December weather forecastBallwin, MO
December
Weather in December
Concluding the year, December in Ballwin is hallmarked by the cold winter weather, ranging in temperatures from 30.2°F (-1°C) to 43.3°F (6.3°C). The landscapes become dormant and white with snow, coating the city in a winter wonderland aesthetic. As the daylight hours continue to shorten, indoor activities and holiday gatherings become a fix. Despite the chilly temperatures, the season has a certain magical allure punctuated by festive celebrations.Temperature
December's onset in Ballwin brings a reduction in the average high-temperature, from a cool 53.8°F (12.1°C) in November to a frosty 43.3°F (6.3°C). During the month of December, the temperature generally drops to a low average of 30.2°F (-1°C).Humidity
In December, the average relative humidity in Ballwin is 76%.Rainfall
In Ballwin, in December, it is raining for 6.1 days, with typically 1.42" (36mm) of accumulated precipitation. In Ballwin, during the entire year, the rain falls for 134.1 days and collects up to 23.82" (605mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. December is the month with the most snowfall. Snow falls for 4.1 days and accumulates 1.3" (33mm) of snow.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:01 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:51 pm CST.
Sunshine
In Ballwin, the average sunshine in December is 4.8h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Ballwin. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Opt for tightly woven and loose clothing to enhance protection from the Sun. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Ballwin, MO
- Average high temperature in December: 43.3°F
The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (38.5°F).
- Average low temperature in December: 30.2°F
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).
Average pressure in December
Ballwin, MO
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Ballwin, MO
- Average wind speed in December: 8.1mph
The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in December
Ballwin, MO
- Average humidity in December: 76%
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (71%).
Average rainfall in December
Ballwin, MO
- Average rainfall in December: 1.42"
The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is February (1.1").
Average rainfall days in December
Ballwin, MO
- Average rainfall days in December: 6.1 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is December (6.1 days).
Average snowfall in December
Ballwin, MO
- Average snowfall in December: 1.3"
The month with the highest snowfall is December (1.3").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Ballwin, MO
- Average snowfall days in December: 4.1 days
The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Ballwin, MO
- Average daylight in December: 9h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 4h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
Ballwin, MO
- Average sunshine days in December: 20.3 days
The month with the most sunshine days is December (20.3 days).
The month with the least sunshine days is May (12.6 days).
Average UV index in December
Ballwin, MO
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
Ballwin, MO
- Average cloud cover in December: 48
The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are June, July and August (Cloud cover 29).
Average visibility in December
Ballwin, MO
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
