NWS wind chill API

Computes the 2001-revision NWS/Environment Canada wind chill temperature with frostbite-risk timing and the cooling delta versus air temperature. Answers 'What is the wind chill at -10C with 30 km/h wind?', 'How fast can frostbite set in?'.

Price$0.04per request

MethodPOST

Route/v1/climate/wind-chill

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

wind-chillfeels-likenwsfrostbitecoldweatherthermal-comfortwinter

API URLhttps://x402.hexl.dev/v1/climate/wind-chill

Integration docs

Example request

{
  "tempC": -10,
  "windSpeedKmh": 30
}

Example response

{
  "windChillC": -19.52,
  "windChillF": -3.14,
  "tempC": -10,
  "windSpeedKmh": 30,
  "coolingDeltaC": 9.52,
  "frostbiteRisk": "30+ min",
  "applicable": true,
  "interpretation": "Feels like -19.5°C; 9.5°C colder than air temp.",
  "formula": "NWS/Environment Canada Wind Chill Index, 2001 revision"
}

Input schema

{
  "type": "object",
  "required": [
    "tempC",
    "windSpeedKmh"
  ],
  "properties": {
    "tempC": {
      "type": "number",
      "description": "Air temperature in Celsius",
      "examples": [
        -10
      ]
    },
    "windSpeedKmh": {
      "type": "number",
      "description": "Wind speed in km/h",
      "examples": [
        30
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}