Frost history / Safe Harbor Dam, PA
Safe Harbor Dam, PA: frost dates by year
Last spring and first fall frost at NOAA station USC00367732, 1995 to 2025, measured from daily minimum temperatures.
Elevation 195 ft, 39.925, -76.389. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 3 | Nov 13 |
| Earliest | Mar 19 (2005) | Oct 27 (2018) |
| Latest | May 9 (2020) | Dec 3 (2006) |
| Trend | 2.2 days later per decade | 0.5 days later per decade |
| Years with data | 25 | 25 |
At 28°F (hard freeze) the median last spring date is Mar 23 and the median first fall date is Nov 24.
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 10 | Nov 21 | Mar 4 | Dec 4 |
| 2024 | Mar 26 | Nov 14 | Mar 23 | Dec 1 |
| 2023 | Mar 31 | Nov 13 | Mar 21 | Nov 13 |
| 2022 | May 1 | Nov 15 | Mar 30 | Nov 21 |
| 2021 | Apr 3 | Nov 6 | Apr 2 | Dec 20 |
| 2020 | May 9 | Nov 19 | Mar 1 | Dec 16 |
| 2019 | Apr 2 | Nov 9 | Mar 9 | Nov 9 |
| 2018 | Apr 9 | Oct 27 | Mar 21 | Nov 22 |
| 2017 | Mar 24 | Nov 11 | Mar 24 | Nov 11 |
| 2016 | Apr 10 | Nov 23 | Apr 6 | Dec 11 |
| 2015 | Mar 30 | Nov 21 | Mar 30 | Nov 25 |
| 2014 | Apr 17 | Nov 15 | Mar 28 | Nov 18 |
| 2013 | Apr 6 | Nov 4 | Mar 5 | Nov 24 |
| 2012 | Mar 28 | Nov 6 | Mar 7 | none |
| 2011 | Mar 31 | Oct 31 | Mar 29 | Dec 11 |
| 2010 | Mar 28 | Nov 29 | Feb 27 | Dec 8 |
| 2009 | Mar 26 | Nov 7 | Mar 25 | Dec 11 |
| 2008 | Mar 31 | Nov 19 | Mar 30 | Nov 19 |
| 2007 | Apr 12 | Oct 30 | Mar 22 | Nov 24 |
| 2006 | Mar 22 | Dec 3 | Mar 22 | Dec 6 |
| 2005 | Mar 19 | Nov 18 | Mar 15 | Nov 18 |
| 2004 | Apr 7 | Nov 10 | Mar 23 | Nov 26 |
| 2003 | Apr 8 | Nov 9 | Mar 15 | Nov 9 |
| 2002 | Apr 8 | Nov 19 | Mar 24 | Nov 28 |
| 1996 | Apr 18 | no data | Apr 8 | no data |
| 1995 | no data | Nov 5 | no data | Nov 12 |
"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.