ERA5 almanac comparison — 8 years of real data
Mexico City vs Tucson: weather in January
Mexico City is the clear winner for sun in January: 52% of days historically clear versus just 13% in Tucson — a 39-point gap across 8 years of ERA5 data. This isn't close.
Mexico City
Mexico
- 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
Tucson
AZ
- Clear days, January
- 13%
- Sample size
- n=248 days
- Avg high
- 65°F
- Early January (1st–15th)
- 12%
- Late January (16th–end)
- 13%
- Rain frequency
- 14% of days
Frequently asked
Is Mexico City or Tucson warmer in January?
Mexico City runs warmer by day in January. Mexico City averages highs of 73°F (highs n=248 days); Tucson averages highs of 65°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Mexico City or Tucson in January?
Days with measurable rain: Mexico City 8%, Tucson 14% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in January, Mexico City or Tucson?
Mexico City is the clear winner for sun in January: 52% of days historically clear versus just 13% in Tucson — a 39-point gap across 8 years of ERA5 data. 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.