ERA5 almanac comparison — 8 years of real data
Cartagena vs Huatulco: weather in December
Huatulco is the clear winner for sun in December: 68% of days historically clear versus just 26% in Cartagena — a 42-point gap across 8 years of ERA5 data. Cartagena also sees measurably more rain than Huatulco this month (26% vs 11% of days). This isn't close.
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.
Cartagena
CO
- Clear days, December
- 26%
- Sample size
- n=248 days
- Avg high
- 88°F
- Early December (1st–15th)
- 25%
- Late December (16th–end)
- 26%
- Rain frequency
- 26% of days
Huatulco
MX
- Clear days, December
- 68%
- Sample size
- n=248 days
- Avg high
- 86°F
- Early December (1st–15th)
- 67%
- Late December (16th–end)
- 68%
- Rain frequency
- 11% of days
Compare Cartagena vs Huatulco 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.