ERA5 almanac comparison — 8 years of real data
Mexico City vs Naples: weather in January
Mexico City edges out Naples for sun in January: 52% clear historically versus 35% (8-year ERA5 average, a 17-point gap). Naples also sees measurably more rain than Mexico City this month (25% vs 8% 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 January. For this
week’s actual forecast, each destination links to its live page below.
Mexico City
MX
- Clear days, January
- 52%
- Sample size
- n=248 days
- Avg high
- 73°F
- Early January (1st–15th)
- 47%
- Late January (16th–end)
- 56%
- Rain frequency
- 8% of days
Naples
FL
- Clear days, January
- 35%
- Sample size
- n=248 days
- Avg high
- 73°F
- Early January (1st–15th)
- 32%
- Late January (16th–end)
- 37%
- Rain frequency
- 25% of days
Compare Mexico City vs Naples 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.