Frost history / Sunbury, PA
Sunbury, PA: frost dates by year
Last spring and first fall frost at NOAA station USC00368668, 1957 to 2025, measured from daily minimum temperatures.
Elevation 575 ft, 40.853, -76.789. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 1 | Oct 14 |
| Earliest | Apr 13 (1970) | Sep 14 (1963) |
| Latest | May 25 (1963) | Nov 18 (1970) |
| Trend | 0.6 days earlier per decade | 1.2 days later per decade |
| Years with data | 36 | 39 |
At 28°F (hard freeze) the median last spring date is Apr 12 and the median first fall date is Oct 27.
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 18 | Oct 10 | Apr 10 | Oct 27 |
| 2024 | Apr 27 | Oct 12 | Apr 22 | Oct 28 |
| 2023 | May 19 | Oct 24 | Apr 11 | Nov 2 |
| 2022 | May 1 | Oct 9 | Apr 19 | Oct 29 |
| 2021 | Apr 24 | Nov 3 | Apr 23 | Nov 3 |
| 2020 | May 21 | Sep 21 | Apr 19 | Nov 17 |
| 2019 | Apr 30 | Oct 19 | Apr 4 | Nov 3 |
| 2018 | Apr 24 | Oct 19 | Apr 21 | Nov 12 |
| 2017 | May 9 | Oct 17 | Apr 9 | Nov 8 |
| 2016 | Apr 24 | Oct 11 | Apr 10 | Oct 26 |
| 2015 | Apr 26 | Oct 19 | Apr 12 | Oct 19 |
| 2014 | Apr 28 | Oct 20 | Apr 18 | Nov 13 |
| 2013 | May 15 | Oct 22 | Apr 5 | Oct 26 |
| 2012 | May 1 | Oct 13 | Apr 13 | Oct 13 |
| 2011 | Apr 22 | Oct 28 | Apr 6 | Oct 30 |
| 2010 | May 12 | Oct 20 | Mar 27 | Oct 23 |
| 2009 | May 20 | Oct 14 | Apr 17 | Oct 19 |
| 2008 | Apr 16 | Oct 7 | Apr 16 | Oct 19 |
| 2007 | May 15 | Oct 29 | Apr 14 | Oct 29 |
| 2006 | Apr 29 | Oct 13 | Apr 11 | Oct 13 |
| 1975 | Apr 29 | Oct 31 | Apr 23 | Nov 16 |
| 1974 | May 9 | Oct 3 | Apr 21 | Oct 4 |
| 1973 | May 16 | Oct 20 | Apr 15 | Nov 8 |
| 1972 | Apr 30 | Oct 11 | Apr 10 | Oct 18 |
| 1971 | May 1 | Nov 5 | Apr 12 | Nov 9 |
| 1970 | Apr 13 | Nov 18 | Apr 12 | Nov 18 |
| 1969 | Apr 25 | Oct 23 | Apr 2 | Oct 23 |
| 1968 | no data | Oct 6 | no data | Oct 31 |
| 1967 | May 13 | Oct 23 | Apr 12 | Oct 29 |
| 1966 | May 12 | Oct 7 | May 11 | Oct 31 |
| 1965 | no data | Oct 6 | no data | Oct 6 |
| 1964 | May 4 | Sep 14 | Apr 10 | Oct 6 |
| 1963 | May 25 | Sep 14 | May 24 | Sep 24 |
| 1962 | May 11 | Sep 21 | May 10 | Oct 25 |
| 1961 | May 5 | Oct 5 | Apr 20 | Oct 28 |
| 1960 | May 3 | Oct 22 | Apr 12 | Oct 26 |
| 1959 | Apr 24 | Oct 20 | Apr 7 | Oct 20 |
| 1958 | May 10 | Oct 2 | Apr 13 | Oct 6 |
| 1957 | no data | Sep 27 | no data | Sep 28 |
"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.