Source: https://guthlabs.ai/docs/instruments/wind-chill/implementation/

instrument implementation / implementation-contract

# Wind Chill implementation

A source-bound implementation contract for Wind Chill; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t4-278

**Effect**: Computation or source lookup only

## Input and validation requirements

The instrument needs explicit rejection for negative wind speeds because the plain-JavaScript power operation returns NaN. It also needs boundary enforcement and clear temperature-unit handling; otherwise out-of-range or ambiguously interpreted inputs can produce misleading results.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "air_temperature_F": 30,
    "wind_speed_mph": 10
  },
  "expected_outputs": {
    "wind_chill_F": 21.25
  },
  "working": "V^0.16 = 10^0.16 = 1.44543977. 35.74 + 0.6215×30 = 35.74 + 18.645 = 54.385. -35.75×1.44543977 = -51.67447180. 0.4275×30×1.44543977 = 12.825×1.44543977 = 18.53776506. WC = 54.385 - 51.67447180 + 18.53776506 = 21.24829326 °F, which rounds to 21.25 °F."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/wind-chill/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/wind-chill/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/wind-chill/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche4/tranche4-results.json`