ERA5 almanac comparison — 8 years of real data
Cancún vs St. Augustine: weather in December
Cancún edges out St. Augustine for sun in December: 20% clear historically versus 13% (8-year ERA5 average, a 7-point gap). Cancún also sees measurably more rain than St. Augustine this month (47% vs 25% of days). Both are viable — Cancún is the safer bet.
Cancún
Mexico
- Clear days, December
- 20%
- Sample size
- n=248 days
- Avg high
- 80°F
- Early December (1st–15th)
- 22%
- Late December (16th–end)
- 18%
- Rain frequency
- 47% of days
St. Augustine
FL
- Clear days, December
- 13%
- Sample size
- n=248 days
- Avg high
- 67°F
- Early December (1st–15th)
- 13%
- Late December (16th–end)
- 13%
- Rain frequency
- 25% of days
Frequently asked
Is Cancún or St. Augustine warmer in December?
Cancún runs warmer by day in December. Cancún averages highs of 80°F (highs n=248 days); St. Augustine averages highs of 67°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Cancún or St. Augustine in December?
Cancún is measurably wetter than St. Augustine. Days with measurable rain: Cancún 47%, St. Augustine 25% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in December, Cancún or St. Augustine?
Cancún edges out St. Augustine for sun in December: 20% clear historically versus 13% (8-year ERA5 average, a 7-point gap). Cancún also sees measurably more rain than St. Augustine this month (47% vs 25% of days). Both are viable — Cancún is the safer bet.
Compare Cancún vs St. Augustine 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.