December weather forecast
Willis, MI

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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.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in Willis in December?

The high-temperature in Willis, Michigan, during December is 34.9°F (1.6°C) and the low-temperature is 26.2°F (-3.2°C).

What is the average humidity in December in Willis?

In December, the average relative humidity in Willis is 82%.

How many days does it rain in December in Willis?

In Willis, in December, during 4.8 rainfall days, 0.31" (8mm) of precipitation is typically accumulated.

How much does it snow in Willis in December?

In Willis, during December, snow falls for 5.5 days and regularly aggregates up to 0.16" (4mm) of snow.

What is the month with the shortest days in Willis?

December has the shortest days of the year in Willis, Michigan, with an average of 9h and 12min of daylight.

How many hours of daylight does Willis have in December?

In Willis, the average day length in December is 9h and 10min.

When is the sunrise / sunset in December in Willis?

In December, on the first day of the month, sunrise is at 7:43 am and sunset at 5:03 pm. On the last day of the month, in Willis, sunrise is at 8:02 am and sunset at 5:12 pm EST.

How long on average sun shines in December in Willis?

The average sunshine duration in December in Willis is 3.6h.

When is the lowest UV index in Willis?

With an average maximum UV index of 1, December is the month with the lowest UV index in Willis, Michigan.

What is the UV index intensity in December in Willis?

In Willis, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Willis, MI

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in December - Willis, MI
  • Average daylight in December: 9h and 1min

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 4min

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 - 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 - 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 - 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 - 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).

Willis, Michigan, USA

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