buncha/engineering/weather-feel

Wind Chill & Heat Index

Drag the sliders. The scene below changes as the temperature does — sky colour, the figure's clothes, weather effects, the comparison phrase you'd actually use to describe it.

Feels like

16°F

Air 28°F−12°F from wind

Standing in fresh winter air; below freezing.

Air temperature

28°F

Wind speed

15 mph

Humidity

55%

dry air

Formulas: NWS wind chill (2001 revision), Rothfusz heat index, Magnus-Tetens dew point. Risk windows from NWS frostbite + heat index charts. Runs entirely in your browser.

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About Wind Chill & Heat Index

How cold it really feels with wind, how hot it really feels with humidity — visualised. A live scene shows what the temperature looks like (parka in arctic cold, sweat in extreme heat, snow drifting in below freezing, sun rays beating down past 85°F). NWS wind-chill formula below 50°F, Rothfusz heat-index above 80°F, plus real-world comparison phrases and a frostbite/heatstroke risk window.

Everything happens on your device. Close the tab and it's gone.