Climate in Arnold
Arnold shares St. Louis's humid, four-season climate, plus a real, distinctive river-flood history at the Meramec/Mississippi confluence that the city has substantially, successfully mitigated.
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Learn moreA humid, four-season St. Louis-metro climate
Arnold shares the same warm-to-hot, humid summers and cold winters documented across the St. Louis metro and this dataset's other Missouri Tier B markets.
A real, largely mitigated river-flood history
Arnold's 1993 flood damaged more than 225 properties ($1.6 million in damage). A real ~500-home federal buyout program (1994-2005) converted the most flood-prone areas into parkland, and the 2008 flood caused just $12,000 in damage as a direct result -- a genuine, disclosed mitigation success.
Missouri's real, elevated tornado risk
Missouri recorded 120 tornadoes in 2025, the 3rd-most of any state, including the real, destructive May 16, 2025 EF3 tornado that struck the St. Louis area -- Arnold sits within this broader regional exposure zone.
Confirm flood-zone status for specific addresses
River-flood risk remains a real, relevant factor for any specific address near the Meramec that was not part of the buyout program -- confirm current, address-specific FEMA flood-zone status directly.
Key takeaways
- Arnold shares the St. Louis metro's humid, four-season climate.
- A real, substantially mitigated flood history exists via the city's ~500-home buyout program.
- Missouri's real, elevated tornado risk applies to Arnold as a St. Louis-metro-adjacent suburb.
- Confirm current, address-specific FEMA flood-zone status directly for any target property.
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