December weather forecastLyons, CO
December
Weather in December
The first month of the winter, December, is also an icy month in Lyons, Colorado, with an average temperature ranging between max 35.4°F (1.9°C) and min 17.6°F (-8°C).Temperature
Lyons reaches its lowest average temperatures in December, measuring 35.4°F (1.9°C) at the peak and 17.6°F (-8°C) at the lowest.Humidity
The average relative humidity in December is 66%.Rainfall
In Lyons, in December, it is raining for 5.1 days, with typically 0.59" (15mm) of accumulated precipitation. Throughout the year, there are 134.2 rainfall days, and 17.13" (435mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In December, it is snowing for 9.4 days. Throughout December, 4.37" (111mm) of snow is accumulated. In Lyons, during the entire year, snow falls for 53.5 days and aggregates up to 42.36" (1076mm) 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 7:05 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:45 pm MST.
Sunshine
In December, the average sunshine is 6.8h.UV index
January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: During December, 2 as the daily maximum UV index converts into the following advice:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lyons, CO
- Average high temperature in December: 35.4°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is December (35.4°F).
- Average low temperature in December: 17.6°F
The month with the highest average low temperature is July (54.5°F).
The coldest month (with the lowest average low temperature) is December (17.6°F).
Average pressure in December
Lyons, CO
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are April and June (29.91"Hg).
Average wind speed in December
Lyons, CO
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is January (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in December
Lyons, CO
- Average humidity in December: 66%
The month with the highest relative humidity is February (71%).
The months with the lowest relative humidity are June, August and September (46%).
Average rainfall in December
Lyons, CO
- Average rainfall in December: 0.59"
The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in December
Lyons, CO
- Average rainfall days in December: 5.1 days
The month with the highest number of rainy days is July (20.4 days).
The month with the least rainy days is November (3.6 days).
Average snowfall in December
Lyons, CO
- Average snowfall in December: 4.37"
The month with the highest snowfall is April (8.39").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Lyons, CO
- Average snowfall days in December: 9.4 days
The month with the highest number of snowfall days is February (11 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Lyons, CO
- Average daylight in December: 9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 6h and 48min
The months with the most sunshine are June and July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).
Average sunshine days in December
Lyons, CO
- Average sunshine days in December: 19.4 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is July (7.3 days).
Average UV index in December
Lyons, CO
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in December
Lyons, CO
- Average cloud cover in December: 24
The months with the most cloud cover are April and May (Cloud cover 28).
The months with the least cloud cover are June and September (Cloud cover 17).
Average visibility in December
Lyons, CO
- 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).
