A walkthrough, end to end.
- 1
Enter the air temperature and wind speed.
- 2
Pick units: Fahrenheit + mph or Celsius + km/h.
- 3
See the wind chill (feels-like) temperature.
NWS wind chill (2001 revision)
Valid for T ≤ 50°F and wind ≥ 3 mph. WC(°F) = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275T·V^0.16. Metric: WC(°C) = 13.12 + 0.6215T − 11.37V^0.16 + 0.3965T·V^0.16, T in °C, V in km/h.
What you can do with this.
Winter dressing
Pick layers based on the felt temperature.
Outdoor work safety
Watch for frostbite-risk thresholds.
Sports planning
Decide whether to skip an outdoor run.
Hiking & camping
Wind chill matters for cold-weather gear.
Pets outside
Estimate safe outdoor time for animals.
School/sports cancellations
Districts often use a wind-chill cutoff.
Travel safety
Wind chill affects exposure on roadside breakdowns.
Wind chill 2026 — what's current
NWS revised formula remains standard.
Frequently asked.
Standard NWS formula is intended for T ≤ 50°F (10°C) and wind ≥ 3 mph (4.8 km/h).
Wind chill isn't meaningful at warm temperatures — use heat index instead.
No. Calculations run locally.
Roughly: 30 min at WC −18°F (−28°C), 10 min at −35°F (−37°C), 5 min below −60°F (−51°C).