December weather forecastHerrick, IL
December
Weather in December
The first month of the winter, December, is still a cold month in Herrick, Illinois, with an average temperature fluctuating between 29.5°F (-1.4°C) and 40.6°F (4.8°C).Temperature
December comes with a decrease in the average high-temperature, falling from a fresh 51.4°F (10.8°C) in November to a wintry 40.6°F (4.8°C). December nights are marked by an average temperature drop to a subzero cold 29.5°F (-1.4°C).Humidity
The average relative humidity in December in Herrick is 78%.Rainfall
In Herrick, in December, it is raining for 8.9 days, with typically 1.5" (38mm) of accumulated precipitation. Throughout the year, in Herrick, there are 139.3 rainfall days, and 23.94" (608mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. December is the month with the most snowfall. Snow falls for 3.5 days and accumulates 1.65" (42mm) of snow.Daylight
The month with the shortest days in Herrick is December, with an average of 9h and 30min of daylight.On the first day of December in Herrick, Illinois, sunrise is at 6:57 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:43 pm CST.
Sunshine
The average sunshine in December is 4.6h.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 minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: In December, a regular UV index of 2 translates into these guidelines:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Herrick, IL
- Average high temperature in December: 40.6°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in December: 29.5°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 (23.4°F).
Average pressure in December
Herrick, 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 (29.93"Hg).
Average wind speed in December
Herrick, IL
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in December
Herrick, IL
- Average humidity in December: 78%
The months with the highest relative humidity are July and August (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Herrick, IL
- Average rainfall in December: 1.5"
The wettest months (with the highest rainfall) are April and June (2.95").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days in December
Herrick, IL
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in December
Herrick, IL
- Average snowfall in December: 1.65"
The month with the highest snowfall is December (1.65").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Herrick, IL
- Average snowfall days in December: 3.5 days
The month with the highest number of snowfall days is January (5.7 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
Herrick, IL
- Average daylight in December: 9h and 30min
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 36min
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
Herrick, IL
- Average sunshine days in December: 19.2 days
The months with the most sunshine days are January and November (19.5 days).
The months with the least sunshine days are May and July (12.3 days).
Average UV index in December
Herrick, 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
Herrick, IL
- Average cloud cover in December: 51
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June and July (Cloud cover 29).
Average visibility in December
Herrick, 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).
