What Stands Out in Iowa
The clearest statewide peak usually shows up in July. The South generally runs warmer than the North. Des Moines is one of the strongest higher-WBGT examples in the state, while Cedar Rapids is a useful contrast. Local city pages are more useful than a single statewide assumption when you are planning around heat.
Seasonal WBGT Patterns
Iowa is more of a summer-peak WBGT state than a season-long high-WBGT state. The clearest signal usually concentrates around July. The South tends to run warmer than the North, even though the overall pattern is less persistent than in the South.
Safety Planning Note
For outdoor planning in Iowa, the main job is being ready for the midsummer peak and checking the city-level pattern before assuming one statewide story. That is especially useful for practices, tournaments, work shifts, and events scheduled around the hottest part of summer.