On February 3, 1947, the village of Snag, Yukon, set the record for the lowest official temperature ever recorded in Canada (and all of North America). The mercury dropped to a bone-chilling -63°C (−81.4°F). To give you an idea of how extreme that is, it is roughly the average surface temperature on Mars.
The alcohol in the standard thermometer dropped so low it fell off the scale. The weather observer, Gordon Toole, had to scratch a mark on the glass with a file so the instrument could be sent to a lab in Toronto for precise calibration.
Because the air was so dense and still, sounds carried over incredible distances. People at the Snag airport could clearly hear dogs barking in a village over 6 kilometers (nearly 4 miles) away. Exhaled breath didn’t just puff into a cloud; it supposedly made a “hissing” or “tinkling” sound as it froze instantly and fell to the ground as a fine white powder. People walking outside left “human contrails,” long streaks of frozen breath that would hang in the air for several minutes before dissipating.
The weather station at Snag operated from 1943 to 1966, and the record has never been broken. The name “Snag” itself comes from the Klondike gold rush era, when boats navigating the silty waters nearby would occasionally be punctured by submerged tree trunks.
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