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 shift from November to December involves a decrease in the average high-temperature, from a chilly 45.9°F (7.7°C) to a cold 36.1°F (2.3°C). Williamson experiences a steady nighttime temperature of 28.8°F (-1.8°C) throughout the month of December.Humidity
In December, the average relative humidity in Williamson is 81%.Rainfall
In Williamson, in December, it is raining for 10.5 days, with typically 2.76" (70mm) of accumulated precipitation. In Williamson, New York, during the entire year, the rain falls for 171.8 days and collects up to 32.76" (832mm) of precipitation.Snowfall
Months with snowfall in Williamson are January through May, October through December. In Williamson, New York, in December, during 14.5 snowfall days, 5.31" (135mm) of snow is typically accumulated. Throughout the year, there are 67.1 snowfall days, and 22.99" (584mm) of snow is accumulated.Daylight
The month with the shortest days in Williamson is December, with an average of 9h and 0min of daylight.On the first day of December in Williamson, sunrise is at 7:21 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 4:43 pm EST.
Sunshine
The average sunshine in December is 3h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: In December, the maximum UV index of 1 transforms into these recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Williamson in December?
What is the average humidity in December in Williamson?
How much does it rain in Williamson in December?
How many days does it snow in December in Williamson?
What is the month with the shortest days in Williamson?
How many hours of daylight does Williamson have in December?
When are sunrise and sunset in December in Williamson?
How many hours of sunshine does Williamson have in December?
When is the lowest UV index in Williamson?
What is the UV index intensity in December in Williamson?
Average temperature in December
Williamson, NY
- Average high temperature in December: 36.1°F
The warmest month (with the highest average high temperature) is July (76.5°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 28.8°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in December
Williamson, 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
Williamson, NY
- Average wind speed in December: 12.6mph
The windiest month (with the highest average wind speed) is January (13.1mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in December
Williamson, NY
- Average humidity in December: 81%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is September (76%).
Average rainfall in December
Williamson, NY
- Average rainfall in December: 2.76"
The wettest month (with the highest rainfall) is October (3.62").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in December
Williamson, NY
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is February (7.9 days).
Average snowfall in December
Williamson, NY
- Average snowfall in December: 5.31"
The month with the highest snowfall is February (6.26").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Williamson, NY
- Average snowfall days in December: 14.5 days
The month with the highest number of snowfall days is January (16.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Williamson, NY
- Average daylight in December: 9h and 0min
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 0min).
- Average sunshine in December: 3h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in December
Williamson, NY
- Average sunshine days in December: 7 days
The month with the most sunshine days is May (12.7 days).
The month with the least sunshine days is February (6.3 days).
Average UV index in December
Williamson, 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
Williamson, NY
- Average cloud cover in December: 71
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in December
Williamson, NY
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
Williamson, New York, USA
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