December weather forecastMehlville, MO
December
Weather in December
And finally, December welcomes a full-fledged winter in Mehlville, with significantly low temperatures and a comeback of snowfall. The town experiences noticeably lesser daylight, and the chilly winds demand utmost warmth. Snowfall is the main form of precipitation, bringing a festive mood to the town, especially near the holiday season. As a striking fact, snowfall in December measures 1.89" (48mm), replacing the absence of heavy rainfall. The cold and snowy weather marks the culmination of the year, making way for the beginning of a new cycle.Temperature
The onset of December introduces a moderate change in Mehlville's weather, with average high-temperatures falling from November's fresh 53.8°F (12.1°C) to a chilly 43.2°F (6.2°C). Throughout December, the average low-temperature records at a freezing cold 30.7°F (-0.7°C).Humidity
In December, the average relative humidity in Mehlville is 76%.Rainfall
In December, the rain falls for 8.2 days. Throughout December, 2.2" (56mm) of precipitation is accumulated. In Mehlville, Missouri, during the entire year, the rain falls for 146.1 days and collects up to 32.36" (822mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In Mehlville, in December, snow falls for 3 days, with typically accumulated 1.89" (48mm) of snow. In Mehlville, during the entire year, snow falls for 15.3 days and aggregates up to 8.27" (210mm) 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 7:00 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:50 pm CST.
Sunshine
The average sunshine in December is 4.9h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 2 during December translates into the following guidance:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Stay sun-safe with clothing that is both closely woven and worn loosely. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mehlville, MO
- Average high temperature in December: 43.2°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in December: 30.7°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 (25°F).
Average pressure in December
Mehlville, 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
Mehlville, MO
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in December
Mehlville, 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
Mehlville, MO
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is May (3.94").
The driest months (with the least rainfall) are February and November (1.77").
Average rainfall days in December
Mehlville, MO
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is July (16.9 days).
The months with the least rainy days are January and February (6.8 days).
Average snowfall in December
Mehlville, MO
- Average snowfall in December: 1.89"
The month with the highest snowfall is February (2.6").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Mehlville, MO
- Average snowfall days in December: 3 days
The months with the highest number of snowfall days are January and February (4.8 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
Mehlville, 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 54min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in December
Mehlville, MO
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is January (20.9 days).
The month with the least sunshine days is June (11.6 days).
Average UV index in December
Mehlville, MO
- 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
Mehlville, MO
- Average cloud cover in December: 49
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Mehlville, 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).
