December weather in San Antonio, United States
Averages from 155 days in December across 2020–2024.
Typical conditions
| Average high | 20.2°C |
|---|---|
| Average low | 9.6°C |
| Average mean | 14.6°C |
| Total precipitation | 245.8 mm |
| Rainy days | 75 |
| Average precipitation hours | 3 h |
| Average max wind speed | 17.7 km/h |
| Average sunshine | 7 h/day |
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