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 marks a distinct drop in the average high-temperature, descending from November's chilly 43°F (6.1°C) to a subzero cold 27.5°F (-2.5°C). During December, Lyons records an average temperature of 15.4°F (-9.2°C) at night.Humidity
The average relative humidity in December is 85%.Rainfall
In Lyons, during December, the rain falls for 3.5 days and regularly aggregates up to 1.06" (27mm) of precipitation. In Lyons, during the entire year, the rain falls for 118.3 days and collects up to 22.76" (578mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Lyons, South Dakota. December is the month with the most snowfall in Lyons. Snow falls for 10.1 days and accumulates 4.21" (107mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 0min of daylight.On the first day of December, sunrise is at 7:41 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 8:01 am and sunset at 5:00 pm CST.
Sunshine
In December, the average sunshine is 4.3h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals.Note: In December, the maximum UV index of 1 translates into these guidelines:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Lyons in December?
What is the average humidity in December in Lyons?
How many days does it rain in December in Lyons?
When does it snow the most in Lyons?
How many days does it snow in December in Lyons?
What is the month with the shortest days in Lyons?
How many hours of daylight does Lyons have in December?
When is the sunrise / sunset in December in Lyons?
How long on average sun shines in December in Lyons?
What is the month with the lowest UV index in Lyons?
What is the UV index intensity in December in Lyons?
Average temperature in December
Lyons, SD
- Average high temperature in December: 27.5°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (22.8°F).
- Average low temperature in December: 15.4°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (9.3°F).
Average pressure in December
Lyons, SD
- Average pressure in December: 30.13"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Lyons, SD
- Average wind speed in December: 10.3mph
The windiest month (with the highest average wind speed) is April (11.4mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity in December
Lyons, SD
- Average humidity in December: 85%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (67%).
Average rainfall in December
Lyons, SD
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is June (3.62").
The driest month (with the least rainfall) is February (0.63").
Average rainfall days in December
Lyons, SD
- Average rainfall days in December: 3.5 days
The month with the highest number of rainy days is June (18.3 days).
The month with the least rainy days is February (2.6 days).
Average snowfall in December
Lyons, SD
- Average snowfall in December: 4.21"
The month with the highest snowfall is December (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Lyons, SD
- Average snowfall days in December: 10.1 days
The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Lyons, SD
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in December
Lyons, SD
- Average sunshine days in December: 20.2 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in December
Lyons, SD
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Lyons, SD
- Average cloud cover in December: 54
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in December
Lyons, SD
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Lyons, South Dakota, USA
Weather forecast for your location
2. Allow the app to use your location