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
Transition from November to December is accompanied by a temperature drop, with average high-temperatures decreasing from a fresh 50°F (10°C) to a cold 40.1°F (4.5°C). Williamstown records a steady low-temperature average of 29.3°F (-1.5°C) during December.Humidity
January and December, with an average relative humidity of 82%, are the most humid months.Rainfall
In Williamstown, in December, during 10.7 rainfall days, 2.32" (59mm) of precipitation is typically accumulated. In Williamstown, Indiana, during the entire year, the rain falls for 161.3 days and collects up to 31.26" (794mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In December, it is snowing for 7.8 days. Throughout December, 1.77" (45mm) of snow is accumulated. In Williamstown, during the entire year, snow falls for 35 days and aggregates up to 10.67" (271mm) of snow.Daylight
December has the shortest days of the year in Williamstown, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:43 am and sunset at 5:18 pm. On the last day of the month, sunrise is at 8:01 am and sunset at 5:28 pm EST.
Sunshine
The average sunshine in December in Williamstown is 4h.UV index
The month with the lowest UV index in Williamstown is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: The daily high UV index of 1 in December translates into this advice:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
How cold is December in Williamstown?
What is the most humid month in Williamstown?
What is the average humidity in December in Williamstown?
How much does it rain in Williamstown in December?
How much does it snow in Williamstown in December?
What is the month with the shortest days in Williamstown?
What is the average length of the day in December in Williamstown?
What time are sunrise and sunset in December in Williamstown?
How many hours of sunshine does Williamstown have in December?
What is the month with the lowest UV index in Williamstown?
What is the UV index reading in December in Williamstown?
Average temperature in December
Williamstown, IN
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34.7°F).
- Average low temperature in December: 29.3°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure in December
Williamstown, IN
- Average pressure in December: 30.12"Hg
The months with the highest atmospheric pressure are January and November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Williamstown, IN
- Average wind speed in December: 8.9mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).
Average humidity in December
Williamstown, IN
- Average humidity in December: 82%
The months with the highest relative humidity are January and December (82%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Williamstown, IN
- Average rainfall in December: 2.32"
The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in December
Williamstown, IN
- Average rainfall days in December: 10.7 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is February (8.4 days).
Average snowfall in December
Williamstown, IN
- Average snowfall in December: 1.77"
The month with the highest snowfall is February (2.64").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Williamstown, IN
- Average snowfall days in December: 7.8 days
The month with the highest number of snowfall days is January (9.8 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, IN
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 0min
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 54min).
Average sunshine days in December
Williamstown, IN
- Average sunshine days in December: 13.8 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is May (9.9 days).
Average UV index in December
Williamstown, IN
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Williamstown, IN
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Williamstown, IN
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Williamstown, Indiana, USA
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