ERA5 almanac comparison — 8 years of real data
Exuma vs Mexico City: weather in December
Mexico City edges out Exuma for sun in December: 50% clear historically versus 37% (8-year ERA5 average, a 13-point gap). Exuma also sees measurably more rain than Mexico City this month (35% vs 6% of days). Both are viable — Mexico City is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific December. For this
week’s actual forecast, each destination links to its live page below.
Exuma
BS
- Clear days, December
- 37%
- Sample size
- n=248 days
- Avg high
- 78°F
- Early December (1st–15th)
- 40%
- Late December (16th–end)
- 34%
- Rain frequency
- 35% of days
Mexico City
MX
- Clear days, December
- 50%
- Sample size
- n=248 days
- Avg high
- 72°F
- Early December (1st–15th)
- 60%
- Late December (16th–end)
- 40%
- Rain frequency
- 6% of days
Compare Exuma vs Mexico City 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 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.