ERA5 almanac comparison — 8 years of real data
Houston vs Mérida: weather in January
Mérida is the clear winner for sun in January: 55% of days historically clear versus just 2% in Houston — a 53-point gap across 8 years of ERA5 data. Houston also sees measurably more rain than Mérida this month (38% vs 20% 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 January. For this
week’s actual forecast, each destination links to its live page below.
Houston
TX
- Clear days, January
- 2%
- Sample size
- n=248 days
- Avg high
- 62°F
- Early January (1st–15th)
- 4%
- Late January (16th–end)
- 0%
- Rain frequency
- 38% of days
Mérida
MX
- Clear days, January
- 55%
- Sample size
- n=248 days
- Avg high
- 83°F
- Early January (1st–15th)
- 56%
- Late January (16th–end)
- 54%
- Rain frequency
- 20% of days
Compare Houston 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.