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 onset of December in San Antonio entails a subtle temperature shift, as the average high-temperature eases from a pleasant 69.8°F (21°C) in November to an enjoyable 62.4°F (16.9°C). The average temperature during December nights in San Antonio is registered at a frosty 46.9°F (8.3°C).Humidity
The average relative humidity in December in San Antonio is 69%.Rainfall
In San Antonio, in December, during 9.9 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. Throughout the year, in San Antonio, there are 144.5 rainfall days, and 22.6" (574mm) of precipitation is accumulated.Snowfall
Months with snowfall in San Antonio 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. In San Antonio, during the entire year, snow falls for 0.7 days and aggregates up to 0.2" (5mm) of snow.Daylight
The month with the shortest days is December, with an average of 10h and 18min of daylight.On the first day of December in San Antonio, sunrise is at 7:11 am and sunset at 5:35 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 5:46 pm CST.
Sunshine
With an average of 5.3h of sunshine, December has the least sunshine of the year in San Antonio.UV index
The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily maximum UV index of 3 in December translates into the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Frequently asked questions
What is the temperature in December in San Antonio?
What is the average humidity in December in San Antonio?
How many days does it rain in December in San Antonio?
When does it start to snow in San Antonio?
What is the month with the shortest days in San Antonio?
How many hours of daylight does San Antonio have in December?
What time are sunrise and sunset in December in San Antonio?
What is the month with the least sunshine in San Antonio?
How many hours of sunshine does San Antonio have in December?
When is the lowest UV index in San Antonio?
What is the UV index intensity in December in San Antonio?
Average temperature in December
San Antonio, TX
- Average high temperature in December: 62.4°F
The warmest month (with the highest average high temperature) is August (96.6°F).
The month with the lowest average high temperature is January (61.7°F).
- Average low temperature in December: 46.9°F
The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).
Average pressure in December
San Antonio, 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 (29.89"Hg).
Average wind speed in December
San Antonio, TX
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is May (9mph).
The calmest month (with the lowest average wind speed) is September (6.5mph).
Average humidity in December
San Antonio, TX
- Average humidity in December: 69%
The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (59%).
Average rainfall in December
San Antonio, TX
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in December
San Antonio, TX
- Average rainfall days in December: 9.9 days
The month with the highest number of rainy days is September (17 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in December
San Antonio, TX
- Average snowfall in December: 0.04"
The months with the highest snowfall are January and February (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in December
San Antonio, 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 Antonio, 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 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in December
San Antonio, TX
- Average sunshine days in December: 19 days
The month with the most sunshine days is January (20.3 days).
The months with the least sunshine days are May and September (11.8 days).
Average UV index in December
San Antonio, 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 Antonio, TX
- Average cloud cover in December: 41
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in December
San Antonio, TX
- 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).
San Antonio, Texas, USA
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