ERA5 almanac comparison — 8 years of real data
Cartagena vs Mérida: weather in May
Mérida is the clear winner for sun in May: 47% of days historically clear versus just 5% in Cartagena — a 42-point gap across 8 years of ERA5 data. Cartagena also sees measurably more rain than Mérida this month (72% vs 19% 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 May. For this
week’s actual forecast, each destination links to its live page below.
Cartagena
CO
- Clear days, May
- 5%
- Sample size
- n=248 days
- Avg high
- 87°F
- Early May (1st–15th)
- 8%
- Late May (16th–end)
- 2%
- Rain frequency
- 72% of days
Mérida
MX
- Clear days, May
- 47%
- Sample size
- n=248 days
- Avg high
- 97°F
- Early May (1st–15th)
- 62%
- Late May (16th–end)
- 33%
- Rain frequency
- 19% of days
Compare Cartagena vs Mérida 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.