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
Onset of December witnesses a reduction in the average high-temperature, falling from a fresh 52.3°F (11.3°C) in November to a cold 40.3°F (4.6°C). Riverside's nighttime temperature during December is consistently averaged at a subzero cold 27.3°F (-2.6°C).Humidity
In Riverside, the average relative humidity in December is 74%.Rainfall
In Riverside, during December, the rain falls for 5.2 days and regularly aggregates up to 0.91" (23mm) of precipitation. Throughout the year, there are 126.5 rainfall days, and 21.65" (550mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Riverside, in December, snow falls for 3.2 days, with typically accumulated 0.67" (17mm) of snow. Throughout the year, in Riverside, there are 17.2 snowfall days, and 5.51" (140mm) of snow is accumulated.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 7:19 am and sunset at 4:56 pm. On the last day of December, sunrise is at 7:37 am and sunset at 5:05 pm CST.
Sunshine
The average sunshine in December is 5.3h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: In December, the maximum UV index of 2 suggests this advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Stay sun-safe with clothing that is both closely woven and worn loosely. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
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?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Riverside have in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Riverside have in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Riverside, MO
- Average high temperature in December: 40.3°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (36.5°F).
- Average low temperature in December: 27.3°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure in December
Riverside, MO
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Riverside, MO
- Average wind speed in December: 9.1mph
The windiest months (with the highest average wind speed) are February, March and April (9.8mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in December
Riverside, MO
- Average humidity in December: 74%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (69%).
Average rainfall in December
Riverside, MO
- Average rainfall in December: 0.91"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in December
Riverside, MO
- Average rainfall days in December: 5.2 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in December
Riverside, MO
- Average snowfall in December: 0.67"
The month with the highest snowfall is February (2.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Riverside, MO
- Average snowfall days in December: 3.2 days
The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Riverside, MO
- Average daylight in December: 9h and 3min
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 30min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in December
Riverside, MO
- Average sunshine days in December: 22.1 days
The month with the most sunshine days is December (22.1 days).
The month with the least sunshine days is May (11.6 days).
Average UV index in December
Riverside, 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
Riverside, MO
- Average cloud cover in December: 42
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in December
Riverside, 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).
Riverside, Missouri, USA
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