Disclaimer
The label on your product always wins. Every threshold on this site is a typical value across product classes, not the spec of your can, pail, or bag. Formulas vary — low-temperature paints exist, fast-set sealers exist, and your manufacturer's number is the one that voids or honors your warranty.
Forecasts are forecasts
Verdicts are computed from Open-Meteo model output, which — like every forecast — is sometimes wrong, especially beyond day 5 and around convective storms. A GOOD chip is a good bet, not a guarantee. Check the sky, the radar, and the surface you're about to coat before opening anything.
Climatology is not a forecast at all
"Best months" tables are computed from NOAA 1991–2020 normals — a 30-year average. They rank months; they do not promise that any specific week will cooperate. The formula and its limitations are documented on the methodology page.
Concrete: DIY scope only
Concrete pages address small non-structural pours — walkways, pads, fence posts. They are not engineering guidance. Footings, foundations, retaining walls, and anything load-bearing or inspected follow your engineer's drawings, ACI practice, and local code, in that order, regardless of anything this site says about the weather.
Safety
Roof work, ladders, pressure washers, and wet slabs carry real injury risk that no forecast mitigates. Wind limits on this site are coating limits first; your safety limits may need to be stricter. When a page says a windy day is a NO for safety on a roof, believe it.
Affiliate content
Gear sections may contain affiliate links when the program is enabled; they're labeled, and the policy is in the affiliate disclosure. No manufacturer pays for placement in rule tables or verdicts — thresholds come only from the published consensus documented on the sources page.