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
Onset of December comes with a temperature decline, the average high falling from a frosty 47.3°F (8.5°C) in November to a cold 37.4°F (3°C). During the nights in December, Rochester experiences a consistent average temperature of 28.2°F (-2.1°C).Humidity
In December, the average relative humidity is 82%.Rainfall
February, November and December are months with the least rain when the rain falls for 12.4 days and typically aggregates up to 1.93" (49mm) of rain.Snowfall
Months with snowfall in Rochester are January through May, October through December. In Rochester, during December, snow falls for 11.8 days and regularly aggregates up to 3.46" (88mm) of snow. In Rochester, during the entire year, snow falls for 59.3 days and aggregates up to 17.32" (440mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:35 am and sunset at 5:01 pm. On the last day of December, in Rochester, sunrise is at 7:54 am and sunset at 5:10 pm EST.
Sunshine
In December, the average sunshine 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 of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 1 suggests this advice:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
How cold is December in Rochester?
What is the average humidity in December in Rochester?
What is the driest month in Rochester?
How much does it rain in Rochester in December?
How much does it snow in Rochester in December?
What is the month with the shortest days in Rochester?
What is the average length of the day in December in Rochester?
When are sunrise and sunset in December in Rochester?
How many hours of sunshine does Rochester have in December?
When is the lowest UV index in Rochester?
How high is the UV index in December in Rochester?
Average temperature in December
Rochester, OH
- Average high temperature in December: 37.4°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (30.9°F).
- Average low temperature in December: 28.2°F
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Rochester, OH
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Rochester, OH
- Average wind speed in December: 10.2mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity in December
Rochester, OH
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is November (76%).
Average rainfall in December
Rochester, OH
- Average rainfall in December: 1.93"
The wettest month (with the highest rainfall) is June (3.62").
The driest months (with the least rainfall) are February, November and December (1.93").
Average rainfall days in December
Rochester, OH
- Average rainfall days in December: 12.4 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is January (8.8 days).
Average snowfall in December
Rochester, OH
- Average snowfall in December: 3.46"
The month with the highest snowfall is February (4.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rochester, OH
- Average snowfall days in December: 11.8 days
The month with the highest number of snowfall days is January (16.2 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, OH
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 3h and 3min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in December
Rochester, OH
- Average sunshine days in December: 10.5 days
The month with the most sunshine days is September (12.9 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in December
Rochester, OH
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Rochester, OH
- Average cloud cover in December: 63
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Rochester, OH
- 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, Ohio, USA
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