December weather forecastManhattan, IL
December
Weather in December
The first month of the winter, December, is also a wintry month in Manhattan, Illinois, with an average temperature varying between 25°F (-3.9°C) and 35.1°F (1.7°C).Temperature
December involves a decrease in temperature, down from a frosty 46.9°F (8.3°C) in November to an icy 35.1°F (1.7°C). In Manhattan, the expected average low-temperature for December is a subzero cold 25°F (-3.9°C).Humidity
In Manhattan, the average relative humidity in December is 81%.Rainfall
The months with the least rainfall are February and December Rain falls for 7.6 days and accumulates 1.61" (41mm) of rain.Snowfall
Months with snowfall are January through April, October through December. In Manhattan, during December, snow falls for 9 days and regularly aggregates up to 2.44" (62mm) of snow. In Manhattan, during the entire year, snow falls for 42.2 days and aggregates up to 14.65" (372mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Manhattan.On the first day of the month, sunrise is at 6:59 am and sunset at 4:23 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:32 pm CST.
Sunshine
The average sunshine in December is 4h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: In December, the maximum UV index of 1 translates into these guidelines:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Manhattan, IL
- Average high temperature in December: 35.1°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in December: 25°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 (17.4°F).
Average pressure in December
Manhattan, IL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Manhattan, IL
- Average wind speed in December: 9.1mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Manhattan, IL
- Average humidity in December: 81%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in December
Manhattan, IL
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is May (4.21").
The driest months (with the least rainfall) are February and December (1.61").
Average rainfall days in December
Manhattan, IL
- Average rainfall days in December: 7.6 days
The months with the highest number of rainy days are June and July (17.3 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in December
Manhattan, IL
- Average snowfall in December: 2.44"
The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Manhattan, IL
- Average snowfall days in December: 9 days
The month with the highest number of snowfall days is January (12.3 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
Manhattan, IL
- Average daylight in December: 9h and 12min
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 12min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Manhattan, IL
- Average sunshine days in December: 15.6 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is April (10.7 days).
Average UV index in December
Manhattan, 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
Manhattan, IL
- Average cloud cover in December: 59
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Manhattan, IL
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
