Frost history / Tucson Wfo, AZ
Tucson Wfo, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00028815, 1951 to 2007, measured from daily minimum temperatures.
Elevation 2,435 ft, 32.229, -110.954. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 17 | Dec 1 |
| Earliest | Jan 7 (1961) | Oct 30 (1971) |
| Latest | Apr 12 (1967) | Dec 30 (1969) |
| Trend | 8.2 days earlier per decade | 3.7 days later per decade |
| Years with data | 55, 11 with no freeze | 55, 8 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 16 and the median first fall date is Dec 17.
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 |
|---|---|---|---|---|
| 2007 | no data | Dec 22 | no data | Dec 28 |
| 2006 | Jan 22 | Nov 30 | none | none |
| 2005 | none | Nov 28 | none | none |
| 2004 | Feb 13 | Nov 30 | none | none |
| 2003 | none | Dec 28 | none | Dec 28 |
| 2002 | Mar 3 | Dec 26 | none | none |
| 2001 | Feb 18 | Dec 13 | none | none |
| 2000 | Jan 10 | none | none | none |
| 1999 | Feb 11 | Dec 4 | none | none |
| 1998 | Feb 16 | Dec 7 | none | Dec 24 |
| 1996 | Jan 24 | Dec 1 | none | none |
| 1995 | none | none | none | none |
| 1994 | none | none | none | none |
| 1993 | none | none | none | none |
| 1992 | Jan 15 | Nov 25 | none | none |
| 1991 | Jan 30 | Dec 2 | none | none |
| 1990 | Feb 16 | Dec 18 | Feb 16 | Dec 24 |
| 1989 | Jan 16 | Dec 12 | Jan 9 | none |
| 1988 | Jan 21 | Dec 27 | none | Dec 28 |
| 1987 | Jan 22 | Dec 15 | Jan 18 | Dec 27 |
| 1986 | none | none | none | none |
| 1985 | Feb 2 | none | Feb 1 | none |
| 1984 | Jan 20 | Nov 27 | none | none |
| 1983 | none | Nov 28 | none | none |
| 1982 | none | Dec 25 | none | none |
| 1981 | none | Dec 24 | none | none |
| 1980 | none | none | none | none |
| 1979 | Jan 31 | Nov 21 | Jan 30 | none |
| 1978 | Feb 19 | Dec 4 | none | Dec 7 |
| 1977 | Feb 26 | none | none | none |
| 1976 | Jan 7 | Nov 28 | Jan 3 | Nov 29 |
| 1975 | Feb 23 | Nov 30 | none | none |
| 1974 | Feb 7 | Dec 24 | none | Dec 24 |
| 1973 | Jan 24 | Dec 25 | none | none |
| 1972 | Feb 3 | Dec 12 | Feb 3 | none |
| 1971 | Mar 3 | Oct 30 | Mar 2 | none |
| 1970 | Feb 3 | Dec 11 | Jan 6 | none |
| 1969 | Mar 15 | Dec 30 | Feb 1 | Dec 31 |
| 1968 | none | Nov 26 | none | Dec 18 |
| 1967 | Apr 12 | Dec 2 | Jan 19 | none |
| 1966 | Mar 5 | Nov 27 | Mar 5 | Nov 27 |
| 1965 | Mar 6 | no data | Mar 5 | no data |
| 1964 | Mar 11 | Nov 16 | Mar 9 | Nov 21 |
| 1963 | Mar 19 | Dec 8 | Mar 5 | Dec 13 |
| 1962 | Mar 15 | Nov 18 | Mar 14 | none |
| 1961 | Jan 7 | Nov 22 | none | none |
| 1960 | Feb 25 | Nov 28 | Feb 25 | Dec 6 |
| 1959 | Mar 6 | Dec 15 | Jan 21 | Dec 28 |
| 1958 | Feb 28 | Nov 16 | Jan 23 | Nov 17 |
| 1957 | Feb 1 | Nov 23 | none | Dec 3 |
| 1956 | Mar 16 | Nov 2 | Feb 5 | Nov 4 |
| 1955 | Mar 22 | Nov 16 | Mar 22 | none |
| 1954 | Mar 14 | Nov 18 | Mar 13 | Dec 17 |
| 1953 | Mar 4 | Nov 19 | Feb 25 | Nov 19 |
| 1952 | Mar 22 | Nov 25 | Feb 20 | Nov 26 |
| 1951 | Mar 19 | Dec 8 | Mar 4 | Dec 21 |
"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.