S Mtn, PA: frost dates by year

Last spring and first fall frost at NOAA station USC00368308, 2006 to 2022, measured from daily minimum temperatures.

Elevation 1,520 ft, 39.851, -77.504. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 29	Oct 20
Earliest	Apr 6 (2011)	Oct 13 (2006)
Latest	May 14 (2013)	Oct 31 (2020)
Trend	2.6 days later per decade	2.8 days later per decade
Years with data	15	14

At 28°F (hard freeze) the median last spring date is Apr 16 and the median first fall date is Oct 31.

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
2022	Apr 28	no data	Apr 28	no data
2020	May 10	Oct 31	May 10	Nov 19
2019	Apr 29	no data	Apr 3	no data
2018	Apr 22	Oct 22	Apr 21	Nov 11
2017	May 9	Oct 17	Mar 31	Nov 10
2016	Apr 15	Oct 15	Apr 14	Oct 26
2015	Apr 25	Oct 18	Apr 25	Oct 18
2014	Apr 27	Oct 31	Apr 17	Nov 8
2013	May 14	Oct 23	May 14	Oct 26
2012	Apr 29	Oct 13	Apr 14	Nov 6
2011	Apr 6	Oct 28	Apr 6	Oct 29
2010	May 10	Oct 30	Mar 28	Nov 1
2009	no data	Oct 14	no data	Oct 19
2008	Apr 30	Oct 18	Apr 16	Oct 20
2007	Apr 20	Oct 29	Apr 16	Oct 29
2006	Apr 30	Oct 13	Apr 10	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.