- 8Cities compared
- 118 daysLongest calendar: Milwaukee
- 0Year-round cities
Wisconsin is not one climate: Milwaukee banks 118 workable roof coating days a year while Appleton gets 107 — a spread the table below itemizes month by month. Season boundaries mark the first and last month averaging 8+ workable days against the label rules (50–90°F, nights 40°F+).
If one month anchors the Wisconsin calendar it's July, the statewide leader in workable days. Use this page to pick the month, then the city page's 10-day strip to pick the days — and the national roof coating guide for the physics behind each rule.
Chasing the season across state lines? Step back to Roof Coating in West Virginia or push on to Roof Coating in Wyoming.
Cities in Wisconsin
| City | Peak months | Season | Workable days/yr |
|---|---|---|---|
| Milwaukee | Aug, Jul, Sep | May–October | 118 |
| Madison | Aug, Sep, Jul | May–October | 111 |
| Appleton | Aug, Sep, Jul | May–October | 107 |
| Green Bay | Aug, Sep, Jul | May–October | 108 |
| Racine | Jul, Aug, Sep | May–October | 118 |
| Kenosha | Jul, Aug, Sep | May–October | 109 |
| Eau Claire | Aug, Jul, Sep | May–October | 109 |
| La Crosse | Aug, Jul, Sep | May–October | 108 |
Top 8 Wisconsin calendars for roof coating
The rules behind these numbers
| Check | Threshold | Why it matters |
|---|---|---|
| Air temperature | 50–90°F | Acrylic and elastomeric coatings want 50°F+ during application and initial cure. |
| Overnight low | ≥40°F during the first 24 h | Water-based coatings can be ruined by a cold, damp night before they skin over. |
| Dry before | ≤0.05" rain in the prior 24 h; watch back to 48 h | The membrane must be dry — coatings trap moisture that later blisters. |
| Dry after | <0.05" rain for 24 h after (48 h thick coats want 48 h) | Rain inside 24 hours washes uncured coating into gutters. |
| Evening dew-point spread | ≥5°F from 6–11 pm | Roofs radiate heat at night and hit the dew point before anything else in the yard. |
| Daytime humidity | ≤85% | Humid air slows water-based coatings dramatically. |
| Wind | ≤15 mph (roller only, no spray up to 20 mph) | Wind on a roof is a safety limit first and an overspray limit second. |
Always follow your product label — formulas vary. The table above is the typical range across major manufacturers, not a promise about your can.
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