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 sea temperature 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
In Rochester, the average high-temperature in December decreases from a chilly 45.9°F (7.7°C) in November to a cold 36°F (2.2°C). In December, the average low-temperature is 27.5°F (-2.5°C).Humidity
In Rochester, the average relative humidity in December is 83%.Rainfall
In December, the rain falls for 11.5 days. Throughout December, 2.48" (63mm) of precipitation is accumulated. In Rochester, during the entire year, the rain falls for 172.4 days and collects up to 29.45" (748mm) of precipitation.Snowfall
Months with snowfall in Rochester are January through May, October through December. In Rochester, New York, during 14.2 snowfall days, 5.31" (135mm) of snow is typically accumulated. In Rochester, during the entire year, snow falls for 70.9 days and aggregates up to 27.44" (697mm) of snow.Ocean temperature
In Rochester, New York, in December, the average water temperature is 41.7°F (5.4°C).Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.
Daylight
With an average of 9h and 3min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:22 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:42 am and sunset at 4:44 pm EST.
Sunshine
In Rochester, the average sunshine in December is 3.1h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Rochester. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the average person.Note: The daily maximum UV index of 1 in December interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
FAQ
What is the temperature in December in Rochester?
What is the average humidity in December in Rochester?
How many days does it rain in December in Rochester?
How many days does it snow in December in Rochester?
What is the water temperature in December in Rochester?
What is the month with the shortest days in Rochester?
What is the average length of the day in December in Rochester?
When is the sunrise / sunset in December in Rochester?
How long on average sun shines in December in Rochester?
When is the lowest UV index in Rochester?
What is the UV index reading in December in Rochester?
Average temperature in December
Rochester, NY
- Average high temperature in December: 36°F
The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Rochester, NY
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Rochester, NY
- Average wind speed in December: 10.7mph
The windiest month (with the highest average wind speed) is January (11.6mph).
The calmest month (with the lowest average wind speed) is July (7mph).
Average humidity in December
Rochester, NY
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are August and September (76%).
Average rainfall in December
Rochester, NY
- Average rainfall in December: 2.48"
The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in December
Rochester, NY
- Average rainfall days in December: 11.5 days
The month with the highest number of rainy days is August (18.7 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in December
Rochester, NY
- Average snowfall in December: 5.31"
The month with the highest snowfall is February (7.01").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rochester, NY
- Average snowfall days in December: 14.2 days
The month with the highest number of snowfall days is January (17.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in December
Rochester, NY
- Average sea temperature in December: 41.7°F
The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is March (35.8°F).
Average daylight in December /
Average sunshine in December
Rochester, NY
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 15h and 20min).
The month with the shortest days is December (Average daylight: 9h and 3min).
- Average sunshine in December: 3h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 2h and 42min).
Average sunshine days in December
Rochester, NY
- Average sunshine days in December: 8.4 days
The month with the most sunshine days is September (13.9 days).
The month with the least sunshine days is February (6.7 days).
Average UV index in December
Rochester, NY
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Rochester, NY
- Average cloud cover in December: 69
The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Rochester, NY
- 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).
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