The 2026 51-State Windshield Hazard Index

What the index found

1. The hazard belt runs Oklahoma–Missouri–Kansas into Appalachia. The top of the table is dominated by states where three exposures stack: real hail frequency, winters that cross freezing repeatedly rather than staying frozen, and car-dependent commutes. Oklahoma (#3), Virginia (#4), Missouri (#5), Kansas (#6), Tennessee (#7), Illinois (#8), and Texas (#9) form the core belt, with Kentucky (#11) just behind.

2. Freeze-thaw beats deep freeze. Michigan (#46), Vermont (#47), and Maine (#48) rank surprisingly low: their winters are cold enough to stay frozen, which cycles glass less than the mid-South pattern of hard-freeze nights and above-freezing afternoons that pumps a chip open daily. The cycling band — mean winter lows in the 20s°F — is where cracks run.

3. Hail is the single biggest separator. At 30% weight, SPC severe-hail density drives the top tier: Oklahoma logs the nation’s highest 1-inch-plus hail-report density per land area, with Kansas, Texas, and Missouri close behind — consistent with two decades of insurance-industry loss experience.

4. Florida’s glass fame is legal, not meteorological. Ranking 49th on physical hazard, Florida’s outsized windshield-replacement economy traces to §627.7288 — its zero-deductible windshield law — a reminder that policy can shape a market more than weather.

5. The District of Columbia (#1) is an honest artifact worth explaining. DC tops the table on the nation’s longest commute exposure and mid-Atlantic freeze-thaw, amplified by per-area hail normalization over just 61 square miles — treat it as a dense-corridor signal (shared with #2 Maryland and #4 Virginia) rather than a hailstorm capital. It is flagged in the data.

The full ranking

* flagged approximation — see methodology.

Methodology (complete and reproducible)

Subscores are percentiles (0–100) across the 51 jurisdictions; the composite is a weighted sum: hail 30%, freeze-thaw 25%, commute exposure 20%, rural-road proxy 15%, vehicle exposure 10%.

• Hail: NOAA Storm Prediction Center severe-weather report archive (1955–2024 file), filtered to reports of 1.0-inch-plus hail from 2005–2024, counted per state and normalized to reports per 10,000 square miles per year (Census land areas).
• Freeze-thaw: NOAA Climate at a Glance statewide December–February minimum- temperature means, 1996–2025. States score highest when mean winter lows sit in the cycling band near 27°F — crossing freezing repeatedly — and lower when winters stay frozen or never freeze.
• Commute exposure: ACS 2023 5-year table B08303 — share of workers commuting 30+ minutes.
• Rural-road proxy: inverse population density (ACS B01003 over land area), a saturating transform — gravel and chip-seal exposure correlates with low density.
• Vehicle exposure: ACS B08201 — estimated vehicles per household.

Flags: DC uses the Maryland climate series and its 61-square-mile land area inflates per-area hail normalization; Hawaii has no NOAA statewide series and scores freeze-thaw 0; Alaska uses its NOAA series (id 50) with sparse hail reporting. All three are marked in the CSV.

License: The dataset is CC BY 4.0 — free to republish with attribution to “WindshieldHawk 2026 Windshield Hazard Index.” Sources: NOAA SPC, NOAA NCEI Climate at a Glance, U.S. Census Bureau ACS. This study reports hazard exposure, not prices; WindshieldHawk publishes no pricing data.