Can I ___ today?
Most weather sites tell you it'll be 58° and cloudy. These pages tell you whether to stain the deck. Pick a project, then your city: you get a live verdict from the National Weather Service forecast, the next good window, and the months that usually work there.
- Stain a deckDeck and fence stain: 50–90°F, dry wood, 24 rain-free hours after.
- Paint a house exteriorExterior latex paint: 40°F and up, 5°F above the dew point, 4 dry hours after.
- Pour concreteConcrete: 40–85°F, no rain for 24 hours, no freezing for 48.
- Spray weedsWeed killer: 3–10 mph wind, 45–85°F, 4 rain-free hours after.
- Apply pre-emergentCrabgrass pre-emergent: before soil holds 55°F (about 200 GDD), then water it in.
- Plant grass seedCool-season grass seed: soil about 50–65°F, highs 60–80°F, no washout rain.
- Seal a drivewayAsphalt sealcoat: 55°F and rising, 50°F overnight, 36 rain-free hours.
- Cover plants for frostFrost watch: cover at 34°F, or 36°F on clear, calm nights; 28°F is a hard freeze.
These eight have city pages. The app covers 47 activities in all, from mowing and hanging holiday lights to a run, a round of golf or a flight: see every activity and its rules.
Guides
- 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.
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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). Project thresholds: product data sheets, ACI and university extension guidance, linked on each page; your product’s label wins.