Frost history / Ontonagon 6 Se, MI
Ontonagon 6 Se, MI: frost dates by year
Last spring and first fall frost at NOAA station USC00206220, 1978 to 2014, measured from daily minimum temperatures.
Elevation 790 ft, 46.834, -89.207. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 31 | Sep 25 |
| Earliest | May 12 (2001) | Sep 6 (1988) |
| Latest | Jul 1 (1988) | Oct 17 (2013) |
| Trend | 4.8 days earlier per decade | 1.8 days later per decade |
| Years with data | 35 | 33 |
At 28°F (hard freeze) the median last spring date is May 18 and the median first fall date is Oct 8.
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 |
|---|---|---|---|---|
| 2014 | May 17 | no data | May 16 | no data |
| 2013 | Jun 18 | Oct 17 | May 24 | Oct 28 |
| 2012 | Jun 1 | Sep 25 | Apr 29 | Oct 12 |
| 2011 | May 27 | Sep 16 | May 27 | Oct 1 |
| 2010 | May 15 | Sep 19 | May 11 | Oct 3 |
| 2009 | Jun 3 | Sep 30 | May 31 | Oct 10 |
| 2008 | May 28 | Oct 4 | May 27 | Oct 17 |
| 2007 | May 20 | Sep 15 | Apr 24 | Oct 23 |
| 2006 | May 22 | Sep 9 | May 6 | Sep 9 |
| 2005 | May 16 | Oct 8 | May 12 | Nov 8 |
| 2004 | May 31 | no data | May 7 | no data |
| 2003 | no data | Sep 29 | no data | Sep 29 |
| 2002 | May 21 | no data | May 21 | no data |
| 2001 | May 12 | Sep 25 | Apr 18 | Sep 25 |
| 2000 | Jun 5 | Sep 25 | May 19 | Sep 28 |
| 1999 | no data | Oct 3 | no data | Oct 3 |
| 1998 | Jun 5 | Oct 3 | May 10 | Oct 22 |
| 1997 | May 27 | Oct 1 | May 22 | Oct 16 |
| 1996 | May 30 | Oct 8 | May 12 | Oct 8 |
| 1995 | May 26 | Sep 8 | Apr 30 | Nov 3 |
| 1994 | Jun 8 | no data | Jun 3 | no data |
| 1993 | May 17 | Sep 19 | May 1 | Sep 30 |
| 1992 | Jun 22 | Sep 23 | Jun 21 | Sep 23 |
| 1991 | May 19 | Sep 27 | May 18 | Sep 27 |
| 1990 | Jun 4 | Oct 8 | May 30 | Oct 8 |
| 1989 | Jun 15 | Sep 24 | May 11 | Sep 24 |
| 1988 | Jul 1 | Sep 6 | May 24 | Oct 13 |
| 1987 | May 24 | Sep 25 | May 12 | Oct 3 |
| 1986 | Jun 5 | Sep 7 | Jun 2 | Oct 10 |
| 1985 | Jun 3 | Sep 25 | Apr 27 | Oct 7 |
| 1984 | May 30 | Sep 27 | May 29 | Sep 29 |
| 1983 | Jun 7 | Oct 9 | May 26 | Oct 15 |
| 1982 | Jun 16 | Sep 21 | May 21 | Oct 17 |
| 1981 | May 19 | Sep 22 | May 18 | Sep 22 |
| 1980 | Jun 16 | Sep 17 | Jun 10 | Oct 4 |
| 1979 | Jun 24 | Sep 19 | May 25 | Oct 14 |
| 1978 | Jun 8 | Sep 25 | May 6 | Oct 14 |
"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.