Wind Chill Exposure

NWS 2001 wind chill formula and frostbite-time exposure curves.

Example

You enter

You get

Checked against published worked examples from: NWS.

Details, formula, and sources

Formula or tableNWS 2001 Wind Chill: WC = 35.74 + 0.6215 × T − 35.75 × V^0.16 + 0.4275 × T × V^0.16 (T °F, V mph, valid V ≥ 3 mph).

Source and editionNWS Wind Chill Temperature Index, 2001 revision.

What governsEstimate. AHJ and licensed professional govern.

API field namesT_F, wind_mph, wind_chill_F

Frostbite-time table not expected above -18 F wind chill; 30 min to -20 F; 10 min to -45 F; 5 min to -55 F; 2 min below that (rough piecewise of the NWS table)NWS Wind Chill Chart

Details, formula, and sources

Formula or tableNWS 2001 Wind Chill: WC = 35.74 + 0.6215 × T − 35.75 × V^0.16 + 0.4275 × T × V^0.16 (T °F, V mph, valid V ≥ 3 mph).

Source and editionNWS Wind Chill Temperature Index, 2001 revision.

Free accessFree at weather.gov/safety/cold-wind-chill.

What governsEstimate. AHJ and licensed professional govern.

Frostbite-time table not expected above -18 F wind chill; 30 min to -20 F; 10 min to -45 F; 5 min to -55 F; 2 min below that (rough piecewise of the NWS table)NWS Wind Chill Chart