Frost history / South Phoenix, AZ
South Phoenix, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00028112, 1961 to 2006, measured from daily minimum temperatures.
Elevation 1,155 ft, 33.381, -112.070. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 10 | Nov 30 |
| Earliest | Jan 4 (1993) | Oct 30 (1971) |
| Latest | Mar 29 (1975) | Dec 30 (1970) |
| Trend | 8.6 days earlier per decade | 1.5 days later per decade |
| Years with data | 45, 2 with no freeze | 43, 3 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 30 and the median first fall date is Dec 18.
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 |
|---|---|---|---|---|
| 2006 | Jan 22 | Nov 30 | none | none |
| 2005 | none | Dec 6 | none | Dec 17 |
| 2004 | Feb 13 | Nov 30 | Jan 5 | none |
| 2003 | none | Dec 16 | none | Dec 28 |
| 2002 | Mar 3 | none | none | none |
| 2001 | Feb 9 | Dec 13 | none | none |
| 2000 | Jan 9 | Nov 16 | none | none |
| 1999 | Feb 11 | Dec 9 | none | none |
| 1998 | Jan 22 | Dec 6 | none | Dec 23 |
| 1997 | Feb 7 | Dec 12 | Jan 8 | Dec 25 |
| 1996 | Jan 25 | Dec 1 | Jan 25 | Dec 18 |
| 1995 | Jan 19 | Dec 22 | none | none |
| 1994 | Feb 24 | Nov 20 | Jan 11 | none |
| 1993 | Jan 4 | Nov 27 | none | Dec 22 |
| 1992 | Jan 15 | Nov 25 | none | none |
| 1991 | Jan 31 | Nov 29 | none | none |
| 1990 | Feb 17 | Dec 18 | Feb 16 | Dec 23 |
| 1989 | Feb 7 | Dec 12 | Feb 7 | Dec 13 |
| 1988 | Mar 12 | Dec 26 | Jan 20 | Dec 27 |
| 1987 | Jan 24 | Dec 14 | Jan 22 | Dec 14 |
| 1986 | Feb 11 | none | Feb 7 | none |
| 1985 | Mar 5 | Nov 15 | Feb 6 | none |
| 1984 | Feb 18 | Nov 27 | Jan 20 | none |
| 1983 | Jan 21 | Nov 26 | Jan 21 | none |
| 1982 | Feb 4 | Dec 25 | none | none |
| 1981 | Feb 6 | Nov 26 | Feb 4 | Dec 24 |
| 1980 | Feb 10 | Nov 27 | none | none |
| 1979 | Feb 7 | Nov 20 | Jan 31 | none |
| 1978 | Jan 26 | Dec 7 | none | Dec 7 |
| 1977 | Feb 26 | none | none | none |
| 1975 | Mar 29 | Nov 30 | Feb 23 | none |
| 1974 | Feb 8 | Dec 11 | Jan 4 | Dec 24 |
| 1973 | Jan 23 | Nov 17 | none | none |
| 1972 | Mar 29 | no data | Jan 6 | no data |
| 1971 | Mar 3 | Oct 30 | Mar 3 | Dec 9 |
| 1970 | Feb 3 | Dec 30 | Jan 29 | none |
| 1969 | Mar 6 | Dec 6 | Feb 2 | Dec 30 |
| 1968 | Jan 6 | Nov 28 | Jan 2 | Dec 18 |
| 1967 | Mar 8 | Dec 10 | Feb 18 | Dec 10 |
| 1966 | Mar 5 | Nov 26 | Mar 4 | Dec 10 |
| 1965 | Mar 5 | Dec 19 | Mar 4 | none |
| 1964 | Mar 25 | no data | Mar 9 | no data |
| 1963 | Mar 19 | Dec 10 | Jan 27 | Dec 11 |
| 1962 | Mar 19 | Nov 18 | Mar 15 | none |
| 1961 | Feb 25 | Nov 15 | Jan 14 | Nov 19 |
"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.