ERA5 almanac comparison — 8 years of real data
Mexico City vs Tucson: weather in October
Tucson is the clear winner for sun in October: 82% of days historically clear versus just 20% in Mexico City — a 62-point gap across 8 years of ERA5 data. Mexico City also sees measurably more rain than Tucson this month (50% vs 9% of days). This isn't close.
Mexico City
Mexico
- Clear days, October
- 20%
- Sample size
- n=248 days
- Avg high
- 74°F
- Early October (1st–15th)
- 10%
- Late October (16th–end)
- 29%
- Rain frequency
- 50% of days
Tucson
AZ
- Clear days, October
- 82%
- Sample size
- n=248 days
- Avg high
- 86°F
- Early October (1st–15th)
- 78%
- Late October (16th–end)
- 85%
- Rain frequency
- 9% of days
Frequently asked
Is Mexico City or Tucson warmer in October?
Tucson runs warmer by day in October. Mexico City averages highs of 74°F (highs n=248 days); Tucson averages highs of 86°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Mexico City or Tucson in October?
Mexico City is measurably wetter than Tucson. Days with measurable rain: Mexico City 50%, Tucson 9% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in October, Mexico City or Tucson?
Tucson is the clear winner for sun in October: 82% of days historically clear versus just 20% in Mexico City — a 62-point gap across 8 years of ERA5 data. Mexico City also sees measurably more rain than Tucson this month (50% vs 9% of days). This isn't close.
Compare Mexico City vs Tucson 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 forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.