Frost history / Charleroi Lock 4, PA
Charleroi Lock 4, PA: frost dates by year
Last spring and first fall frost at NOAA station USC00361377, 2011 to 2025, measured from daily minimum temperatures.
Elevation 749 ft, 40.147, -79.899. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 24 | Nov 3 |
| Earliest | Mar 31 (2011) | Oct 19 (2015) |
| Latest | May 15 (2013) | Nov 15 (2022) |
| Trend | 3.0 days earlier per decade | 7.1 days later per decade |
| Years with data | 14 | 15 |
At 28°F (hard freeze) the median last spring date is Apr 2 and the median first fall date is Nov 11.
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 | Nov 7 | Apr 10 | Nov 11 |
| 2024 | Apr 23 | Nov 13 | Mar 25 | Nov 30 |
| 2023 | Apr 10 | Nov 1 | Mar 29 | Nov 2 |
| 2022 | Apr 29 | Nov 15 | Mar 30 | Nov 15 |
| 2021 | Apr 5 | Nov 4 | Apr 5 | Nov 20 |
| 2020 | May 10 | Nov 1 | Mar 9 | Nov 1 |
| 2019 | Apr 3 | Nov 2 | Apr 3 | Nov 8 |
| 2018 | May 1 | Oct 25 | Apr 8 | Nov 11 |
| 2017 | May 10 | Nov 11 | Mar 24 | Nov 11 |
| 2016 | Apr 14 | Nov 12 | Apr 11 | Nov 21 |
| 2015 | Apr 25 | Oct 19 | Apr 2 | Nov 23 |
| 2014 | Apr 25 | Nov 3 | Apr 17 | Nov 15 |
| 2013 | May 15 | Oct 25 | Apr 5 | Nov 9 |
| 2012 | no data | Nov 6 | no data | Nov 8 |
| 2011 | Mar 31 | Oct 30 | Mar 30 | Nov 18 |
"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.