Frost history / Dateland Whitewing Rch, AZ
Dateland Whitewing Rch, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00022434, 1972 to 2009, measured from daily minimum temperatures.
Elevation 520 ft, 32.971, -113.498. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 10 | Nov 29 |
| Earliest | Jan 3 (1993) | Nov 19 (1994) |
| Latest | Apr 16 (1998) | Dec 27 (1982) |
| Trend | 1.9 days earlier per decade | 0.5 days later per decade |
| Years with data | 24 | 24, 1 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 18 and the median first fall date is Dec 20.
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 |
|---|---|---|---|---|
| 2009 | Feb 15 | no data | none | no data |
| 2008 | Feb 5 | no data | Jan 18 | no data |
| 2007 | no data | Dec 14 | no data | Dec 25 |
| 2004 | no data | Nov 29 | no data | none |
| 1999 | Feb 3 | Nov 25 | none | none |
| 1998 | Apr 16 | Dec 6 | Apr 16 | Dec 6 |
| 1997 | Feb 9 | Dec 13 | none | Dec 13 |
| 1996 | Jan 25 | Dec 4 | Jan 22 | none |
| 1995 | Jan 17 | Dec 15 | none | Dec 22 |
| 1994 | Feb 24 | Nov 19 | Jan 9 | none |
| 1993 | Jan 3 | Nov 26 | none | Dec 21 |
| 1992 | Jan 14 | Nov 24 | none | Dec 20 |
| 1991 | Mar 15 | Nov 29 | Jan 29 | none |
| 1990 | Mar 15 | Nov 27 | Feb 17 | Dec 22 |
| 1989 | Feb 15 | no data | Jan 15 | no data |
| 1986 | Feb 11 | no data | Feb 10 | no data |
| 1984 | Mar 6 | Nov 27 | Jan 18 | none |
| 1983 | Feb 1 | Nov 22 | none | none |
| 1982 | Mar 19 | Dec 27 | Jan 3 | none |
| 1981 | Feb 5 | Dec 23 | none | none |
| 1980 | Feb 11 | Nov 27 | none | none |
| 1979 | Feb 6 | Nov 20 | Jan 1 | Nov 20 |
| 1978 | no data | Dec 3 | no data | Dec 7 |
| 1977 | Mar 19 | none | Jan 12 | none |
| 1976 | Mar 4 | Nov 29 | Jan 3 | Dec 24 |
| 1974 | Jan 30 | Dec 10 | Jan 3 | Dec 24 |
| 1973 | Feb 1 | Dec 4 | Jan 21 | none |
| 1972 | no data | Nov 25 | no data | Dec 12 |
"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.