Why humidity turns 95° deadly, the dew point that forecasters trust, and the wind-chill flip side — computed free.
Temperature + humidity → the NWS heat index, with the caution/danger bands and why 95°F at 70% humidity is a 124°F day for your body.
One tool, the whole 'apparent temperature' logic: heat index when hot, wind chill when cold, plain temperature between — exactly how weather apps decide.
Magnus-formula dew point from any T/RH pair — the absolute-mugginess number meteorologists trust over relative humidity, with comfort bands.
Canada's muggy-weather number: temperature + dew point → humidex, with the comfort bands Environment Canada actually uses.
The NWS/Environment Canada wind-chill formula with frostbite-time bands — what moving air really does to exposed skin at any temperature.
METAR gives you temperature and dew point — this gives you the RH: Magnus vapor-pressure ratio, plus what happens to RH as the day heats up.
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