Frost history / Rodale Rsch Ctr, PA
Rodale Rsch Ctr, PA: frost dates by year
Last spring and first fall frost at NOAA station USC00367578, 1984 to 2012, measured from daily minimum temperatures.
Elevation 550 ft, 40.551, -75.722. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 30 | Oct 6 |
| Earliest | Apr 6 (2011) | Sep 11 (1994) |
| Latest | May 22 (2002) | Oct 28 (2005) |
| Trend | 3.9 days earlier per decade | 7.1 days later per decade |
| Years with data | 23 | 20 |
At 28°F (hard freeze) the median last spring date is Apr 13 and the median first fall date is Oct 17.
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 |
|---|---|---|---|---|
| 2012 | Apr 30 | no data | Apr 7 | no data |
| 2011 | Apr 6 | Oct 5 | Mar 30 | Oct 29 |
| 2010 | Apr 16 | Oct 21 | Mar 27 | Nov 1 |
| 2009 | May 18 | no data | Apr 13 | no data |
| 2008 | Apr 30 | Oct 6 | Apr 14 | Oct 19 |
| 2007 | Apr 14 | no data | Apr 11 | no data |
| 2006 | Apr 30 | Oct 13 | Mar 24 | Oct 13 |
| 2005 | May 5 | Oct 28 | Apr 17 | Oct 28 |
| 2004 | Apr 17 | Oct 6 | Apr 6 | Nov 9 |
| 2003 | Apr 9 | Oct 3 | Apr 8 | Oct 24 |
| 2002 | May 22 | Oct 22 | Apr 24 | Nov 1 |
| 2001 | Apr 29 | Oct 8 | Apr 19 | Oct 9 |
| 2000 | May 1 | no data | Apr 13 | no data |
| 1999 | Apr 26 | Oct 6 | Mar 26 | Nov 12 |
| 1998 | Apr 29 | Sep 24 | Apr 29 | Nov 3 |
| 1997 | May 8 | Oct 2 | May 8 | Oct 2 |
| 1996 | May 14 | Oct 4 | May 14 | Oct 4 |
| 1995 | Apr 17 | Oct 17 | Apr 8 | Nov 5 |
| 1994 | no data | Sep 11 | no data | Oct 4 |
| 1991 | no data | Sep 28 | no data | Oct 14 |
| 1990 | May 12 | Sep 20 | May 12 | Sep 20 |
| 1989 | May 5 | Sep 25 | Apr 24 | Oct 8 |
| 1988 | no data | Oct 6 | no data | Oct 8 |
| 1987 | May 1 | no data | May 1 | no data |
| 1985 | May 9 | Oct 7 | Apr 11 | Oct 12 |
| 1984 | Apr 22 | no data | Apr 22 | no data |
"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.