Evaluate the NWS wind-chill formula only within its stated temperature/wind domain and inspect a validity-aware sensitivity map.
01 / PURPOSE-SPECIFIC INPUTS
The NWS formula applies only at T≤50°F and wind>3 mph. Outside that domain the tool returns “Wind chill formula not applicable,” never an official estimate.
02 / RESULT & INTERACTIVE INSPECTION
Wind chill estimates apparent cooling under the stated NWS model; it is not actual air temperature, an object’s final temperature, a frostbite timer or personalized medical advice. Conditions such as sun exposure and local shelter are not inferred.
The wind chill is below freezing. Protect exposed skin and seek shelter from the wind; the apparent temperature alone does not establish that skin will freeze.
Cover exposed skin, including ears, nose, fingers and toes. Wear warm, insulated layers, keep clothing dry and seek shelter during dangerous cold.
NWS notes that actual air near the skin must be below freezing for frostbite to develop on exposed skin. Cold exposure can still cause hypothermia above freezing.
Wind chill is an apparent-temperature estimate, not an individual’s skin temperature, a diagnosis or a guaranteed exposure limit. No frostbite exposure time is calculated.
Sources: NWS: Understanding Wind Chill · NWS: During Extremely Cold Weather.
Inspector: 30 °F, 10 mph → 21.24829 °F. User point: 21.24829 °F.
Enter your values locally; no inputs are uploaded.
Check validation feedback before reviewing the browser-generated result.
Review the explanation, copy supported outputs or reset the workspace.
The supplied US National Weather Service equation is WCT=35.74+0.6215T−35.75V^0.16+0.4275TV^0.16, with air temperature T in degrees Fahrenheit and wind speed V in miles per hour.
Evaluate the NWS wind-chill formula only within its stated temperature/wind domain and inspect a validity-aware sensitivity map. Inspect actual calculated quantities with accessible controls and review the worked unit conversions and assumptions.
Wind Chill Calculator calculates locally in browser memory. Entered circuit values, grades, temperatures and conductor measurements are not sent to a third-party processing service or stored as a personal profile. Ordinary page requests may still be logged. Clipboard access occurs only after choosing Copy Result.
The supplied US National Weather Service equation is WCT=35.74+0.6215T−35.75V^0.16+0.4275TV^0.16, with air temperature T in degrees Fahrenheit and wind speed V in miles per hour.
It applies only at air temperature at or below 50°F and wind speed greater than 3 mph. Exactly 3 mph is excluded. Outside this domain, the tool displays Wind chill formula not applicable and does not label an invalid estimate as official.
Celsius input converts to Fahrenheit and km/h or m/s converts to mph before evaluation. A Celsius result is converted from computed Fahrenheit wind chill using (WCT_F−32)×5/9, not a different equation.
The axes show air temperature and wind speed, with a purple marker for the entered point. Exact invalid regions are hatched; valid cell-center samples use the same equation. A separate inspector can explore conditions without replacing the submitted input.
No. It is an apparent cooling estimate under the model, not actual air temperature or an object’s final temperature. Solar exposure, shelter and other local conditions are not inferred.
No. The calculator is not a frostbite timer, exposure-safety guarantee or personalized medical assessment. Applicability and unit conversions are explicit, and rounding affects only the displayed values.