Daryl Ritchison, WDAY, Published October 01 2013
Weather Talk: Records look back at latest first sub-40-degree morningThe coldest temperature recorded at the airport last month was a 40-degree low on Sept. 21.
Since records began in 1881, there have been only three other Septembers without a low temperature in the 30s: 1905, 1948 and 1977. This is a minor correction from a post last week when I mentioned that in 1977 the first low below 40 was recorded on Sept. 29, but it was actually on Oct. 1 that year.
The average number of days in September with a low below 40 degrees is seven. Even last year, which was one of the warmest years on record, September 2012 recorded 11 such days, including an earlier-than-average first frost on Sept. 18.
The record for the latest first sub-40-degree morning was on Oct. 9, 1905. It appears we will not be breaking that record this year considering the cold air that is expected in the coming days, but at a minimum we at least will finish in second place.
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