Paul Allman Siple and Charles F. Passel created the first rudimentary wind chill tables and formulas while exploring the Antarctic prior to World War II.
They used a little plastic bottle filled with water and suspended from the expedition hut roof to chart the effects of cold air on its contents.
Based on the contents of the bottle and anemometer readings, they crafted the first wind chill index. (Commonly used in weather monitoring, an anemometer measures wind speed.)
The system that Siple and Passel developed provided them with a fairly accurate means of quantifying weather conditions.
By the 1960s, the wind chill equivalent temperature became the predominant way to report wind chill.
The wind chill equivalent temperature equated to the temperature at which the wind chill index would feel the same without the presence of wind.
The early readings exaggerated the extremity of many weather conditions.
It assumed two faulty things:
- That humans stay still for long periods of time when outside.
- That completely windless conditions actually exist in nature.
Charles Eagan came along and adjusted the absence of wind to 1.8 meters per second, or the lowest speed that an anemometer can read.
More accurate representations of actual outdoor conditions.
Paul Allman Siple and Charles F. Passel created wind chill prior to WWII. Though faulty, it was widely used by the 1960's. The formula was later modified by Charles Eagan and standardized between the US, UK, and Canada in 2001.