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 start of December signals a decrease in the average high-temperature, transitioning from an icy 41.9°F (5.5°C) in November to a still cold 32°F (0°C). During the month of December, the nighttime temperature in Jefferson, New York, falls to an average of 21.7°F (-5.7°C).Humidity
February and December, with an average relative humidity of 87%, are the most humid months in Jefferson.Rainfall
In Jefferson, during December, the rain falls for 8.4 days and regularly aggregates up to 2.05" (52mm) of precipitation. In Jefferson, during the entire year, the rain falls for 150.7 days and collects up to 27.83" (707mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Jefferson, New York. December is the month with the most snowfall in Jefferson. Snow falls for 18 days and accumulates 9.84" (250mm) of snow.Daylight
December has the shortest days of the year in Jefferson, with an average of 9h and 6min of daylight.On the first day of the month, sunrise is at 7:08 am and sunset at 4:26 pm. On the last day of December, sunrise is at 7:27 am and sunset at 4:35 pm EST.
Sunshine
The average sunshine in December is 3h.UV index
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: In December, the average maximum UV index of 1 translates into the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Experience reduced UV exposure by about half when donning a wide-brim hat. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Jefferson?
What is the most humid month in Jefferson?
What is the average humidity in December in Jefferson?
How many days does it rain in December in Jefferson?
What is the snowiest month in Jefferson?
How many days does it snow in December in Jefferson?
What is the month with the shortest days in Jefferson?
What is the average length of the day in December in Jefferson?
What time are sunrise and sunset in December in Jefferson?
How long on average sun shines in December in Jefferson?
What are the months with the lowest UV index in Jefferson?
What is the UV index intensity in December in Jefferson?
Average temperature in December
Jefferson, NY
- Average high temperature in December: 32°F
The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in December: 21.7°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure in December
Jefferson, NY
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Jefferson, NY
- Average wind speed in December: 8.7mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in December
Jefferson, NY
- Average humidity in December: 87%
The months with the highest relative humidity are February and December (87%).
The months with the lowest relative humidity are April, May, June and July (80%).
Average rainfall in December
Jefferson, NY
- Average rainfall in December: 2.05"
The wettest month (with the highest rainfall) is August (3.27").
The driest month (with the least rainfall) is January (1.5").
Average rainfall days in December
Jefferson, NY
- Average rainfall days in December: 8.4 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (4.6 days).
Average snowfall in December
Jefferson, NY
- Average snowfall in December: 9.84"
The month with the highest snowfall is December (9.84").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Jefferson, NY
- Average snowfall days in December: 18 days
The month with the highest number of snowfall days is January (19 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Jefferson, NY
- 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 6min).
- Average sunshine in December: 3h and 0min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 2h and 48min).
Average sunshine days in December
Jefferson, NY
- Average sunshine days in December: 9.3 days
The month with the most sunshine days is September (15 days).
The month with the least sunshine days is February (7.5 days).
Average UV index in December
Jefferson, NY
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in December
Jefferson, NY
- Average cloud cover in December: 71
The month with the most cloud cover is February (Cloud cover 73).
The month with the least cloud cover is July (Cloud cover 42).
Average visibility in December
Jefferson, NY
- Average visibility in December: 5mi
The months with the highest visibility are January, April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are February, March and September (4mi).
Jefferson, New York, USA
Weather forecast for your location
2. Allow the app to use your location