Frost history / Hanover 4 Sw, PA
Hanover 4 Sw, PA: frost dates by year
Last spring and first fall frost at NOAA station USC00363665, 1993 to 2020, measured from daily minimum temperatures.
Elevation 558 ft, 39.771, -77.032. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 22 | Oct 18 |
| Earliest | Mar 28 (2010) | Sep 20 (2020) |
| Latest | May 22 (2002) | Nov 11 (2017) |
| Trend | 5.8 days earlier per decade | 3.5 days later per decade |
| Years with data | 24 | 27 |
At 28°F (hard freeze) the median last spring date is Apr 10 and the median first fall date is Oct 30.
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 |
|---|---|---|---|---|
| 2020 | no data | Sep 20 | no data | Nov 19 |
| 2018 | Apr 21 | Oct 25 | Apr 21 | Nov 11 |
| 2017 | Apr 10 | Nov 11 | Mar 24 | Nov 11 |
| 2016 | Apr 15 | Oct 26 | Apr 11 | Oct 26 |
| 2015 | Apr 25 | Oct 18 | Apr 1 | Oct 19 |
| 2014 | Apr 21 | Nov 3 | Apr 17 | Nov 8 |
| 2013 | May 14 | Oct 24 | Apr 6 | Oct 28 |
| 2012 | Apr 28 | Oct 13 | Mar 11 | Oct 13 |
| 2011 | Apr 6 | Oct 30 | Mar 30 | Oct 30 |
| 2010 | Mar 28 | Oct 30 | Mar 28 | Nov 2 |
| 2009 | Apr 24 | Oct 19 | Apr 13 | Oct 19 |
| 2008 | Apr 16 | Oct 19 | Apr 3 | Oct 20 |
| 2007 | Apr 14 | Oct 29 | Apr 14 | Nov 3 |
| 2006 | Apr 29 | Oct 13 | Apr 10 | Nov 3 |
| 2005 | May 7 | Oct 31 | Apr 16 | Nov 12 |
| 2004 | Apr 16 | Oct 18 | Apr 16 | Nov 9 |
| 2003 | Apr 9 | Oct 3 | Apr 1 | Oct 24 |
| 2002 | May 22 | Oct 15 | Apr 7 | Nov 2 |
| 2001 | Apr 29 | Oct 8 | Apr 19 | Oct 8 |
| 2000 | Apr 14 | Oct 9 | Apr 13 | Oct 9 |
| 1999 | May 1 | Oct 8 | Apr 25 | Oct 28 |
| 1998 | no data | Oct 23 | no data | Oct 30 |
| 1997 | May 8 | Oct 2 | May 8 | Oct 21 |
| 1996 | May 14 | Oct 4 | May 14 | Oct 12 |
| 1995 | May 8 | Oct 17 | Apr 6 | Nov 5 |
| 1994 | Apr 8 | Nov 11 | Apr 8 | Nov 11 |
| 1993 | no data | Oct 11 | no data | Oct 11 |
"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.