Wittmann 1SE, AZ: frost dates by year

Last spring and first fall frost at NOAA station USC00029464, 1962 to 2019, measured from daily minimum temperatures.

Elevation 1,683 ft, 33.778, -112.523. Download the data (JSON) · NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 25	Dec 4
Earliest	Jan 4 (2015)	Oct 30 (2019)
Latest	Mar 17 (2002)	Dec 29 (1962)
Trend	4.7 days earlier per decade	0.8 days earlier per decade
Years with data	23	21

At 28°F (hard freeze) the median last spring date is Feb 4 and the median first fall date is Dec 16.

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
2019	Mar 14	Oct 30	Feb 23	Dec 29
2018	Feb 26	Dec 3	Jan 22	Dec 29
2017	Feb 25	Dec 22	Jan 26	Dec 22
2016	Feb 6	Dec 18	Feb 4	Dec 18
2015	Jan 4	Nov 30	Jan 3	Nov 30
2014	Feb 4	Dec 24	none	Dec 26
2013	Feb 27	Dec 6	Jan 15	Dec 6
2012	Feb 28	Dec 20	none	none
2011	Feb 10	Dec 4	Feb 4	Dec 6
2010	Feb 23	Nov 24	none	Dec 31
2009	Feb 13	no data	none	no data
2008	Feb 6	Dec 27	Jan 21	none
2007	Jan 22	Dec 14	Jan 17	Dec 15
2006	Mar 13	Nov 30	Jan 17	Nov 30
2005	Jan 13	Nov 28	none	Dec 16
2004	Feb 15	Nov 30	Feb 13	Nov 30
2003	Feb 9	Nov 23	none	Nov 23
2002	Mar 17	Dec 20	Mar 3	Dec 20
2001	no data	Nov 27	no data	Dec 16
1966	Mar 5	no data	Mar 5	no data
1965	Mar 6	Dec 15	Mar 4	none
1964	Mar 10	Nov 16	Feb 16	Nov 17
1963	Mar 16	no data	Mar 4	no data
1962	Mar 15	Dec 29	Feb 28	none

"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 1991–2020 frost probabilities.