December weather forecastMonmouth, IL
December
Weather in December
The first month of the winter, December, is still a cold month in Monmouth, Illinois, with temperature in the range of an average high of 35.6°F (2°C) and an average low of 24.6°F (-4.1°C).Temperature
Monmouth's December weather features a mild decline in high-temperatures, reducing from a frosty 47.5°F (8.6°C) in November to an icy 35.6°F (2°C). Throughout December, the temperature falls to an average low of 24.6°F (-4.1°C).Humidity
In December, the average relative humidity is 80%.Rainfall
In Monmouth, during December, the rain falls for 7.5 days and regularly aggregates up to 1.5" (38mm) of precipitation. In Monmouth, during the entire year, the rain falls for 149.4 days and collects up to 30.16" (766mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In Monmouth, in December, during 8.2 snowfall days, 2.2" (56mm) of snow is typically accumulated. In Monmouth, Illinois, during the entire year, snow falls for 36.7 days and aggregates up to 15.31" (389mm) 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 Monmouth, sunrise is at 7:08 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:44 pm CST.
Sunshine
In Monmouth, the average sunshine in December is 4.5h.UV index
The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum UV index of 2 in December translates into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Monmouth, IL
- Average high temperature in December: 35.6°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 24.6°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).
Average pressure in December
Monmouth, 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 (29.9"Hg).
Average wind speed in December
Monmouth, IL
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in December
Monmouth, IL
- Average humidity in December: 80%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Monmouth, IL
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is May (4.25").
The driest month (with the least rainfall) is January (1.46").
Average rainfall days in December
Monmouth, IL
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in December
Monmouth, IL
- Average snowfall in December: 2.2"
The month with the highest snowfall is January (4.61").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Monmouth, IL
- Average snowfall days in December: 8.2 days
The month with the highest number of snowfall days is January (10.9 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
Monmouth, IL
- Average daylight in December: 9h and 18min
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 30min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Monmouth, IL
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in December
Monmouth, 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
Monmouth, IL
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in December
Monmouth, IL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
