the.com/wind chill

means The temperature it actually feels like on exposed skin when wind speed is factored in with the air temperature, since moving air strips away heat faster than still air does.

from A 20th-century coinage from science, not folklore — the concept traces to Antarctic expedition research in the 1940s, where researchers measured how fast water froze in a plastic container exposed to wind, then built formulas linking wind speed and cooling rate. The term paired an old word, 'wind,' with 'chill,' a word rooted in Old English 'cele'/'ciele' meaning cold, to name a felt-cold that thermometers alone couldn't capture. Meteorologists later refined the formula using actual facial heat-loss models, so the number you see on a forecast is a descendant of real exposed-skin experiments, not just a vibe.