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Update feels_like temperature formula (#3869)

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The current logic never showed any different temperature than the
current one, so I looked into a more "explained" formula and found one
in the HomeAssistant forums.
This commit is contained in:
Veeck
2025-09-01 15:12:52 +02:00
committed by GitHub
parent f8679b6ba8
commit 25efe4204f
3 changed files with 59 additions and 17 deletions
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63
modules/default/weather/weatherutils.js
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@@ -61,6 +61,15 @@ const WeatherUtils = {
return unit === "imperial" ? tempInC * 1.8 + 32 : tempInC;
},
/**
* Convert temp (from degrees C) into metric unit
* @param {number} tempInF the temperature in Fahrenheit you want to convert
* @returns {number} the converted temperature
*/
convertTempToMetric (tempInF) {
return ((tempInF - 32) * 5) / 9;
},
/**
* Convert wind speed into another unit.
* @param {number} windInMS the windspeed in meter/sec you want to convert
@@ -118,27 +127,51 @@ const WeatherUtils = {
return kmh * 0.27777777777778;
},
/**
* Taken from https://community.home-assistant.io/t/calculating-apparent-feels-like-temperature/370834/18
* @param {number} temperature temperature in degrees Celsius
* @param {number} windSpeed wind speed in meter/second
* @param {number} humidity relative humidity in percent
* @returns {number} the feels like temperature in degrees Celsius
*/
calculateFeelsLike (temperature, windSpeed, humidity) {
const windInMph = this.convertWind(windSpeed, "imperial");
const tempInF = this.convertTemp(temperature, "imperial");
let feelsLike = tempInF;
if (windInMph > 3 && tempInF < 50) {
feelsLike = Math.round(35.74 + 0.6215 * tempInF - 35.75 * Math.pow(windInMph, 0.16) + 0.4275 * tempInF * Math.pow(windInMph, 0.16));
} else if (tempInF > 80 && humidity > 40) {
feelsLike
= -42.379
+ 2.04901523 * tempInF
+ 10.14333127 * humidity
- 0.22475541 * tempInF * humidity
- 6.83783 * Math.pow(10, -3) * tempInF * tempInF
- 5.481717 * Math.pow(10, -2) * humidity * humidity
+ 1.22874 * Math.pow(10, -3) * tempInF * tempInF * humidity
+ 8.5282 * Math.pow(10, -4) * tempInF * humidity * humidity
- 1.99 * Math.pow(10, -6) * tempInF * tempInF * humidity * humidity;
let HI;
let WC = tempInF;
// Calculate wind chill for certain conditions
if (tempInF <= 70 && windInMph >= 3) {
WC = 35.74 + (0.6215 * tempInF) - 35.75 * Math.pow(windInMph, 0.16) + ((0.4275 * tempInF) * Math.pow(windInMph, 0.16));
}
return ((feelsLike - 32) * 5) / 9;
// Steadman Heat Index Vorberechnung
const STEADMAN_HI = 0.5 * (tempInF + 61.0 + ((tempInF - 68.0) * 1.2) + (humidity * 0.094));
if (STEADMAN_HI >= 80) {
// Rothfusz-Komplex
const ROTHFUSZ_HI = -42.379 + 2.04901523 * tempInF + 10.14333127 * humidity - 0.22475541 * tempInF * humidity - 0.00683783 * tempInF * tempInF - 0.05481717 * humidity * humidity + 0.00122874 * tempInF * tempInF * humidity + 0.00085282 * tempInF * humidity * humidity - 0.00000199 * tempInF * tempInF * humidity * humidity;
HI = ROTHFUSZ_HI;
if (humidity < 13 && tempInF > 80 && tempInF < 112) {
const ADJUSTMENT = ((13 - humidity) / 4) * Math.pow(Math.abs(17 - (tempInF - 95)), 0.5) / 17; // sqrt Teil
HI = HI - ADJUSTMENT;
} else if (humidity > 85 && tempInF > 80 && tempInF < 87) {
const ADJUSTMENT = ((humidity - 85) / 10) * ((87 - tempInF) / 5);
HI = HI + ADJUSTMENT;
}
} else { HI = STEADMAN_HI; }
// Feuchte Lastberechnung FL
let FL;
if (tempInF < 50) { FL = WC; }
else if (tempInF >= 50 && tempInF < 70) { FL = ((70 - tempInF) / 20) * WC + ((tempInF - 50) / 20) * HI; }
else if (tempInF >= 70) { FL = HI; }
return this.convertTempToMetric(FL);
},
/**