December weather forecastSaint Clair, MO
December
Weather in December
The first month of the winter, December, is still a chilly month in Saint Clair, Missouri, with an average temperature fluctuating between 29.8°F (-1.2°C) and 43.2°F (6.2°C).Temperature
In December, the average high-temperature decreases from a cool 53.8°F (12.1°C) in November to a chilly 43.2°F (6.2°C). Saint Clair sees an average low-temperature of 29.8°F (-1.2°C) during December.Humidity
In December, the average relative humidity is 76%.Rainfall
In December, in Saint Clair, Missouri, the rain falls for 6.3 days. Throughout December, 1.14" (29mm) of precipitation is accumulated. In Saint Clair, Missouri, during the entire year, the rain falls for 126.7 days and collects up to 20.63" (524mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Saint Clair, in December, during 3.7 snowfall days, 0.83" (21mm) of snow is typically accumulated. Throughout the year, there are 19.3 snowfall days, and 4.17" (106mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 7:02 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:53 pm CST.
Sunshine
In Saint Clair, Missouri, the average sunshine in December is 4.9h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 2 in December translates into these instructions:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint Clair, MO
- Average high temperature in December: 43.2°F
The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in December: 29.8°F
The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in December
Saint Clair, 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
Saint Clair, MO
- Average wind speed in December: 8mph
The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in December
Saint Clair, 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 (72%).
Average rainfall in December
Saint Clair, MO
- Average rainfall in December: 1.14"
The wettest months (with the highest rainfall) are April and May (2.48").
The driest months (with the least rainfall) are January and February (0.98").
Average rainfall days in December
Saint Clair, MO
- Average rainfall days in December: 6.3 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in December
Saint Clair, MO
- Average snowfall in December: 0.83"
The month with the highest snowfall is February (1.57").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Saint Clair, MO
- Average snowfall days in December: 3.7 days
The month with the highest number of snowfall days is January (6.2 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Saint Clair, 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 months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 42min).
Average sunshine days in December
Saint Clair, MO
- Average sunshine days in December: 20.5 days
The month with the most sunshine days is January (20.6 days).
The month with the least sunshine days is May (13.7 days).
Average UV index in December
Saint Clair, 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, November and December (UV index 2).
Average cloud cover in December
Saint Clair, MO
- Average cloud cover in December: 48
The months with the most cloud cover are January and February (Cloud cover 49).
The months with the least cloud cover are June and July (Cloud cover 29).
Average visibility in December
Saint Clair, MO
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, October, November and December (6mi).
The months with the lowest visibility are May, August and September (5mi).
