December weather forecastVandalia, IN
December
Weather in December
The first month of the winter, December, is also an icy month in Vandalia, Indiana, with an average temperature fluctuating between 28.6°F (-1.9°C) and 40.1°F (4.5°C).Temperature
The onset of December introduces a moderate change in Vandalia's weather, with average high-temperatures falling from November's fresh 50.7°F (10.4°C) to a cold 40.1°F (4.5°C). Vandalia records an average low of 28.6°F (-1.9°C) throughout the nights in December.Humidity
In December, the average relative humidity is 81%.Rainfall
In December, the rain falls for 10.1 days. Throughout December, 2.2" (56mm) of precipitation is accumulated. Throughout the year, there are 154.9 rainfall days, and 26.18" (665mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Vandalia, in December, snow falls for 6.8 days, with typically accumulated 1.73" (44mm) of snow. Throughout the year, there are 30.1 snowfall days, and 7.83" (199mm) of snow is accumulated.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:48 am and sunset at 5:24 pm. On the last day of December, in Vandalia, sunrise is at 8:07 am and sunset at 5:34 pm EST.
Sunshine
January and December, with an average of 4.3h of sunshine, are months with the least sunshine.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: A typical high UV index of 2 in December suggests the following recommendations:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Vandalia, IN
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in December: 28.6°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in December
Vandalia, IN
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Vandalia, IN
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is February (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Vandalia, IN
- Average humidity in December: 81%
The months with the highest relative humidity are May and July (82%).
The month with the lowest relative humidity is October (74%).
Average rainfall in December
Vandalia, IN
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is April (3.11").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in December
Vandalia, IN
- Average rainfall days in December: 10.1 days
The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Vandalia, IN
- Average snowfall in December: 1.73"
The month with the highest snowfall is January (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Vandalia, IN
- Average snowfall days in December: 6.8 days
The month with the highest number of snowfall days is January (9.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Vandalia, IN
- Average daylight in December: 9h and 30min
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 30min).
- Average sunshine in December: 4h and 18min
The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The months with the least sunshine are January and December (Average sunshine: 4h and 18min).
Average sunshine days in December
Vandalia, IN
- Average sunshine days in December: 15.4 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (9.8 days).
Average UV index in December
Vandalia, IN
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
Vandalia, IN
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Vandalia, IN
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, September, October, November and December (6mi).
The months with the lowest visibility are May, July and August (5mi).
