ERA5 almanac comparison — 8 years of real data
Houston vs San Diego: weather in November
Essentially a tie in November: Houston is 25% clear historically, San Diego is 28% clear (8-year ERA5 average) — within the noise. Avg high 72°F vs 70°F. Houston also sees measurably more rain than San Diego this month (38% vs 13% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Houston
TX
- Clear days, November
- 25%
- Sample size
- n=240 days
- Avg high
- 72°F
- Early November (1st–15th)
- 32%
- Late November (16th–end)
- 18%
- Rain frequency
- 38% of days
San Diego
CA
- Clear days, November
- 28%
- Sample size
- n=240 days
- Avg high
- 70°F
- Early November (1st–15th)
- 38%
- Late November (16th–end)
- 19%
- Rain frequency
- 13% of days
Compare Houston vs San Diego 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.