Arizona City, AZ: frost dates by year

Last spring and first fall frost at NOAA station USC00020404, 2002 to 2018, measured from daily minimum temperatures.

Elevation 1,525 ft, 32.731, -111.692. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Feb 20	Nov 26
Earliest	Jan 16 (2005)	Oct 29 (2009)
Latest	Mar 20 (2012)	Dec 20 (2008)
Trend	6.7 days later per decade	9.2 days earlier per decade
Years with data	13	14

At 28°F (hard freeze) the median last spring date is Feb 2 and the median first fall date is Dec 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
2018	Mar 1	no data	Feb 27	no data
2017	Feb 26	Dec 8	Jan 29	Dec 22
2016	Feb 7	Nov 30	Feb 6	Nov 30
2015	Jan 25	Nov 11	Jan 25	Nov 27
2014	Feb 3	Nov 17	Jan 16	Nov 24
2013	Mar 2	Dec 6	Feb 27	Dec 6
2012	Mar 20	Nov 11	Jan 15	Dec 11
2011	no data	Nov 8	no data	Dec 6
2010	no data	Nov 13	no data	Nov 26
2009	Feb 20	Oct 29	Jan 30	Dec 5
2008	Feb 7	Dec 20	Feb 2	Dec 21
2007	Mar 4	Nov 24	Mar 1	Dec 16
2006	Feb 22	Nov 30	Feb 7	Nov 30
2005	Jan 16	Nov 28	none	Nov 28
2003	Feb 10	no data	none	no data
2002	no data	Dec 19	no data	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 to 2020 frost probabilities.