Frost history / Port Wing, WI
Port Wing, WI: frost dates by year
Last spring and first fall frost at NOAA station USC00476772, 1951 to 2006, measured from daily minimum temperatures.
Elevation 651 ft, 46.778, -91.386. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 22 | Sep 28 |
| Earliest | May 5 (2001) | Aug 24 (1977) |
| Latest | Jun 16 (1980) | Nov 3 (2004) |
| Trend | little change (less than half a day per decade) | 2.1 days later per decade |
| Years with data | 38 | 35 |
At 28°F (hard freeze) the median last spring date is May 9 and the median first fall date is Oct 9.
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 | May 22 | no data | Apr 26 | no data |
| 2005 | May 16 | Oct 8 | May 3 | Nov 14 |
| 2004 | May 19 | Nov 3 | May 15 | Nov 9 |
| 2003 | May 24 | Sep 29 | May 4 | Oct 2 |
| 2002 | May 21 | Oct 3 | May 20 | Oct 14 |
| 2001 | May 5 | Sep 25 | Apr 18 | Oct 7 |
| 2000 | Jun 9 | Sep 24 | May 19 | Nov 15 |
| 1999 | May 14 | Oct 3 | Apr 29 | Oct 3 |
| 1997 | Jun 1 | Oct 24 | Apr 29 | Oct 26 |
| 1995 | Jun 9 | no data | May 7 | no data |
| 1994 | Jun 9 | Oct 2 | May 10 | Oct 10 |
| 1993 | no data | Sep 19 | no data | Oct 5 |
| 1992 | no data | Sep 22 | no data | Oct 18 |
| 1984 | May 9 | Sep 26 | May 3 | Oct 29 |
| 1983 | May 17 | Sep 23 | Apr 18 | Nov 4 |
| 1982 | May 21 | Oct 17 | Apr 21 | Oct 20 |
| 1981 | May 18 | no data | May 11 | no data |
| 1980 | Jun 16 | Sep 26 | Apr 28 | Oct 13 |
| 1978 | May 21 | no data | May 7 | no data |
| 1977 | May 10 | Aug 24 | May 10 | Oct 2 |
| 1974 | May 13 | no data | May 9 | no data |
| 1973 | May 29 | Sep 20 | May 29 | Sep 20 |
| 1972 | May 9 | Sep 22 | May 9 | Oct 9 |
| 1971 | Jun 9 | no data | May 10 | no data |
| 1970 | May 6 | Sep 28 | Apr 14 | Oct 11 |
| 1969 | May 25 | Oct 13 | Apr 28 | Oct 22 |
| 1968 | May 23 | Oct 5 | May 5 | Oct 29 |
| 1967 | Jun 1 | Sep 29 | May 15 | Sep 29 |
| 1966 | May 30 | Sep 26 | May 10 | Oct 12 |
| 1965 | Jun 15 | Sep 26 | Apr 28 | Oct 4 |
| 1964 | Jun 4 | no data | May 14 | no data |
| 1963 | May 22 | Sep 13 | May 22 | Sep 13 |
| 1962 | Jun 12 | Sep 20 | May 9 | Sep 20 |
| 1961 | no data | Oct 2 | no data | Oct 2 |
| 1960 | May 14 | no data | May 12 | no data |
| 1958 | no data | Oct 1 | no data | Nov 7 |
| 1957 | May 20 | Sep 20 | May 16 | Sep 27 |
| 1956 | May 25 | Sep 8 | May 16 | Sep 20 |
| 1955 | May 17 | Oct 2 | May 17 | Oct 2 |
| 1954 | May 26 | Oct 5 | May 20 | Oct 18 |
| 1953 | May 21 | Sep 13 | May 17 | Oct 7 |
| 1952 | May 18 | Oct 5 | Apr 24 | Oct 5 |
| 1951 | no data | Sep 29 | no data | Oct 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.