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
With the arrival of December, Rochester notices a mild change in the average high-temperature, sliding from November's fresh 50.9°F (10.5°C) to an icy 42.3°F (5.7°C). December nights in Rochester reveal a minor deviation from daytime highs, with a mean low-temperature of 33.6°F (0.9°C).Humidity
In December, the average relative humidity in Rochester is 76%.Rainfall
In Rochester, in December, it is raining for 10.3 days, with typically 1.5" (38mm) of accumulated precipitation. Throughout the year, there are 136.3 rainfall days, and 15.63" (397mm) of precipitation is accumulated.Snowfall
Months with snowfall in Rochester, Massachusetts, are January through May, October through December. In December, in Rochester, it is snowing for 3.2 days. Throughout December, 0.75" (19mm) of snow is accumulated. In Rochester, during the entire year, snow falls for 21.6 days and aggregates up to 4.29" (109mm) of snow.Daylight
December has the shortest days of the year in Rochester, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 6:51 am and sunset at 4:13 pm. On the last day of December, sunrise is at 7:10 am and sunset at 4:22 pm EST.
Sunshine
In December, the average sunshine in Rochester is 4.9h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: During December, 2 as the daily maximum UV index converts into the following advice:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. When the Sun is at its strongest around midday, find shade and limit exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
Is it cold in Rochester during December?
What is the average humidity in December 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?
What time are sunrise and sunset in December in Rochester?
How long on average sun shines in December in Rochester?
What is the month with the lowest UV index in Rochester?
What is the UV index reading in December in Rochester?
Average temperature in December
Rochester, MA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is January (36.7°F).
- Average low temperature in December: 33.6°F
The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is January (27.3°F).
Average pressure in December
Rochester, MA
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Rochester, MA
- Average wind speed in December: 12.3mph
The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).
Average humidity in December
Rochester, MA
- Average humidity in December: 76%
The months with the highest relative humidity are June and July (80%).
The months with the lowest relative humidity are March and November (74%).
Average rainfall in December
Rochester, MA
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is October (1.89").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in December
Rochester, MA
- Average rainfall days in December: 10.3 days
The months with the highest number of rainy days are May and July (14.1 days).
The month with the least rainy days is February (7.7 days).
Average snowfall in December
Rochester, MA
- Average snowfall in December: 0.75"
The month with the highest snowfall is February (1.1").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rochester, MA
- Average snowfall days in December: 3.2 days
The month with the highest number of snowfall days is January (6.6 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, MA
- 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 12min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Rochester, MA
- Average sunshine days in December: 17.7 days
The month with the most sunshine days is December (17.7 days).
The month with the least sunshine days is April (14.3 days).
Average UV index in December
Rochester, MA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Rochester, MA
- Average cloud cover in December: 48
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Rochester, MA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Rochester, Massachusetts, USA
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