pleasant Hill, IL
- Average humidity in December: 77%
The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Pleasant Hill, IL
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is February (1.46").
Average rainfall days in December
Pleasant Hill, IL
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is May (17.3 days).
The months with the least rainy days are January and February (6.3 days).
Average snowfall in December
Pleasant Hill, IL
- Average snowfall in December: 1.38"
The month with the highest snowfall is January (3.03").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Pleasant Hill, IL
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is January (8.5 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
Pleasant Hill, IL
- Average daylight in December: 9h and 24min
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 48min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The months with the least sunshine are January and February (Average sunshine: 4h and 30min).
Average sunshine days in December
Pleasant Hill, IL
- Average sunshine days in December: 19.2 days
The month with the most sunshine days is December (19.2 days).
The month with the least sunshine days is June (10.9 days).
Average UV index in December
Pleasant Hill, 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
Pleasant Hill, 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 30).
Average visibility in December
Pleasant Hill, 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).
