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
The onset of December introduces a moderate change in Sumner's weather, with average high-temperatures falling from November's fresh 50.9°F (10.5°C) to a cold 38.7°F (3.7°C). Throughout December, Sumner records an average temperature of 26.1°F (-3.3°C) at night.Humidity
In December, the average relative humidity is 78%.Rainfall
The month with the least rainfall is December, when the rain falls for 4.5 days and typically collects 0.43" (11mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In Sumner, in December, snow falls for 4.1 days, with typically accumulated 0.35" (9mm) of snow. In Sumner, during the entire year, snow falls for 20.6 days and aggregates up to 2.99" (76mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:15 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 4:58 pm CST.
Sunshine
The average sunshine in December 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 Sumner. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Experience reduced UV exposure by about half when donning a wide-brim hat. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
What is the driest month?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How many hours of sunshine does Sumner have in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Sumner, MO
- Average high temperature in December: 38.7°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (33.6°F).
- Average low temperature in December: 26.1°F
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in December
Sumner, 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 (29.9"Hg).
Average wind speed in December
Sumner, MO
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is March (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in December
Sumner, MO
- Average humidity in December: 78%
The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Sumner, MO
- Average rainfall in December: 0.43"
The wettest months (with the highest rainfall) are May and June (1.46").
The driest month (with the least rainfall) is December (0.43").
Average rainfall days in December
Sumner, MO
- Average rainfall days in December: 4.5 days
The month with the highest number of rainy days is May (12.3 days).
The month with the least rainy days is January (4.2 days).
Average snowfall in December
Sumner, MO
- Average snowfall in December: 0.35"
The month with the highest snowfall is January (1.02").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Sumner, MO
- Average snowfall days in December: 4.1 days
The month with the highest number of snowfall days is January (6.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sumner, MO
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
Sumner, MO
- Average sunshine days in December: 23.5 days
The month with the most sunshine days is December (23.5 days).
The month with the least sunshine days is May (13.8 days).
Average UV index in December
Sumner, MO
- Average UV index in December: 2
The months with the highest UV index are 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
Sumner, MO
- Average cloud cover in December: 45
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in December
Sumner, 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).
Sumner, Missouri, USA
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