ERA5 almanac comparison — 8 years of real data
New Orleans vs Tulum: weather in December
Tulum edges out New Orleans for sun in December: 21% clear historically versus 6% (8-year ERA5 average, a 15-point gap). Both are viable — Tulum is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific December. For this
week’s actual forecast, each destination links to its live page below.
New Orleans
LA
- Clear days, December
- 6%
- Sample size
- n=248 days
- Avg high
- 65°F
- Early December (1st–15th)
- 7%
- Late December (16th–end)
- 6%
- Rain frequency
- 37% of days
Tulum
MX
- Clear days, December
- 21%
- Sample size
- n=248 days
- Avg high
- 81°F
- Early December (1st–15th)
- 21%
- Late December (16th–end)
- 21%
- Rain frequency
- 49% of days
Compare New Orleans vs Tulum 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.