Of all the months of the year, September may be the most skewed in terms of record low temperatures in Fargo-Moorhead. All the September record lows are old. The most recent was 41 years ago on Sept. 16, 1973. Of the 30 days in September, 12 were recorded during the 1880s with an amazing six set in 1885 alone during a remarkable seven-day stretch of early season cold Sept. 1-7.
Five of the remaining record lows were set in the 1890s for a total of 17 out of the 30 record lows of the month still dating to the 1800s. The remaining 13 record lows are scattered randomly, one or two most decades, until 1973, and there have been no September record lows since then.
Not surprisingly, this 41-year ongoing void of September record lows accompanies a trend of the average first frost date moving about two weeks later from its average a few decades ago.