Estimate wind chill from air temperature and wind speed using the National Weather Service formula.
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Wind chill
-19.4 °F
NWS formula: 35.74 + 0.6215T − 35.75V^0.16 + 0.4275TV^0.16; T in °F, V in mph.
35.74 + 0.6215 × 0 − 35.75 × 15^0.16 + 0.4275 × 0 × 15^0.16 = −19.4 °F
Results are shown to one decimal place; NWS reports heat index and wind chill in whole degrees.
Wind chill estimates exposed-skin cooling; it does not lower objects below the actual air temperature.
With T in Fahrenheit and V in mph: wind chill = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275TV^0.16.
At 0°F with 15 mph wind, the formula gives approximately −19.4°F, consistent with the NWS rounded example of −19°F.
NWS defines this index only at or below 50°F and above 3 mph. This tool additionally bounds inputs to −100°F and 150 mph. It estimates exposed-skin cooling, not the temperature of objects or a personalized safe exposure time.
Last updated . Results are estimates for informational purposes only.