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
The commencement of December indicates a shift in the average high-temperature, receding from November's frosty 43.3°F (6.3°C) to an icy 32.2°F (0.1°C). San Luis usually reports an average low-temperature of 11.8°F (-11.2°C) during the month of December.Humidity
In San Luis, Colorado, the average relative humidity in December is 75%.Rainfall
In San Luis, during December, the rain falls for 3.3 days and regularly aggregates up to 0.51" (13mm) of precipitation. Throughout the year, in San Luis, there are 72.2 rainfall days, and 8.82" (224mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. In San Luis, in December, during 9.7 snowfall days, 4.06" (103mm) of snow is typically accumulated. Throughout the year, in San Luis, there are 57.6 snowfall days, and 28.58" (726mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 42min of daylight.On the first day of December, sunrise is at 6:57 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:54 pm MST.
Sunshine
The average sunshine in December is 6.6h.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in San Luis. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.Note: The UV index of 2 during December leads to these advisories:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. To protect against the Sun's most potent rays, avoid direct exposure around midday. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
How cold is it in San Luis in December?
What is the average humidity in December in San Luis?
How much does it rain in San Luis in December?
How much does it snow in San Luis in December?
What is the month with the shortest days in San Luis?
How many hours of daylight does San Luis have in December?
What time are sunrise and sunset in December in San Luis?
How long on average sun shines in December in San Luis?
What is the month with the lowest UV index in San Luis?
How high is the UV index in December in San Luis?
Average temperature in December
San Luis, CO
- Average high temperature in December: 32.2°F
The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in December: 11.8°F
The month with the highest average low temperature is July (50.2°F).
The coldest month (with the lowest average low temperature) is January (9.3°F).
Average pressure in December
San Luis, CO
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is April (29.89"Hg).
Average wind speed in December
San Luis, CO
- Average wind speed in December: 6.4mph
The windiest months (with the highest average wind speed) are April and May (8.9mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).
Average humidity in December
San Luis, CO
- Average humidity in December: 75%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is June (38%).
Average rainfall in December
San Luis, CO
- Average rainfall in December: 0.51"
The wettest month (with the highest rainfall) is July (1.61").
The driest month (with the least rainfall) is November (0.43").
Average rainfall days in December
San Luis, CO
- Average rainfall days in December: 3.3 days
The month with the highest number of rainy days is July (13.9 days).
The month with the least rainy days is November (1.3 days).
Average snowfall in December
San Luis, CO
- Average snowfall in December: 4.06"
The month with the highest snowfall is March (5.55").
The months with the least snowfall are July and August (0").
Average snowfall days in December
San Luis, CO
- Average snowfall days in December: 9.7 days
The month with the highest number of snowfall days is February (10.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
San Luis, CO
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 6h and 4min
The month with the most sunshine is June (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 6h and 30min).
Average sunshine days in December
San Luis, CO
- Average sunshine days in December: 21.3 days
The month with the most sunshine days is October (24.1 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in December
San Luis, 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, March, October, November and December (UV index 2).
Average cloud cover in December
San Luis, CO
- Average cloud cover in December: 28
The month with the most cloud cover is January (Cloud cover 31).
The months with the least cloud cover are June and October (Cloud cover 14).
Average visibility in December
San Luis, CO
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
San Luis, Colorado, USA
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