ERA5 almanac comparison — 8 years of real data
Charleston vs Houston: weather in March
Essentially a tie in March: Charleston is 12% clear historically, Houston is 15% clear (8-year ERA5 average) — within the noise. Avg high 68°F vs 74°F. Houston also sees measurably more rain than Charleston this month (46% vs 29% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Charleston
SC
- Clear days, March
- 12%
- Sample size
- n=248 days
- Avg high
- 68°F
- Early March (1st–15th)
- 8%
- Late March (16th–end)
- 16%
- Rain frequency
- 29% of days
Houston
TX
- Clear days, March
- 15%
- Sample size
- n=248 days
- Avg high
- 74°F
- Early March (1st–15th)
- 8%
- Late March (16th–end)
- 22%
- Rain frequency
- 46% of days
Frequently asked
Is Charleston or Houston warmer in March?
Houston runs warmer by day in March. Charleston averages highs of 68°F (highs n=248 days); Houston averages highs of 74°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Charleston or Houston in March?
Houston is measurably wetter than Charleston. Days with measurable rain: Charleston 29%, Houston 46% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in March, Charleston or Houston?
Essentially a tie in March: Charleston is 12% clear historically, Houston is 15% clear (8-year ERA5 average) — within the noise. Avg high 68°F vs 74°F. Houston also sees measurably more rain than Charleston this month (46% vs 29% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Compare Charleston vs Houston 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.