December weather forecastWilliamsburg, IA
December
Weather in December
December, the first month of the winter in Williamsburg, is still a cold month, with an average temperature ranging between max 33.6°F (0.9°C) and min 22.6°F (-5.2°C).Temperature
The shift from November to December involves a decrease in the average high-temperature, dropping from a frosty 46.6°F (8.1°C) to an icy 33.6°F (0.9°C). Williamsburg's temperature lowers to a mean of 22.6°F (-5.2°C) during the nights in December.Humidity
In December, the average relative humidity in Williamsburg, Iowa, is 81%.Rainfall
In Williamsburg, in December, during 6.4 rainfall days, 1.42" (36mm) of precipitation is typically accumulated. In Williamsburg, during the entire year, the rain falls for 142 days and collects up to 29.09" (739mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In December, it is snowing for 6.7 days. Throughout December, 2.17" (55mm) of snow is accumulated. Throughout the year, in Williamsburg, there are 35.1 snowfall days, and 15.43" (392mm) of snow is accumulated.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:16 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:34 am and sunset at 4:47 pm CST.
Sunshine
In December, the average sunshine is 4.5h.UV index
The months with the lowest UV index in Williamsburg are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.Note: The maximum UV index, 1 during December, leads to the following recommendations:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Williamsburg, IA
- Average high temperature in December: 33.6°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27.1°F).
- Average low temperature in December: 22.6°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure in December
Williamsburg, IA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Williamsburg, IA
- Average wind speed in December: 10.1mph
The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in December
Williamsburg, IA
- Average humidity in December: 81%
The months with the highest relative humidity are January and July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Williamsburg, IA
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is May (4.33").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days in December
Williamsburg, IA
- Average rainfall days in December: 6.4 days
The months with the highest number of rainy days are May and June (18.5 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in December
Williamsburg, IA
- Average snowfall in December: 2.17"
The month with the highest snowfall is January (4.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Williamsburg, IA
- Average snowfall days in December: 6.7 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Williamsburg, IA
- Average daylight in December: 9h and 12min
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 12min).
- Average sunshine in December: 4h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Williamsburg, IA
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is June (9.1 days).
Average UV index in December
Williamsburg, IA
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Williamsburg, IA
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in December
Williamsburg, IA
- 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).
