Frost history / Francis E Walter Dam, PA
Francis E Walter Dam, PA: frost dates by year
Last spring and first fall frost at NOAA station USC00363018, 1964 to 2025, measured from daily minimum temperatures.
Elevation 1,509 ft, 41.118, -75.728. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 17 | Oct 1 |
| Earliest | Apr 19 (2025) | Aug 30 (1965) |
| Latest | Jul 1 (1989) | Nov 3 (2021) |
| Trend | 3.7 days earlier per decade | 4.8 days later per decade |
| Years with data | 42 | 40 |
At 28°F (hard freeze) the median last spring date is Apr 30 and the median first fall date is Oct 13.
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 19 | Oct 10 | Apr 19 | Oct 10 |
| 2024 | Apr 28 | Oct 12 | Apr 27 | Oct 18 |
| 2023 | May 19 | Oct 10 | May 19 | Nov 1 |
| 2022 | May 1 | Oct 10 | Apr 19 | Oct 18 |
| 2021 | May 14 | Nov 3 | Apr 23 | Nov 3 |
| 2020 | May 21 | Sep 21 | May 13 | Oct 19 |
| 2019 | Apr 30 | Oct 5 | Apr 29 | Oct 19 |
| 2018 | May 1 | Oct 17 | Apr 23 | Oct 19 |
| 2017 | May 9 | Oct 17 | Apr 9 | Oct 17 |
| 2016 | May 16 | Oct 11 | Apr 24 | Oct 15 |
| 2015 | Apr 27 | Oct 11 | Apr 27 | Oct 18 |
| 2014 | May 19 | Oct 5 | Apr 18 | Oct 20 |
| 2013 | May 28 | Oct 21 | May 15 | Oct 23 |
| 2012 | May 11 | Oct 9 | Apr 30 | Oct 13 |
| 2011 | Apr 23 | Oct 6 | Apr 22 | Oct 31 |
| 2010 | May 11 | Oct 10 | May 11 | Nov 2 |
| 2009 | May 19 | Oct 11 | May 19 | Oct 12 |
| 1998 | Jun 5 | no data | Apr 30 | no data |
| 1997 | May 18 | Sep 22 | May 8 | Sep 22 |
| 1995 | no data | Sep 24 | no data | Nov 5 |
| 1992 | May 29 | no data | May 7 | no data |
| 1991 | May 21 | no data | May 5 | no data |
| 1990 | May 31 | Sep 18 | May 31 | Sep 18 |
| 1989 | Jul 1 | Sep 24 | May 9 | Sep 25 |
| 1988 | Jun 25 | Sep 16 | Apr 28 | Oct 7 |
| 1987 | May 14 | Sep 25 | May 1 | Oct 9 |
| 1986 | Jun 3 | Aug 30 | Apr 24 | Oct 11 |
| 1985 | May 9 | Oct 7 | May 9 | Oct 29 |
| 1984 | May 18 | Sep 7 | Apr 22 | Oct 6 |
| 1983 | May 28 | Sep 23 | May 18 | Oct 21 |
| 1982 | May 4 | Oct 3 | Apr 29 | Oct 12 |
| 1981 | May 9 | Sep 29 | May 7 | Oct 13 |
| 1980 | Jun 13 | Sep 27 | May 10 | Oct 6 |
| 1979 | Jun 27 | Sep 20 | Apr 21 | Sep 20 |
| 1978 | May 8 | Sep 26 | May 4 | Oct 10 |
| 1977 | May 16 | Oct 5 | May 15 | Oct 7 |
| 1976 | May 24 | Sep 23 | May 23 | Sep 29 |
| 1975 | May 3 | Sep 10 | Apr 28 | Oct 3 |
| 1974 | May 11 | Sep 24 | May 8 | Sep 24 |
| 1973 | no data | Sep 21 | no data | Oct 23 |
| 1967 | May 24 | no data | May 17 | no data |
| 1966 | May 11 | Oct 3 | May 11 | Oct 7 |
| 1965 | May 31 | Aug 30 | Apr 29 | Oct 5 |
| 1964 | Jun 5 | Sep 16 | Apr 26 | Oct 6 |
"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.