Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The move into December indicates a reduction in the average high-temperature, down from November's frosty 45.1°F (7.3°C) to an icy 34.3°F (1.3°C). Rochester records a consistent average nighttime temperature of 25.9°F (-3.4°C) in December, slightly lower than the daytime high.Humidity
In Rochester, the average relative humidity in December is 82%.Rainfall
The months with the least rainfall are February and December Rain falls for 8.8 days and accumulates 1.02" (26mm) of rain.Snowfall
January through May, October through December are months with snowfall. In Rochester, in December, snow falls for 13.9 days, with typically accumulated 2.4" (61mm) of snow. Throughout the year, there are 62.5 snowfall days, and 14.09" (358mm) 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 7:43 am and sunset at 4:59 pm. On the last day of December, in Rochester, sunrise is at 8:02 am and sunset at 5:09 pm EST.
Sunshine
The average sunshine in December is 3.4h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: The UV index of 1 during December leads to these advisories:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
What is the driest month?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Rochester have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Rochester, MI
- Average high temperature in December: 34.3°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in December: 25.9°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 (17.8°F).
Average pressure in December
Rochester, MI
- Average pressure in December: 30.07"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
Rochester, 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 (6.5mph).
Average humidity in December
Rochester, MI
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are April, May, July and August (75%).
Average rainfall in December
Rochester, MI
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is May (2.28").
The driest months (with the least rainfall) are February and December (1.02").
Average rainfall days in December
Rochester, MI
- Average rainfall days in December: 8.8 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (6.4 days).
Average snowfall in December
Rochester, MI
- Average snowfall in December: 2.4"
The month with the highest snowfall is February (4.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rochester, MI
- Average snowfall days in December: 13.9 days
The month with the highest number of snowfall days is January (15.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rochester, MI
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 3h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in December
Rochester, MI
- Average sunshine days in December: 12.3 days
The month with the most sunshine days is November (14.9 days).
The month with the least sunshine days is February (9.8 days).
Average UV index in December
Rochester, MI
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Rochester, MI
- Average cloud cover in December: 64
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
Rochester, MI
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Rochester, Michigan, USA
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