Hamburg, PA: frost dates by year

Last spring and first fall frost at NOAA station USC00363632, 1979 to 2021, measured from daily minimum temperatures.

Elevation 369 ft, 40.552, -75.991. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 18	Oct 25
Earliest	Mar 28 (2010)	Oct 10 (1979)
Latest	May 10 (2020)	Nov 9 (2017)
Trend	little change (less than half a day per decade)	3.6 days later per decade
Years with data	14	14

At 28°F (hard freeze) the median last spring date is Apr 2 and the median first fall date is Nov 8.

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
2021	Apr 22	no data	Apr 3	no data
2020	May 10	Oct 31	Apr 19	Nov 19
2019	Apr 3	Nov 2	Apr 2	Nov 9
2018	Apr 21	Oct 26	Apr 11	Nov 11
2017	Apr 9	Nov 9	Mar 24	Nov 11
2016	Apr 11	Oct 26	Apr 10	Nov 13
2015	Apr 25	Oct 19	Apr 2	Oct 19
2014	Apr 17	Oct 31	Apr 17	Nov 15
2013	Apr 5	Oct 25	Apr 4	Oct 26
2012	Apr 28	Oct 13	Mar 12	Nov 6
2011	Apr 6	Oct 30	Mar 30	Oct 31
2010	Mar 28	Oct 23	Mar 28	Nov 2
1981	Apr 22	Oct 13	Apr 22	Oct 20
1980	Apr 18	Oct 23	Mar 19	Oct 23
1979	no data	Oct 10	no data	Nov 17

"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.