Hingham Wwtp, WI: frost dates by year

Last spring and first fall frost at NOAA station USC00473661, 2002 to 2021, measured from daily minimum temperatures.

Elevation 763 ft, 43.641, -87.910. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 10	Oct 17
Earliest	Apr 17 (2007)	Oct 2 (2003)
Latest	May 29 (2008)	Oct 28 (2008)
Trend	2.1 days earlier per decade	2.5 days later per decade
Years with data	19	18

At 28°F (hard freeze) the median last spring date is Apr 22 and the median first fall date is Oct 21.

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	May 12	no data	Apr 22	no data
2020	May 13	Oct 17	May 9	Oct 19
2018	Apr 29	Oct 12	Apr 28	Oct 17
2017	May 8	Oct 26	Apr 1	Nov 1
2016	May 16	Oct 14	Apr 12	Nov 12
2015	May 20	Oct 17	Apr 24	Oct 17
2014	Apr 23	Oct 19	Apr 23	Nov 2
2013	May 13	Oct 20	Apr 21	Oct 23
2012	Apr 30	Oct 7	Apr 27	Oct 12
2011	Apr 21	Oct 22	Apr 21	Oct 28
2010	May 10	Oct 22	Apr 9	Oct 29
2009	Apr 23	Oct 11	Apr 23	Oct 11
2008	May 29	Oct 28	Apr 14	Oct 29
2007	Apr 17	Oct 28	Apr 15	Nov 2
2006	May 22	Oct 12	Apr 9	Oct 12
2005	May 4	Oct 28	Apr 15	Oct 28
2004	May 3	Oct 5	May 3	Oct 5
2003	May 22	Oct 2	May 4	Oct 2
2002	May 21	Oct 14	May 4	Oct 14

"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.