Frost history / Grand Marais 2 E, MI
Grand Marais 2 E, MI: frost dates by year
Last spring and first fall frost at NOAA station USW00014859, 1951 to 2006, measured from daily minimum temperatures.
Elevation 624 ft, 46.667, -85.950. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 11 | Sep 23 |
| Earliest | May 17 (2005) | Aug 3 (1952) |
| Latest | Jul 23 (1985) | Nov 1 (1971) |
| Trend | 0.7 days later per decade | 1.5 days later per decade |
| Years with data | 54 | 51 |
At 28°F (hard freeze) the median last spring date is May 26 and the median first fall date is Oct 10.
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 |
|---|---|---|---|---|
| 2006 | Jun 11 | no data | May 6 | no data |
| 2005 | May 17 | no data | Apr 21 | no data |
| 2004 | Jun 4 | Oct 5 | May 29 | Oct 19 |
| 2003 | Jun 4 | Oct 1 | May 21 | Nov 2 |
| 2002 | Jun 18 | Oct 8 | Jun 3 | Oct 14 |
| 2001 | Jun 23 | Sep 29 | May 31 | Sep 29 |
| 2000 | Jul 19 | Aug 20 | May 27 | Sep 28 |
| 1999 | Jun 17 | Oct 3 | May 14 | Oct 4 |
| 1998 | Jun 9 | Sep 23 | May 30 | Oct 4 |
| 1997 | Jun 17 | Sep 26 | May 27 | Oct 17 |
| 1996 | Jun 9 | Sep 19 | May 30 | Oct 4 |
| 1995 | Jun 12 | Sep 8 | Jun 9 | Oct 17 |
| 1994 | Jun 9 | Sep 10 | Jun 9 | Nov 2 |
| 1993 | Jun 4 | Sep 16 | May 27 | Sep 19 |
| 1992 | Jul 21 | Aug 13 | Jun 22 | Sep 23 |
| 1991 | Jun 13 | Sep 28 | May 19 | Sep 28 |
| 1990 | May 29 | Sep 17 | May 13 | Oct 20 |
| 1989 | Jun 5 | Sep 27 | Jun 5 | Sep 27 |
| 1988 | Jun 17 | Sep 26 | Jun 17 | Nov 3 |
| 1987 | Jun 10 | Sep 3 | May 24 | Oct 20 |
| 1986 | Jun 24 | Oct 5 | Jun 2 | Oct 10 |
| 1985 | Jul 23 | Sep 13 | May 22 | Oct 11 |
| 1984 | Jun 15 | Oct 1 | May 16 | Oct 29 |
| 1983 | Jul 6 | Sep 15 | May 28 | Oct 9 |
| 1982 | Jun 26 | Sep 8 | Jun 3 | Sep 22 |
| 1981 | Jun 7 | Sep 22 | May 31 | Sep 24 |
| 1980 | no data | Sep 24 | no data | Sep 24 |
| 1979 | Jun 24 | Aug 16 | May 22 | Oct 11 |
| 1978 | Jun 14 | Oct 15 | May 7 | Oct 15 |
| 1977 | Jun 13 | Oct 10 | Jun 9 | Oct 17 |
| 1976 | Jun 2 | Aug 30 | May 19 | Oct 24 |
| 1975 | May 29 | Sep 25 | Apr 27 | Oct 19 |
| 1974 | May 27 | Sep 23 | May 19 | Oct 3 |
| 1973 | May 30 | Sep 21 | May 30 | Nov 5 |
| 1972 | Jun 17 | Oct 10 | Jun 17 | Oct 10 |
| 1971 | Jun 9 | Nov 1 | Jun 1 | Nov 5 |
| 1970 | May 20 | Sep 29 | May 6 | Oct 19 |
| 1969 | Jun 21 | Oct 18 | May 26 | Oct 22 |
| 1968 | Jul 10 | Sep 28 | May 10 | Nov 4 |
| 1967 | May 31 | Sep 23 | May 22 | Oct 7 |
| 1966 | no data | Oct 13 | no data | Oct 13 |
| 1965 | Jun 14 | no data | Apr 25 | no data |
| 1964 | Jun 3 | Sep 28 | Apr 25 | Oct 6 |
| 1963 | May 23 | Oct 30 | May 12 | Nov 1 |
| 1962 | Jun 3 | Oct 23 | Apr 20 | Oct 25 |
| 1961 | Jun 11 | no data | May 17 | no data |
| 1960 | Jul 1 | Sep 16 | May 13 | Oct 24 |
| 1959 | Jun 23 | no data | May 17 | no data |
| 1958 | Jul 20 | Aug 23 | Jun 18 | Sep 2 |
| 1957 | Jun 8 | Aug 25 | Jun 8 | Sep 26 |
| 1956 | Jun 3 | Aug 20 | Jun 2 | Sep 9 |
| 1955 | Jun 1 | Sep 7 | May 20 | Sep 7 |
| 1954 | Jul 3 | Aug 26 | May 27 | Sep 9 |
| 1953 | May 28 | Sep 13 | May 28 | Sep 14 |
| 1952 | Jun 4 | Aug 3 | May 7 | Sep 7 |
| 1951 | Jun 7 | Sep 25 | Jun 7 | Sep 25 |
"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.