Guides
Plain answers, with sources: wind for weed spraying, cold for concrete, soil temperature for pre-emergent, and the temperature pipes freeze at.
- Is it too windy to spray weeds?The 3–10 mph rule, why dead calm is risky too, heat, and rain.
- How cold is too cold to pour concrete?ACI's 40°F cold-weather line, the 48-hour freeze rule, heat and rain.
- When to put down pre-emergent: soil temperature and GDDSoil at 55°F, 200 GDD, watering it in, and the month your city usually gets there.
- Will my pipes freeze at 28°F?Where the 20°F rule comes from, the exceptions, and nights below 20°F by city.
Fairsky is not a substitute for official warnings. For warnings, go to weather.gov.
Live forecasts: National Weather Service / NOAA (public domain), fetched by your browser. Climate averages: NOAA NCEI U.S. Climate Normals, 1991–2020 (public domain). Activity thresholds: product data sheets, ACI and university extension guidance, linked on each page; your product’s label wins.