Frost history / Tucson U Of A #1, AZ
Tucson U Of A #1, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00028817, 1982 to 2012, measured from daily minimum temperatures.
Elevation 2,315 ft, 32.258, -111.005. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 1 | Nov 28 |
| Earliest | Jan 15 (2005) | Nov 14 (1985) |
| Latest | Apr 14 (1983) | Dec 19 (2008) |
| Trend | 6.0 days earlier per decade | 4.3 days later per decade |
| Years with data | 28, 1 with no freeze | 28 |
At 28°F (hard freeze) the median last spring date is Jan 28 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 |
|---|---|---|---|---|
| 2012 | Mar 22 | no data | Jan 13 | no data |
| 2011 | Feb 28 | Dec 5 | Feb 28 | Dec 6 |
| 2010 | no data | Nov 26 | no data | Nov 26 |
| 2008 | Mar 6 | Dec 19 | Jan 20 | Dec 28 |
| 2007 | Mar 3 | Dec 15 | Jan 24 | Dec 22 |
| 2006 | Mar 13 | no data | Jan 22 | no data |
| 2005 | Jan 15 | Nov 28 | none | Nov 28 |
| 2004 | Feb 14 | Nov 29 | Feb 13 | Nov 29 |
| 2003 | Feb 10 | Nov 23 | none | Nov 23 |
| 2002 | Mar 4 | Dec 19 | Mar 4 | Dec 26 |
| 2001 | Feb 17 | Nov 27 | Feb 2 | Nov 28 |
| 2000 | Feb 25 | Nov 16 | Jan 9 | Nov 18 |
| 1999 | Feb 12 | Nov 23 | Feb 12 | Dec 4 |
| 1998 | Mar 1 | Dec 7 | Jan 7 | Dec 8 |
| 1997 | Feb 22 | Dec 10 | Feb 7 | Dec 11 |
| 1996 | Jan 27 | Nov 30 | Jan 24 | Dec 3 |
| 1995 | Mar 26 | Nov 28 | none | Dec 23 |
| 1994 | Feb 23 | Nov 20 | Feb 2 | Nov 20 |
| 1993 | none | Nov 26 | none | Nov 27 |
| 1992 | Jan 24 | Nov 21 | Jan 15 | Nov 25 |
| 1991 | Mar 17 | Dec 2 | Jan 31 | Dec 3 |
| 1990 | Mar 15 | Nov 28 | Mar 14 | Dec 7 |
| 1989 | Mar 5 | Nov 28 | Jan 17 | Dec 1 |
| 1988 | Mar 13 | Nov 19 | Jan 24 | Dec 27 |
| 1987 | Feb 28 | Nov 26 | Jan 22 | Dec 15 |
| 1986 | Feb 11 | Dec 1 | Feb 11 | Dec 12 |
| 1985 | Mar 30 | Nov 14 | Feb 6 | Nov 15 |
| 1984 | Mar 6 | Nov 26 | Feb 27 | Nov 27 |
| 1983 | Apr 14 | Nov 23 | Jan 22 | Nov 27 |
| 1982 | no data | Dec 3 | no data | Dec 25 |
"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.