Frost history / Union City Filtration Plant, PA
Union City Filtration Plant, PA: frost dates by year
Last spring and first fall frost at NOAA station USC00369042, 2013 to 2025, measured from daily minimum temperatures.
Elevation 1,400 ft, 41.900, -79.861. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 16 | Oct 13 |
| Earliest | Apr 26 (2024) | Sep 19 (2020) |
| Latest | Jun 1 (2025) | Nov 4 (2021) |
| Trend | 5.0 days earlier per decade | 3.2 days earlier per decade |
| Years with data | 13 | 11 |
At 28°F (hard freeze) the median last spring date is Apr 29 and the median first fall date is Nov 2.
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 | Jun 1 | Oct 8 | Apr 18 | Oct 27 |
| 2024 | Apr 26 | Oct 10 | Apr 26 | Oct 17 |
| 2023 | May 26 | Oct 23 | May 18 | Nov 13 |
| 2022 | May 8 | no data | May 8 | no data |
| 2021 | May 14 | Nov 4 | Apr 26 | Nov 6 |
| 2020 | May 14 | Sep 19 | May 13 | Oct 17 |
| 2019 | May 15 | Oct 13 | Apr 29 | Nov 2 |
| 2018 | May 1 | Oct 19 | Apr 30 | Nov 10 |
| 2017 | May 23 | no data | May 15 | no data |
| 2016 | May 16 | Oct 11 | Apr 14 | Nov 12 |
| 2015 | May 23 | Oct 18 | Apr 25 | Oct 19 |
| 2014 | May 18 | Oct 10 | Apr 24 | Nov 3 |
| 2013 | May 26 | Oct 24 | May 14 | Oct 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 1991–2020 frost probabilities.