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
In December, the average high-temperature marginally decreases from an agreeable 68.2°F (20.1°C) in November to a moderate 60.4°F (15.8°C). In December, San Marcos experiences an average nighttime temperature of 45.5°F (7.5°C).Humidity
In December, the average relative humidity in San Marcos is 72%.Rainfall
In December, in San Marcos, the rain falls for 11.7 days. Throughout December, 1.57" (40mm) of precipitation is accumulated. In San Marcos, during the entire year, the rain falls for 151.8 days and collects up to 26.89" (683mm) of precipitation.Snowfall
Months with snowfall in San Marcos are January, February and December. December is the first month it typically snows. Throughout December, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 0.7 snowfall days, and 0.28" (7mm) of snow is accumulated.Daylight
The month with the shortest days in San Marcos is December, with an average of 10h and 18min of daylight.On the first day of December in San Marcos, sunrise is at 7:10 am and sunset at 5:31 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 5:43 pm CST.
Sunshine
December has the least sunshine of the year in San Marcos, Texas, with an average of 5.2h of sunshine.UV index
With an average maximum UV index of 3, December is the month with the lowest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index, 3 in December, converts into the following recommendations:
Undertake protective steps - Recommendations to avoid sunburn are issued. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What is the temperature in December in San Marcos?
What is the average humidity in December in San Marcos?
How much does it rain in San Marcos in December?
When does it start to snow in San Marcos?
What is the month with the shortest days in San Marcos?
What is the average length of the day in December in San Marcos?
When is the sunrise / sunset in December in San Marcos?
What is the month with the least sunshine in San Marcos?
How long on average sun shines in December in San Marcos?
What is the month with the lowest UV index in San Marcos?
What is the UV index intensity in December in San Marcos?
Average temperature in December
San Marcos, TX
- Average high temperature in December: 60.4°F
The warmest month (with the highest average high temperature) is August (95.9°F).
The month with the lowest average high temperature is January (59.9°F).
- Average low temperature in December: 45.5°F
The month with the highest average low temperature is August (74.7°F).
The coldest month (with the lowest average low temperature) is January (42.8°F).
Average pressure in December
San Marcos, TX
- 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 June (29.9"Hg).
Average wind speed in December
San Marcos, TX
- Average wind speed in December: 8.1mph
The windiest month (with the highest average wind speed) is February (9.1mph).
The calmest month (with the lowest average wind speed) is September (6.1mph).
Average humidity in December
San Marcos, TX
- Average humidity in December: 72%
The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is August (62%).
Average rainfall in December
San Marcos, TX
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is February (1.1").
Average rainfall days in December
San Marcos, TX
- Average rainfall days in December: 11.7 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is January (9.4 days).
Average snowfall in December
San Marcos, TX
- Average snowfall in December: 0.04"
The months with the highest snowfall are January and February (0.12").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in December
San Marcos, TX
- Average snowfall days in December: 0.1 days
The months with the highest number of snowfall days are January and February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
San Marcos, TX
- Average daylight in December: 10h and 2min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in December: 5h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in December
San Marcos, TX
- Average sunshine days in December: 17.1 days
The month with the most sunshine days is January (19.4 days).
The month with the least sunshine days is May (11.9 days).
Average UV index in December
San Marcos, TX
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
San Marcos, TX
- Average cloud cover in December: 43
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in December
San Marcos, TX
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
San Marcos, Texas, USA
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