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 onset in Affton corresponds with a shift in the average high-temperature, moving from a fresh 53.8°F (12.1°C) in November to a frosty 43.2°F (6.2°C). During the December nights, an average temperature of 30.7°F (-0.7°C) is observed in Affton.Humidity
In Affton, Missouri, the average relative humidity in December is 76%.Rainfall
In December, the rain falls for 8.2 days. Throughout December, 2.2" (56mm) of precipitation is accumulated. Throughout the year, in Affton, there are 146.1 rainfall days, and 32.36" (822mm) of precipitation is accumulated.Snowfall
Months with snowfall in Affton, Missouri, are January through March, November and December. In Affton, Missouri, during December, snow falls for 3 days and regularly aggregates up to 1.89" (48mm) of snow. In Affton, during the entire year, snow falls for 15.3 days and aggregates up to 8.27" (210mm) of snow.Daylight
The month with the shortest days in Affton is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:50 pm CST.
Sunshine
In Affton, 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 estimate of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Frequently asked questions
How cold does it get in Affton in December?
What is the average humidity in December in Affton?
How many days does it rain in December in Affton?
How much does it snow in Affton in December?
What is the month with the shortest days in Affton?
What is the average length of the day in December in Affton?
When is the sunrise / sunset in December in Affton?
How long on average sun shines in December in Affton?
What is the month with the lowest UV index in Affton?
What is the UV index intensity in December in Affton?
Average temperature in December
Affton, 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
Affton, 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
Affton, 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
Affton, 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
Affton, 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
Affton, 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
Affton, 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
Affton, 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
Affton, 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 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
Affton, 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
Affton, 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
Affton, 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
Affton, 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).
Affton, Missouri, USA
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