Frost history / Middletown Harrisburg Intl Ap, PA
Middletown Harrisburg Intl Ap, PA: frost dates by year
Last spring and first fall frost at NOAA station USW00014711, 1951 to 2024, measured from daily minimum temperatures.
Elevation 312 ft, 40.194, -76.763. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 10 | Nov 2 |
| Earliest | Mar 22 (2005) | Oct 6 (1958) |
| Latest | May 10 (2020) | Nov 18 (2020) |
| Trend | little change (less than half a day per decade) | 1.8 days later per decade |
| Years with data | 48 | 48 |
At 28°F (hard freeze) the median last spring date is Mar 27 and the median first fall date is Nov 10.
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 |
|---|---|---|---|---|
| 2024 | Mar 26 | Nov 13 | Mar 22 | Nov 30 |
| 2023 | Apr 9 | Nov 2 | Mar 21 | Nov 25 |
| 2022 | Apr 11 | Nov 14 | Mar 30 | Nov 15 |
| 2021 | Apr 23 | Nov 4 | Mar 21 | Nov 20 |
| 2020 | May 10 | Nov 18 | Mar 8 | Dec 7 |
| 2019 | Apr 3 | Nov 8 | Mar 27 | Nov 8 |
| 2018 | Apr 21 | Nov 10 | Apr 11 | Nov 22 |
| 2017 | Mar 23 | Nov 10 | Mar 23 | Nov 10 |
| 2016 | Apr 10 | Nov 12 | Apr 6 | Nov 13 |
| 2015 | Apr 25 | Oct 19 | Mar 29 | Nov 23 |
| 2014 | Apr 16 | Nov 8 | Mar 27 | Nov 15 |
| 2013 | Apr 21 | Oct 26 | Apr 4 | Nov 4 |
| 2012 | Mar 30 | Oct 13 | Mar 11 | Nov 22 |
| 2011 | Apr 2 | Oct 29 | Mar 30 | Nov 6 |
| 2010 | Mar 27 | Nov 2 | Mar 27 | Nov 28 |
| 2009 | Apr 13 | Nov 4 | Mar 25 | Nov 7 |
| 2008 | Apr 3 | Oct 23 | Apr 3 | Nov 18 |
| 2007 | Apr 11 | Nov 8 | Mar 21 | Nov 8 |
| 2006 | Apr 10 | Oct 15 | Mar 21 | Dec 3 |
| 2005 | Mar 22 | Nov 12 | Mar 18 | Nov 18 |
| 2004 | Apr 16 | Nov 9 | Mar 24 | Nov 10 |
| 2003 | Apr 8 | Nov 8 | Apr 1 | Nov 9 |
| 2002 | Apr 7 | Oct 31 | Apr 7 | Nov 20 |
| 2001 | Apr 29 | Oct 9 | Apr 3 | Oct 29 |
| 2000 | Apr 13 | Nov 16 | Mar 18 | Nov 16 |
| 1999 | Mar 27 | Nov 5 | Mar 26 | Nov 18 |
| 1998 | Mar 25 | Nov 3 | Mar 25 | Nov 5 |
| 1997 | Apr 15 | Oct 23 | Mar 24 | Nov 13 |
| 1996 | Apr 18 | Nov 3 | Mar 22 | Nov 4 |
| 1995 | Apr 5 | Nov 5 | Apr 5 | Nov 6 |
| 1994 | Apr 8 | Nov 12 | Mar 31 | Nov 24 |
| 1993 | Apr 7 | Oct 11 | Mar 20 | Nov 7 |
| 1992 | Apr 13 | Oct 20 | Apr 4 | Oct 20 |
| 1965 | Apr 5 | Oct 29 | Apr 1 | Oct 29 |
| 1964 | Apr 10 | Oct 12 | Apr 5 | Nov 21 |
| 1963 | Apr 6 | Nov 13 | Mar 11 | Dec 6 |
| 1962 | Apr 17 | Oct 25 | Apr 4 | Nov 7 |
| 1961 | Apr 20 | Oct 28 | Mar 21 | Nov 10 |
| 1960 | Apr 11 | Oct 26 | Mar 27 | Nov 7 |
| 1959 | Apr 13 | Oct 29 | Mar 29 | Nov 8 |
| 1958 | Apr 9 | Oct 6 | Apr 9 | Nov 23 |
| 1957 | May 4 | Oct 26 | Apr 11 | Nov 11 |
| 1956 | Apr 25 | Nov 10 | Apr 21 | Nov 10 |
| 1955 | Apr 8 | Nov 8 | Mar 31 | Nov 9 |
| 1954 | Apr 4 | Oct 8 | Apr 4 | Nov 6 |
| 1953 | Apr 22 | Oct 8 | Mar 21 | Nov 6 |
| 1952 | Apr 9 | Oct 21 | Mar 18 | Oct 26 |
| 1951 | Mar 27 | Nov 3 | Mar 27 | Nov 3 |
"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.