December weather forecastWillis, MI
December
Weather in December
December, the first month of the winter in Willis, is also an icy month, with an average temperature varying between 26.2°F (-3.2°C) and 34.9°F (1.6°C).Temperature
The decrease of average high-temperatures is mild in December, with a decline from a frosty 45.9°F (7.7°C) in November to an icy 34.9°F (1.6°C). Willis's nocturnal average in December closely mirrors its daytime temperatures, settling at a freezing cold 26.2°F (-3.2°C).Humidity
In Willis, the average relative humidity in December is 82%.Rainfall
In Willis, during December, the rain falls for 4.8 days and regularly aggregates up to 0.31" (8mm) of precipitation. Throughout the year, in Willis, there are 85.1 rainfall days, and 5.98" (152mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Willis, Michigan, in December, during 5.5 snowfall days, 0.16" (4mm) of snow is typically accumulated. In Willis, Michigan, during the entire year, snow falls for 29.9 days and aggregates up to 2.44" (62mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Willis, Michigan.On the first day of the month, sunrise is at 7:43 am and sunset at 5:03 pm. On the last day of December, in Willis, sunrise is at 8:02 am and sunset at 5:12 pm EST.
Sunshine
In December, the average sunshine in Willis is 3.6h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum high UV index of 1 in December translates into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Willis, MI
- Average high temperature in December: 34.9°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (29.5°F).
- Average low temperature in December: 26.2°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in December
Willis, MI
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Willis, MI
- Average wind speed in December: 9.6mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in December
Willis, MI
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are March, April and October (76%).
Average rainfall in December
Willis, MI
- Average rainfall in December: 0.31"
The wettest month (with the highest rainfall) is May (0.75").
The driest month (with the least rainfall) is September (0.28").
Average rainfall days in December
Willis, MI
- Average rainfall days in December: 4.8 days
The months with the highest number of rainy days are April and May (10.2 days).
The month with the least rainy days is February (3.5 days).
Average snowfall in December
Willis, MI
- Average snowfall in December: 0.16"
The month with the highest snowfall is January (0.87").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Willis, MI
- Average snowfall days in December: 5.5 days
The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Willis, MI
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 3h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in December
Willis, MI
- Average sunshine days in December: 23.6 days
The month with the most sunshine days is December (23.6 days).
The month with the least sunshine days is April (17.4 days).
Average UV index in December
Willis, MI
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Willis, MI
- Average cloud cover in December: 63
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in December
Willis, MI
- 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).
