Frost history / Williams 35 Nnw, AZ
Williams 35 Nnw, AZ: frost dates by year
Last spring and first fall frost at NOAA station USW00053155, 2008 to 2024, measured from daily minimum temperatures.
Elevation 5,990 ft, 35.755, -112.338. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 13 | Oct 15 |
| Earliest | Apr 26 (2016) | Sep 23 (2017) |
| Latest | May 30 (2011) | Nov 2 (2014) |
| Trend | 2.5 days earlier per decade | 5.1 days later per decade |
| Years with data | 16 | 17 |
At 28°F (hard freeze) the median last spring date is Apr 30 and the median first fall date is Oct 27.
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 |
|---|---|---|---|---|
| 2024 | May 6 | Oct 18 | May 6 | Oct 30 |
| 2023 | May 6 | Oct 29 | Apr 21 | Oct 29 |
| 2022 | May 13 | Oct 23 | May 12 | Oct 23 |
| 2021 | May 24 | Oct 12 | May 23 | Oct 13 |
| 2020 | May 20 | Oct 26 | May 20 | Oct 26 |
| 2019 | May 27 | Oct 10 | Apr 13 | Oct 19 |
| 2018 | May 3 | Oct 15 | Apr 21 | Nov 1 |
| 2017 | May 19 | Sep 23 | May 19 | Nov 8 |
| 2016 | Apr 26 | Oct 4 | Apr 2 | Nov 17 |
| 2015 | May 10 | Oct 31 | Apr 27 | Nov 5 |
| 2014 | May 13 | Nov 2 | May 7 | Nov 3 |
| 2013 | May 8 | Oct 4 | Apr 19 | Oct 14 |
| 2012 | May 27 | Oct 25 | Apr 14 | Oct 25 |
| 2011 | May 30 | Oct 7 | May 10 | Oct 27 |
| 2010 | May 25 | Oct 26 | May 3 | Oct 27 |
| 2009 | Apr 27 | Oct 1 | Apr 26 | Oct 8 |
| 2008 | no data | Oct 11 | no data | Oct 11 |
"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.