Frost history / Santa Rita Exp Range, AZ
Santa Rita Exp Range, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00027593, 1951 to 2005, measured from daily minimum temperatures.
Elevation 4,300 ft, 31.762, -110.846. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 21 | Nov 21 |
| Earliest | Jan 16 (1992) | Oct 26 (1996) |
| Latest | Apr 30 (1951) | Dec 21 (1995) |
| Trend | 4.3 days earlier per decade | 0.9 days later per decade |
| Years with data | 48 | 42, 1 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 13 and the median first fall date is Dec 3.
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 |
|---|---|---|---|---|
| 2005 | Jan 31 | no data | Jan 13 | no data |
| 2004 | Feb 28 | Nov 29 | Feb 13 | Nov 29 |
| 2003 | Mar 19 | Nov 23 | none | Nov 23 |
| 2002 | Mar 18 | Dec 19 | Feb 1 | Dec 26 |
| 2001 | Apr 10 | Nov 27 | Feb 11 | Nov 29 |
| 2000 | Mar 22 | Nov 7 | none | none |
| 1999 | Apr 5 | Nov 23 | Feb 11 | none |
| 1998 | Apr 2 | Dec 6 | none | Dec 6 |
| 1997 | Apr 4 | Dec 10 | Jan 8 | Dec 10 |
| 1996 | Feb 28 | Oct 26 | Jan 24 | Dec 1 |
| 1995 | Jan 19 | Dec 21 | Jan 18 | none |
| 1994 | Feb 20 | Nov 4 | Feb 1 | Nov 20 |
| 1993 | Feb 2 | Nov 13 | Jan 4 | none |
| 1992 | Jan 16 | Nov 21 | Jan 14 | Nov 21 |
| 1991 | Mar 29 | Oct 31 | Jan 31 | Dec 1 |
| 1990 | Mar 15 | Nov 27 | Mar 14 | Dec 18 |
| 1989 | Mar 5 | Nov 30 | Feb 7 | Dec 12 |
| 1988 | Mar 12 | Nov 19 | Jan 23 | Dec 26 |
| 1987 | Mar 1 | Nov 16 | Jan 22 | Dec 14 |
| 1986 | Feb 12 | Dec 11 | Feb 11 | Dec 11 |
| 1985 | Mar 29 | Nov 14 | Mar 4 | Dec 10 |
| 1984 | Mar 6 | Nov 21 | Jan 20 | Nov 27 |
| 1983 | Apr 13 | Nov 19 | Jan 22 | Nov 22 |
| 1980 | Apr 23 | no data | none | no data |
| 1978 | Apr 9 | Nov 16 | Feb 21 | Dec 3 |
| 1977 | Apr 15 | none | Apr 7 | none |
| 1976 | no data | Nov 6 | no data | Nov 24 |
| 1975 | Apr 10 | no data | Mar 29 | no data |
| 1974 | Mar 10 | Dec 9 | Mar 9 | Dec 17 |
| 1973 | Apr 10 | no data | Mar 15 | no data |
| 1972 | Feb 3 | no data | Jan 31 | no data |
| 1971 | Apr 19 | Oct 30 | Mar 3 | Oct 30 |
| 1970 | Apr 29 | no data | Mar 11 | no data |
| 1969 | no data | Nov 18 | no data | Nov 18 |
| 1968 | Apr 19 | Nov 26 | Jan 6 | Nov 26 |
| 1967 | Apr 13 | Nov 29 | Apr 12 | Dec 10 |
| 1966 | Mar 5 | Nov 27 | Mar 4 | Dec 27 |
| 1965 | Mar 4 | Dec 17 | Feb 15 | Dec 24 |
| 1964 | Apr 3 | Nov 15 | Mar 9 | Nov 18 |
| 1963 | Mar 6 | Nov 21 | Feb 13 | Dec 14 |
| 1962 | Mar 24 | Nov 19 | Mar 14 | none |
| 1961 | Feb 27 | Oct 29 | none | Nov 14 |
| 1960 | Mar 15 | no data | Feb 25 | no data |
| 1959 | no data | Oct 30 | no data | Dec 15 |
| 1957 | Mar 24 | no data | none | no data |
| 1956 | Apr 3 | Nov 3 | Apr 2 | Nov 3 |
| 1955 | Mar 22 | Nov 16 | Mar 21 | none |
| 1954 | Mar 13 | Dec 11 | none | Dec 27 |
| 1953 | Mar 4 | no data | Feb 25 | no data |
| 1952 | Mar 24 | Nov 25 | Mar 23 | Nov 25 |
| 1951 | Apr 30 | Dec 7 | Mar 4 | Dec 7 |
"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.