WFO Denver/Boulder

...September 22 in Metro Denver weather history...
20-22 In 1902, a thunderstorm on the 20th, in advance of an apparent cold front, produced rain, hail, and northwest winds to 40 mph with gusts to 48 mph. Widespread rain developed behind the cold front and totaled 3.21 inches from the evening of the 20th through the early afternoon of the 22nd. The 2.70 inches of precipitation recorded from 800 PM on the 20th to 800 PM on the 21st is the greatest 24 hour precipitation ever recorded in the month of September. The temperature dipped from a high of 80 degrees on the 20th to a high of only 51 degrees on the 21st. 21-22 In 1870, strong winds occurred in the foothills and in Boulder and Denver. In 1895, rain changed to snow overnight and totaled 11.4 inches in downtown Denver. This was the first snowfall of the season and the second heaviest first snowfall of the season on record. North winds were sustained to 27 mph with gusts to 30 mph on the 21st. 22 In 1913, a thunderstorm produced northwest winds sustained to 40 mph with gusts to 44 mph. In 1946, a trace of snow fell in downtown Denver. This marked the start of the longest snow season on record, 263 days through June 11, 1947, when a trace of snow also fell.

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