ERA5 almanac comparison — 8 years of real data
Miami vs San Antonio: weather in December
Miami edges out San Antonio for sun in December: 28% clear historically versus 17% (8-year ERA5 average, a 11-point gap). Miami also sees measurably more rain than San Antonio this month (41% vs 21% of days). Both are viable — Miami is the safer bet.
Miami
FL
- Clear days, December
- 28%
- Sample size
- n=248 days
- Avg high
- 77°F
- Early December (1st–15th)
- 35%
- Late December (16th–end)
- 21%
- Rain frequency
- 41% of days
San Antonio
TX
- Clear days, December
- 17%
- Sample size
- n=248 days
- Avg high
- 68°F
- Early December (1st–15th)
- 20%
- Late December (16th–end)
- 14%
- Rain frequency
- 21% of days
Frequently asked
Is Miami or San Antonio warmer in December?
Miami runs warmer by day in December. Miami averages highs of 77°F (highs n=248 days); San Antonio averages highs of 68°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Miami or San Antonio in December?
Miami is measurably wetter than San Antonio. Days with measurable rain: Miami 41%, San Antonio 21% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in December, Miami or San Antonio?
Miami edges out San Antonio for sun in December: 28% clear historically versus 17% (8-year ERA5 average, a 11-point gap). Miami also sees measurably more rain than San Antonio this month (41% vs 21% of days). Both are viable — Miami is the safer bet.
Compare Miami vs San Antonio in another month
All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.