ERA5 almanac comparison — 8 years of real data
Mexico City vs Tucson: weather in December
Mexico City edges out Tucson for sun in December: 50% clear historically versus 27% (8-year ERA5 average, a 23-point gap). Both are viable — Mexico City is the safer bet.
Mexico City
Mexico
- Clear days, December
- 50%
- Sample size
- n=248 days
- Avg high
- 72°F
- Early December (1st–15th)
- 60%
- Late December (16th–end)
- 40%
- Rain frequency
- 6% of days
Tucson
AZ
- Clear days, December
- 27%
- Sample size
- n=248 days
- Avg high
- 67°F
- Early December (1st–15th)
- 25%
- Late December (16th–end)
- 28%
- Rain frequency
- 13% of days
Frequently asked
Is Mexico City or Tucson warmer in December?
Mexico City runs warmer by day in December. Mexico City averages highs of 72°F (highs n=248 days); Tucson averages highs of 67°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Mexico City or Tucson in December?
Days with measurable rain: Mexico City 6%, Tucson 13% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in December, Mexico City or Tucson?
Mexico City edges out Tucson for sun in December: 50% clear historically versus 27% (8-year ERA5 average, a 23-point gap). Both are viable — Mexico City is the safer bet.
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.