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
In Williamstown, the average high-temperature in December decreases from a chilly 48°F (8.9°C) in November to an icy 37°F (2.8°C). Williamstown anticipates an average minimum temperature of 27.5°F (-2.5°C) in the month of December.Humidity
The average relative humidity in December is 83%.Rainfall
December is the month with the least rainfall. Rain falls for 10.5 days and accumulates 1.81" (46mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Williamstown. In Williamstown, in December, during 10.8 snowfall days, 2.52" (64mm) of snow is typically accumulated. Throughout the year, there are 48.9 snowfall days, and 13.23" (336mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:40 am and sunset at 5:07 pm. On the last day of the month, sunrise is at 7:58 am and sunset at 5:17 pm EST.
Sunshine
In December, the average sunshine is 3.9h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum daily UV index of 1 during December morphs into the following directions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. To guard against the harmful effects of the Sun, minimize exposure during midday. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
What is the driest month?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Williamstown, OH
- Average high temperature in December: 37°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (31.1°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Williamstown, OH
- Average pressure in December: 30.11"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
Williamstown, OH
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in December
Williamstown, OH
- 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 October and November (75%).
Average rainfall in December
Williamstown, OH
- Average rainfall in December: 1.81"
The wettest month (with the highest rainfall) is June (3.54").
The driest month (with the least rainfall) is December (1.81").
Average rainfall days in December
Williamstown, OH
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (8.4 days).
Average snowfall in December
Williamstown, OH
- Average snowfall in December: 2.52"
The month with the highest snowfall is February (3.74").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Williamstown, OH
- Average snowfall days in December: 10.8 days
The month with the highest number of snowfall days is January (13.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Williamstown, 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 5min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Williamstown, OH
- Average sunshine days in December: 11.7 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is June (9.3 days).
Average UV index in December
Williamstown, OH
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Williamstown, OH
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Williamstown, OH
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are January, February, August and September (5mi).
Williamstown, Ohio, USA
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