December weather forecastAnn Arbor, MI
December
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
Welcoming December, Ann Arbor observes a shift in the average high-temperature, falling from November's chilly 45.5°F (7.5°C) to an icy 34.7°F (1.5°C). Ann Arbor registers an average low-temperature of 25.7°F (-3.5°C) throughout December, a modest decrease from its daytime highs.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
January through May, October through December are months with snowfall. 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, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:44 am and sunset at 5:03 pm. On the last day of December, in Ann Arbor, sunrise is at 8:03 am and sunset at 5:12 pm EST.
Sunshine
In Ann Arbor, the average sunshine in December is 3.5h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.Note: A typical high UV index of 1 in December suggests the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. 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
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in December /
Average sunshine in December
Ann Arbor, MI
- Average daylight in December: 9h and 6min
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 30min
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).
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).
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).
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).
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).
