Ripon 5 Ne, WI: frost dates by year

Last spring and first fall frost at NOAA station USC00477209, 2002 to 2014, measured from daily minimum temperatures.

Elevation 930 ft, 43.886, -88.744. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 2	Oct 8
Earliest	Apr 10 (2006)	Sep 15 (2007)
Latest	May 15 (2013)	Oct 22 (2014)
Trend	6.0 days later per decade	11.0 days later per decade
Years with data	10	11

At 28°F (hard freeze) the median last spring date is Apr 14 and the median first fall date is Oct 22.

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
2014	Apr 26	Oct 22	Apr 16	Oct 22
2013	May 15	Oct 22	Apr 21	Oct 22
2012	no data	Oct 8	no data	Oct 12
2010	May 11	Oct 5	May 11	Oct 29
2009	Apr 23	no data	Apr 13	no data
2008	May 1	Oct 21	Apr 15	Oct 29
2007	Apr 17	Sep 15	Apr 14	Nov 7
2006	Apr 10	Oct 12	Apr 9	Oct 12
2005	May 5	Oct 22	Mar 27	Nov 10
2004	May 4	Oct 2	May 3	Nov 8
2003	May 3	Oct 2	Apr 9	Oct 2
2002	no data	Oct 7	no data	Oct 16

"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.