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
With December's onset, the average high-temperature recedes from November's fresh 53.6°F (12°C) to a wintry 41°F (5°C). Riley, in the month of December, anticipates a consistent average low-temperature of 26.4°F (-3.1°C).Humidity
In Riley, the average relative humidity in December is 71%.Rainfall
In Riley, Kansas, during December, the rain falls for 4.4 days and regularly aggregates up to 0.79" (20mm) of precipitation. Throughout the year, there are 114.8 rainfall days, and 21.1" (536mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In Riley, in December, snow falls for 3.2 days, with typically accumulated 0.94" (24mm) of snow. In Riley, during the entire year, snow falls for 17.5 days and aggregates up to 7.32" (186mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of December in Riley, Kansas, sunrise is at 7:28 am and sunset at 5:04 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:14 pm CST.
Sunshine
With an average of 5.7h of sunshine, December has the least sunshine of the year in Riley.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 estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: During December, 2 as the daily maximum UV index converts into the following advice:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Riley in December?
What is the average humidity in December in Riley?
How many days does it rain in December in Riley?
How many days does it snow in December in Riley?
What is the month with the shortest days in Riley?
What is the average length of the day in December in Riley?
When are sunrise and sunset in December in Riley?
What is the month with the least sunshine in Riley?
How long on average sun shines in December in Riley?
What is the month with the lowest UV index in Riley?
How high is the UV index in December in Riley?
Average temperature in December
Riley, KS
- Average high temperature in December: 41°F
The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in December: 26.4°F
The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (23°F).
Average pressure in December
Riley, KS
- 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 (29.85"Hg).
Average wind speed in December
Riley, KS
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is April (11.8mph).
The calmest month (with the lowest average wind speed) is August (8.6mph).
Average humidity in December
Riley, KS
- Average humidity in December: 71%
The month with the highest relative humidity is May (74%).
The month with the lowest relative humidity is October (64%).
Average rainfall in December
Riley, KS
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is May (3.98").
The driest month (with the least rainfall) is January (0.63").
Average rainfall days in December
Riley, KS
- Average rainfall days in December: 4.4 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is January (3.7 days).
Average snowfall in December
Riley, KS
- Average snowfall in December: 0.94"
The month with the highest snowfall is February (2.24").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Riley, KS
- Average snowfall days in December: 3.2 days
The month with the highest number of snowfall days is 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
Riley, KS
- 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 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in December
Riley, KS
- Average sunshine days in December: 23.3 days
The month with the most sunshine days is January (23.5 days).
The month with the least sunshine days is May (13.8 days).
Average UV index in December
Riley, KS
- Average UV index in December: 2
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Riley, KS
- Average cloud cover in December: 36
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is June (Cloud cover 22).
Average visibility in December
Riley, KS
- 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).
Riley, Kansas, USA
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