Morenci, MI: frost dates by year

Last spring and first fall frost at NOAA station USC00205603, 2004 to 2025, measured from daily minimum temperatures.

Elevation 770 ft, 41.722, -84.215. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 1	Oct 17
Earliest	Apr 16 (2007)	Sep 30 (2006)
Latest	May 16 (2014)	Oct 28 (2007)
Trend	0.5 days later per decade	5.8 days later per decade
Years with data	21	18

At 28°F (hard freeze) the median last spring date is Apr 26 and the median first fall date is Oct 27.

The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.

Chart

Last spring frost (32°F)

First fall frost (32°F)

Dots are single years. The gray line is the median, the green line the fitted trend.

Year by year

Year	Last spring 32°F	First fall 32°F	Last spring 28°F	First fall 28°F
2025	Apr 18	Oct 25	Apr 13	Nov 2
2024	Apr 25	Oct 17	Apr 25	Oct 27
2022	Apr 29	no data	Apr 29	no data
2021	May 12	Oct 24	May 1	Nov 2
2020	May 13	Oct 16	May 13	Oct 31
2019	Apr 28	Oct 12	Apr 15	Oct 13
2018	May 1	Oct 16	Apr 29	Oct 16
2017	May 9	Oct 26	Apr 8	Oct 26
2016	May 15	no data	Apr 13	no data
2015	Apr 28	Oct 17	Apr 25	Oct 18
2014	May 16	Oct 12	Apr 17	Nov 2
2013	May 13	Oct 22	Apr 26	Oct 25
2012	Apr 29	Oct 8	Apr 27	Oct 8
2011	Apr 22	Oct 22	Apr 6	Oct 29
2010	May 10	Oct 16	Apr 29	Oct 22
2009	Apr 24	Oct 1	Apr 13	Oct 11
2008	May 1	no data	May 1	no data
2007	Apr 16	Oct 28	Apr 15	Oct 28
2006	Apr 27	Sep 30	Apr 27	Oct 15
2005	May 6	Oct 17	May 5	Oct 29
2004	May 4	Oct 3	Apr 28	Nov 8

"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.