Frost history / Diamond M Rch, AZ
Diamond M Rch, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00022527, 1999 to 2018, measured from daily minimum temperatures.
Elevation 5,492 ft, 35.295, -113.367. Download the data (JSON) · NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 19 | Oct 10 |
| Earliest | May 1 (2009) | Sep 10 (2010) |
| Latest | Jun 13 (2017) | Nov 2 (2003) |
| Trend | 8.8 days later per decade | 4.7 days earlier per decade |
| Years with data | 20 | 20 |
At 28°F (hard freeze) the median last spring date is May 8 and the median first fall date is Oct 15.
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 | May 16 | Oct 9 | May 3 | Oct 9 |
| 2017 | Jun 13 | Sep 23 | May 8 | Sep 23 |
| 2016 | May 25 | Oct 4 | Apr 18 | Nov 18 |
| 2015 | May 23 | Oct 27 | May 10 | Nov 4 |
| 2014 | May 22 | Oct 28 | May 7 | Nov 3 |
| 2013 | May 8 | Sep 28 | May 8 | Oct 11 |
| 2012 | May 28 | Oct 13 | May 27 | Oct 25 |
| 2011 | Jun 3 | Oct 7 | May 11 | Oct 7 |
| 2010 | May 29 | Sep 10 | May 25 | Oct 8 |
| 2009 | May 1 | Oct 1 | Apr 29 | Oct 5 |
| 2008 | May 30 | Oct 12 | Apr 23 | Oct 12 |
| 2007 | May 6 | Oct 6 | Apr 20 | Oct 6 |
| 2006 | May 7 | Oct 7 | Apr 25 | Oct 7 |
| 2005 | May 12 | Oct 11 | May 12 | Nov 5 |
| 2004 | Jun 11 | Oct 23 | Apr 19 | Oct 29 |
| 2003 | May 12 | Nov 2 | May 11 | Nov 4 |
| 2002 | May 24 | Oct 3 | May 23 | Oct 31 |
| 2001 | May 5 | Oct 11 | May 4 | Nov 18 |
| 2000 | May 13 | Oct 12 | May 13 | Oct 12 |
| 1999 | May 2 | Oct 17 | Apr 11 | Oct 18 |
"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.