Frost history / Stewart Mtn Dam, AZ
Stewart Mtn Dam, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00028214, 1961 to 2008, measured from daily minimum temperatures.
Elevation 1,422 ft, 33.557, -111.536. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 27 | Nov 27 |
| Earliest | Jan 4 (1993) | Nov 7 (1986) |
| Latest | Apr 15 (1970) | Dec 27 (2008) |
| Trend | 4.2 days earlier per decade | 2.1 days later per decade |
| Years with data | 43, 1 with no freeze | 40, 1 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 6 and the median first fall date is Dec 12.
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 |
|---|---|---|---|---|
| 2008 | no data | Dec 27 | no data | none |
| 2007 | Mar 1 | Dec 22 | Jan 16 | Dec 22 |
| 2006 | Feb 23 | no data | Jan 24 | no data |
| 2005 | none | Nov 29 | none | Dec 6 |
| 2004 | Feb 17 | Nov 29 | Feb 13 | Nov 30 |
| 2003 | Apr 4 | Nov 23 | Feb 6 | Dec 16 |
| 2002 | Mar 15 | Dec 19 | Mar 4 | none |
| 2001 | Feb 12 | Nov 27 | none | Nov 27 |
| 2000 | Jan 12 | Nov 15 | Jan 9 | none |
| 1999 | Jan 6 | Nov 21 | none | none |
| 1998 | Jan 9 | Dec 8 | none | Dec 28 |
| 1997 | Feb 24 | Dec 13 | Jan 9 | none |
| 1994 | Feb 12 | no data | Jan 10 | no data |
| 1993 | Jan 4 | Dec 6 | none | Dec 17 |
| 1992 | Jan 15 | Nov 21 | none | Nov 25 |
| 1991 | Mar 28 | Nov 16 | Jan 31 | Dec 2 |
| 1990 | Mar 14 | Nov 27 | Feb 17 | Dec 18 |
| 1989 | Mar 5 | Nov 28 | Feb 7 | Dec 11 |
| 1988 | Mar 17 | Nov 16 | Mar 15 | Nov 16 |
| 1987 | Mar 27 | Nov 15 | Feb 27 | Nov 15 |
| 1986 | Feb 12 | Nov 7 | Feb 12 | Dec 10 |
| 1985 | Mar 5 | no data | Feb 6 | no data |
| 1984 | Jan 20 | Nov 26 | none | Dec 15 |
| 1983 | Jan 22 | Nov 27 | Jan 22 | none |
| 1982 | Feb 4 | Dec 25 | Feb 4 | none |
| 1981 | Feb 5 | no data | none | no data |
| 1980 | Jan 24 | Nov 22 | none | none |
| 1979 | Feb 5 | Nov 19 | Jan 30 | Nov 21 |
| 1978 | no data | Dec 2 | no data | Dec 6 |
| 1977 | Mar 3 | Dec 20 | Feb 26 | none |
| 1976 | Mar 5 | Dec 8 | Jan 5 | Dec 27 |
| 1975 | Mar 29 | Nov 20 | Feb 22 | none |
| 1974 | Mar 5 | Nov 27 | Feb 25 | Dec 10 |
| 1973 | Jan 28 | no data | Jan 23 | no data |
| 1972 | Feb 15 | Dec 6 | Feb 3 | Dec 12 |
| 1971 | Mar 3 | no data | Mar 3 | no data |
| 1970 | Apr 15 | Nov 19 | Feb 3 | Dec 15 |
| 1969 | Mar 16 | Nov 18 | Feb 3 | Dec 31 |
| 1968 | Jan 7 | Nov 28 | Jan 6 | Dec 4 |
| 1967 | Feb 19 | Dec 3 | Feb 18 | none |
| 1966 | Mar 5 | Nov 27 | Mar 4 | Dec 27 |
| 1965 | Mar 6 | Dec 16 | Mar 5 | none |
| 1964 | Mar 9 | Nov 17 | Feb 27 | Dec 16 |
| 1963 | Mar 16 | Nov 21 | Jan 22 | Dec 14 |
| 1962 | Mar 16 | none | Mar 14 | none |
| 1961 | no data | Nov 18 | 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.