Frost history / Clarence, PA
Clarence, PA: frost dates by year
Last spring and first fall frost at NOAA station USC00361480, 2008 to 2019, measured from daily minimum temperatures.
Elevation 1,390 ft, 41.049, -77.941. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 20 | Sep 20 |
| Earliest | Apr 23 (2011) | Sep 6 (2013) |
| Latest | Jun 5 (2019) | Oct 16 (2018) |
| Trend | 2.8 days later per decade | 27.4 days later per decade |
| Years with data | 11 | 11 |
At 28°F (hard freeze) the median last spring date is May 10 and the median first fall date is Oct 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 |
|---|---|---|---|---|
| 2019 | Jun 5 | no data | Apr 30 | no data |
| 2018 | May 2 | Oct 16 | May 2 | Oct 19 |
| 2017 | May 10 | Oct 1 | May 10 | Oct 1 |
| 2016 | May 21 | Sep 26 | May 17 | Oct 11 |
| 2015 | May 25 | Oct 11 | May 24 | Oct 19 |
| 2014 | May 20 | Oct 5 | Apr 29 | Oct 10 |
| 2013 | May 28 | Sep 6 | May 15 | Sep 19 |
| 2012 | May 17 | Sep 20 | May 1 | Sep 25 |
| 2011 | Apr 23 | Sep 16 | Apr 22 | Oct 23 |
| 2010 | May 12 | Sep 7 | May 12 | Oct 13 |
| 2009 | Jun 2 | Sep 20 | May 24 | Oct 12 |
| 2008 | no data | Sep 19 | no data | Oct 7 |
"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.