Swan Lake, NE: frost dates by year

Last spring and first fall frost at NOAA station USC00258360, 1999 to 2012, measured from daily minimum temperatures.

Elevation 2,330 ft, 42.184, -99.090. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 12	Sep 29
Earliest	Apr 10 (2003)	Sep 9 (2012)
Latest	May 20 (2002)	Oct 26 (2007)
Trend	10.0 days later per decade	1.1 days later per decade
Years with data	12	13

At 28°F (hard freeze) the median last spring date is Apr 20 and the median first fall date is Oct 5.

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
2012	no data	Sep 9	no data	Oct 2
2010	May 9	Oct 4	Apr 18	Oct 17
2009	May 16	Sep 29	Apr 11	Oct 5
2008	May 12	Oct 14	Apr 29	Oct 14
2007	Apr 15	Oct 26	Apr 10	Oct 31
2006	May 12	Sep 19	Apr 27	Oct 12
2005	May 15	Sep 29	May 4	Oct 7
2004	May 15	Oct 2	May 15	Oct 2
2003	Apr 10	Sep 19	Apr 10	Sep 25
2002	May 20	Sep 23	May 20	Sep 27
2001	Apr 24	Oct 6	Apr 18	Oct 6
2000	May 14	Sep 21	Apr 22	Sep 25
1999	Apr 19	Sep 29	Apr 18	Sep 29

"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.