Data sources & attribution
Everything on WorkWindow traces to three kinds of sources: NOAA climate normals for the month-by-month tables, Open-Meteo forecasts for the live 10-day check, and public geographic data for city locations and populations. Weather thresholds are a paraphrased consensus of product-label requirements from major manufacturers and industry bodies — never quoted, never attributed to a single brand.
NOAA NCEI — U.S. Climate Normals 1991–2020
Monthly climatology (average highs and lows, precipitation frequency, workable-day counts) is computed from the daily normals dataset published by NOAA's National Centers for Environmental Information: variables DLY-TMAX-NORMAL, DLY-TMIN-NORMAL, DLY-PRCP-PCTALL-GE001HI, and DLY-PRCP-PCTALL-GE050HI, per station, 1991–2020 base period. NOAA data is a U.S. Government work in the public domain. Each city page names its station and distance in the footer.
Open-Meteo
The live 10-day window check fetches forecasts from the Open-Meteo API directly from your browser. Weather data by Open-Meteo.com, licensed under CC BY 4.0. Open-Meteo aggregates national weather-service models; forecasts are theirs, verdicts are ours.
City locations & population
City names, coordinates, and populations come from the SimpleMaps US Cities Database (Basic, free tier), used under its license with this attribution.
Weather-rule thresholds
The rule tables on this site are a consensus of typical label requirements and published application guidance across classes of sources, restated in our own words:
- Deck stain, exterior paint, and roof coating: application guidelines of the major U.S. architectural-coatings manufacturers (the Behr/Sherwin-Williams class of consumer brands) and their low-temperature formula lines.
- Driveway sealer: application and cure guidance from major asphalt-sealer manufacturers.
- Concrete: bagged-mix producer guidance and American Concrete Institute (ACI) hot- and cold-weather concreting practice, scoped on this site to small DIY pours only.
- Grass seed: germination guidance from major seed producers and university extension programs, modeled for cool-season grasses.
No threshold on this site quotes any single product. Your product's label always wins. The complete machine-readable ruleset, and how it is scored, is on the methodology page.
Type
Headings are set in IBM Plex Sans Condensed (© IBM Corp.), self-hosted under the SIL Open Font License 1.1. Body text uses your system's native font stack. No third-party CDNs, trackers, or analytics load from this site.