Dehart Dam, PA: frost dates by year

Last spring and first fall frost at NOAA station USC00362071, 1999 to 2018, measured from daily minimum temperatures.

Elevation 537 ft, 40.461, -76.749. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 30	Oct 18
Earliest	Apr 15 (2000)	Sep 22 (1999)
Latest	May 23 (2002)	Oct 29 (2007)
Trend	2.9 days later per decade	7.2 days later per decade
Years with data	19	20

At 28°F (hard freeze) the median last spring date is Apr 14 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
2018	May 2	Oct 19	Apr 22	Nov 11
2017	May 10	Oct 18	Apr 9	Nov 11
2016	Apr 24	Oct 26	Apr 14	Oct 26
2015	Apr 27	Oct 18	Apr 27	Oct 19
2014	Apr 28	Oct 5	Apr 17	Nov 8
2013	May 14	Oct 23	May 14	Oct 26
2012	Apr 30	Oct 13	Apr 28	Oct 13
2011	Apr 22	Oct 28	Apr 6	Oct 30
2010	May 11	Oct 23	Apr 28	Nov 2
2009	May 19	Oct 14	Apr 13	Oct 19
2008	Apr 30	Oct 7	Apr 17	Oct 20
2007	May 15	Oct 29	Apr 14	Nov 8
2006	Apr 29	Oct 13	Apr 10	Oct 13
2005	May 6	Oct 29	Mar 19	Nov 13
2004	Apr 17	Oct 18	Apr 6	Nov 10
2003	Apr 15	Oct 3	Apr 2	Nov 9
2002	May 23	Oct 19	Apr 7	Nov 8
2001	Apr 29	Oct 8	Apr 20	Oct 9
2000	Apr 15	Oct 8	Apr 14	Oct 9
1999	no data	Sep 22	no data	Nov 4

"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.