December weather forecastSullivan, MO
December
Weather in December
December, the first month of the winter in Sullivan, is still a chilly month, with an average temperature varying between 30°F (-1.1°C) and 43.2°F (6.2°C).Temperature
In the transition to December, Sullivan observes a drop in the average high-temperature, moving from a cool 53.6°F (12°C) in November to a chilly 43.2°F (6.2°C). Sullivan sees an average low-temperature of 30°F (-1.1°C) during December.Humidity
In December, the average relative humidity in Sullivan is 76%.Rainfall
In Sullivan, in December, during 8.1 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. In Sullivan, Missouri, during the entire year, the rain falls for 149.6 days and collects up to 32.05" (814mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Sullivan. In December, it is snowing for 4.2 days. Throughout December, 2.17" (55mm) of snow is accumulated. Throughout the year, there are 21.6 snowfall days, and 9.41" (239mm) of snow is accumulated.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year in Sullivan.On the first day of December, sunrise is at 7:03 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:54 pm CST.
Sunshine
In December, the average sunshine is 5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Sullivan. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sullivan, MO
- Average high temperature in December: 43.2°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (39°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (24.4°F).
Average pressure in December
Sullivan, 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
Sullivan, MO
- Average wind speed in December: 8.1mph
The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Sullivan, 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
Sullivan, MO
- Average rainfall in December: 2.24"
The wettest month (with the highest rainfall) is April (3.86").
The driest month (with the least rainfall) is November (1.85").
Average rainfall days in December
Sullivan, MO
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (7 days).
Average snowfall in December
Sullivan, MO
- Average snowfall in December: 2.17"
The month with the highest snowfall is January (2.68").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Sullivan, MO
- Average snowfall days in December: 4.2 days
The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sullivan, MO
- Average daylight in December: 9h and 36min
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 36min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in December
Sullivan, MO
- Average sunshine days in December: 19 days
The month with the most sunshine days is January (19.1 days).
The month with the least sunshine days is July (11.9 days).
Average UV index in December
Sullivan, 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
Sullivan, MO
- Average cloud cover in December: 47
The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are June and July (Cloud cover 29).
Average visibility in December
Sullivan, MO
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
