December weather forecastLily, SD
December
Weather in December
December, the first month of the winter in Lily, is also a subzero cold month, with temperature in the range of an average low of 11.5°F (-11.4°C) and an average high of 23.2°F (-4.9°C).Temperature
The onset of December brings a distinct decrease in the average high-temperature, receding from a wintry 38.8°F (3.8°C) in November to a freezing cold 23.2°F (-4.9°C). Lily experiences a mean temperature of 11.5°F (-11.4°C) during December nights.Humidity
In December, the average relative humidity in Lily, South Dakota, is 88%.Rainfall
In Lily, during December, the rain falls for 4.1 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Lily, during the entire year, the rain falls for 112.9 days and collects up to 22.09" (561mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. December is the month with the most snowfall in Lily, South Dakota. Snow falls for 14.6 days and accumulates 4.53" (115mm) of snow.Daylight
December has the shortest days of the year in Lily, South Dakota, with an average of 8h and 48min of daylight.On the first day of the month, sunrise is at 7:50 am and sunset at 4:49 pm. On the last day of December, sunrise is at 8:09 am and sunset at 4:58 pm CST.
Sunshine
In December, the average sunshine is 3.6h.UV index
The months with the lowest UV index in Lily are January, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: During December, 1 as the daily maximum UV index converts into the following advice:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Experience reduced UV exposure by about half when donning a wide-brim hat. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lily, SD
- Average high temperature in December: 23.2°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (18.9°F).
- Average low temperature in December: 11.5°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (5°F).
Average pressure in December
Lily, SD
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Lily, SD
- Average wind speed in December: 11mph
The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is July (8.7mph).
Average humidity in December
Lily, SD
- Average humidity in December: 88%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is September (66%).
Average rainfall in December
Lily, SD
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is July (3.58").
The driest month (with the least rainfall) is November (0.63").
Average rainfall days in December
Lily, SD
- Average rainfall days in December: 4.1 days
The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in December
Lily, SD
- Average snowfall in December: 4.53"
The month with the highest snowfall is December (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Lily, SD
- Average snowfall days in December: 14.6 days
The month with the highest number of snowfall days is January (15.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Lily, SD
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 3h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in December
Lily, SD
- Average sunshine days in December: 15.2 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in December
Lily, 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, November and December (UV index 1).
Average cloud cover in December
Lily, SD
- Average cloud cover in December: 62
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in December
Lily, SD
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
