Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December's arrival coincides with a drop in the average high-temperature, decreasing from November's fresh 53.8°F (12.1°C) to a frosty 43.2°F (6.2°C). An average nighttime temperature of 29.8°F (-1.2°C) is recorded in Saint Clair during December.Humidity
In Saint Clair, the average relative humidity in December is 76%.Rainfall
In December, the rain falls for 6.3 days. Throughout December, 1.14" (29mm) of precipitation is accumulated. Throughout the year, there are 126.7 rainfall days, and 20.63" (524mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall in Saint Clair. In Saint Clair, in December, during 3.7 snowfall days, 0.83" (21mm) of snow is typically accumulated. In Saint Clair, during the entire year, snow falls for 19.3 days and aggregates up to 4.17" (106mm) 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 the month, sunrise is at 7:02 am and sunset at 4:43 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:53 pm CST.
Sunshine
The average sunshine in December in Saint Clair, Missouri, 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 reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The daily high UV index of 2 in December translates into this advice:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Frequently asked questions
How cold is it in Saint Clair in December?
What is the average humidity in December in Saint Clair?
How much does it rain in Saint Clair in December?
How much does it snow in Saint Clair in December?
What is the month with the shortest days in Saint Clair?
How many hours of daylight does Saint Clair have in December?
What time are sunrise and sunset in December in Saint Clair?
How many hours of sunshine does Saint Clair have in December?
When is the lowest UV index in Saint Clair?
How high is the UV index in December in Saint Clair?
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 3min
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 5min
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).
Saint Clair, Missouri, USA
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