Next 24 hours — pavement temperature under each hour
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Most "hot pavement" advice is a static infographic. This tool actually computes it. For each forecast hour we:
- Find the sun's angle for your latitude and the time of day (NOAA solar-position algorithm).
- Estimate clear-sky sunlight reaching the ground (Haurwitz model), then dim it for clouds using the NWS sky-cover forecast (Kasten–Czeplak).
- Heat the pavement above air temperature from that absorbed sunlight, shedding heat with wind. The model is calibrated to published asphalt readings — air 77°F → ~125°F asphalt, air 87°F → ~143°F. Concrete runs cooler.
- Translate to the hand test: around 125°F, skin starts to burn within a minute, so that's where "7 seconds" becomes "1 second."
Heat risk uses the NWS heat index (panting struggles in humidity); cold uses NWS wind chill; air quality is the US AQI from Open-Meteo. The hourly verdict is the worst factor, not an average — one dangerous number is enough to skip the walk. Pavement estimates are ±5°F; when in doubt, do the real hand test.
Weather: National Weather Service (api.weather.gov). Air quality: Open-Meteo. No API key, no ads, no tracking — the forecast math runs in your browser. No account needed; an optional sign-in only syncs your dogs across devices (privacy).