Last week I mentioned that by the end of September the chance for frost and an actual killing frost becomes a very big possibility. In looking through my records I did find that most killing frosts occur in October but they do happen at times in September. I asked the people at the Aberdeen Weather Service what constitutes a killing frost and they said that any temperature that drops to 28 degrees and stays there a number of hours is considered a killing frost.
The following are the killing frosts that I recorded in the last 47 years during September.
1981: Killing frost on September 17th of 28°. Stayed below freezing for 4 hours.
1982: Killing frost on the 21st at 27° followed by a 22 reading on the 24th.
1983: Killing frost on the 21st at 28° followed by readings of 20, 22 and 26 making it official.
1984: Killing frost of 16° on the 26th. High temp. for this day was only 26°.
1989: Killing frost on the 23rd of 26°. There were nine nights during this month of September that were in the low 30s.
1991: Nine low readings in the 30s & 20s with the lowest on the 20th at a killing frost of 20°.
1992: Killing frost on the 28th of 21°.
1995: A definite killing frost on the 22nd at 22° after two mornings at 28° before this.
2012: Killing frost on the 22nd & 23rd (25 & 26°).
(You can see that the only September that has had a real killing frost since 1995 was 2012. A period of 26 years.)
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