Oswayo 1 Ene, PA: frost dates by year

Last spring and first fall frost at NOAA station USC00366649, 2006 to 2020, measured from daily minimum temperatures.

Elevation 1,710 ft, 41.924, -78.007. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 22	Sep 21
Earliest	Apr 30 (2019)	Sep 6 (2013)
Latest	Jun 10 (2016)	Oct 14 (2018)
Trend	13.1 days earlier per decade	4.1 days later per decade
Years with data	13	14

At 28°F (hard freeze) the median last spring date is May 14 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
2020	no data	Sep 16	no data	Oct 17
2019	Apr 30	no data	Apr 29	no data
2018	May 8	Oct 14	May 2	Oct 19
2017	May 16	Oct 1	May 16	Oct 1
2016	Jun 10	Sep 25	May 16	Oct 11
2015	May 24	Sep 21	May 23	Oct 17
2014	May 19	Sep 23	May 7	Oct 10
2013	May 28	Sep 6	May 27	Oct 21
2012	May 17	Sep 15	May 12	Oct 9
2011	Jun 4	Oct 6	May 7	Oct 28
2010	May 12	Sep 21	May 11	Oct 10
2009	Jun 1	Sep 20	May 19	Oct 12
2008	May 30	Sep 19	May 20	Oct 4
2007	May 22	Sep 17	May 14	Oct 29
2006	no data	Sep 30	no data	Oct 1

"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.