December weather forecast
Ann Arbor, MI

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The vast University of Michigan Law School Campus in Ann Arbor, Michigan
The vast University of Michigan Law School Campus in Ann Arbor, Michigan

Weather in December

In December, Ann Arbor is in the midst of winter with frequent snowfall, freezing temperatures, and short days. The city's cold winter combines with the holiday season to create a festive ambiance. As families gather for holiday celebrations, snow-covered streets and holiday lights make Ann Arbor a winter wonderland. The month's end ushers in the new year, wrapping up a full circle of diverse and ever-changing weather. A notable characteristic in December's weather is the decrease in daylight hours to an average of 9.1hr, the shortest in the year.

Temperature

A moderate decline in the average high-temperature is seen during December, decreasing from a frosty 45.5°F (7.5°C) in November to an icy 34.7°F (1.5°C). Night temperatures during December in Ann Arbor stabilize at an average of 25.7°F (-3.5°C), closely mirroring the daytime temperatures.

Humidity

In Ann Arbor, the average relative humidity in December is 83%.

Rainfall

December is the month with the least rainfall. Rain falls for 7.6 days and accumulates 0.87" (22mm) of precipitation.

Snowfall

Months with snowfall in Ann Arbor are January through May, October through December. In Ann Arbor, during December, snow falls for 8.5 days and regularly aggregates up to 1.26" (32mm) of snow. Throughout the year, there are 45 snowfall days, and 9.69" (246mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Ann Arbor, with an average of 9h and 6min of daylight.
On the first day of December, sunrise is at 7:44 am and sunset at 5:03 pm. On the last day of the month, sunrise is at 8:03 am and sunset at 5:12 pm EST.

Sunshine

In December, the average sunshine is 3.5h.

UV index

The month with the lowest UV index in Ann Arbor is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.
Note: A maximum daily UV index of 1 during December morphs into the following directions:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
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Frequently asked questions

How cold is December in Ann Arbor?

The average high-temperature and low-temperature in Ann Arbor, Michigan, during December are 34.7°F (1.5°C) and 25.7°F (-3.5°C) respectively.

What is the average humidity in December in Ann Arbor?

The average relative humidity in December in Ann Arbor, Michigan, is 83%.

What is the driest month in Ann Arbor?

December is the month with the least rainfall. Rain falls for 7.6 days and accumulates 0.87" (22mm) of precipitation.

How many days does it rain in December in Ann Arbor?

In Ann Arbor, in December, it is raining for 7.6 days, with typically 0.87" (22mm) of accumulated precipitation.

How many days does it snow in December in Ann Arbor?

In Ann Arbor, in December, snow falls for 8.5 days, with typically accumulated 1.26" (32mm) of snow.

What is the month with the shortest days in Ann Arbor?

The month with the shortest days is December, with an average of 9h and 6min of daylight.

How many hours of daylight does Ann Arbor have in December?

The average day length in December is 9h and 9min.

When are sunrise and sunset in December in Ann Arbor?

In December, on the first day of the month, sunrise is at 7:44 am and sunset at 5:03 pm. On the last day of the month, in Ann Arbor, Michigan, sunrise is at 8:03 am and sunset at 5:12 pm EST.

How long on average sun shines in December in Ann Arbor?

The average sunshine duration in December in Ann Arbor, Michigan, is 3.5h.

What is the month with the lowest UV index in Ann Arbor?

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

What is the UV index reading in December in Ann Arbor?

In December, the average daily maximum UV index in Ann Arbor is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to 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
Ann Arbor, MI

Average temperature in December - Ann Arbor, MI
  • Average high temperature in December: 34.7°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (28.2°F).

  • Average low temperature in December: 25.7°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).

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Average pressure in December
Ann Arbor, MI

Average pressure in December - Ann Arbor, MI
  • Average pressure in December: 30.08"Hg

The months with the highest atmospheric pressure are March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
Ann Arbor, MI

Average wind speed in December - Ann Arbor, MI
  • Average wind speed in December: 9.6mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).

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Average humidity in December
Ann Arbor, MI

Average humidity in December - Ann Arbor, MI
  • Average humidity in December: 83%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (76%).

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Average rainfall in December
Ann Arbor, MI

Average rainfall in December - Ann Arbor, MI
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is May (2.4").
The driest month (with the least rainfall) is December (0.87").

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Average rainfall days in December
Ann Arbor, MI

Average rainfall days in December - Ann Arbor, MI
  • Average rainfall days in December: 7.6 days

The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is January (5.2 days).

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Average snowfall in December
Ann Arbor, MI

Average snowfall in December - Ann Arbor, MI
  • Average snowfall in December: 1.26"

The month with the highest snowfall is February (2.72").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Ann Arbor, MI

Average snowfall days in December - Ann Arbor, MI
  • Average snowfall days in December: 8.5 days

The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Ann Arbor, MI

Average daylight in December / Average sunshine in December - Ann Arbor, 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 6min).

  • Average sunshine in December: 3h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

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Average sunshine days in December
Ann Arbor, MI

Average sunshine days in December - Ann Arbor, MI
  • Average sunshine days in December: 16.6 days

The month with the most sunshine days is October (17.5 days).
The month with the least sunshine days is July (10.3 days).

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Average UV index in December
Ann Arbor, MI

Average UV index in December - Ann Arbor, 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).

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Average cloud cover in December
Ann Arbor, MI

Average cloud cover in December - Ann Arbor, MI
  • Average cloud cover in December: 63

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 29).

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Average visibility in December
Ann Arbor, MI

Average visibility in December - Ann Arbor, MI
  • Average visibility in December: 6mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

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Ann Arbor, Michigan, USA

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