Frost history / Douglas, AZ
Douglas, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00022659, 1965 to 2015, measured from daily minimum temperatures.
Elevation 4,040 ft, 31.345, -109.539. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 14 | Oct 29 |
| Earliest | Feb 26 (2015) | Oct 8 (1992) |
| Latest | May 7 (1975) | Nov 23 (2003) |
| Trend | 9.4 days earlier per decade | 5.1 days later per decade |
| Years with data | 31 | 30 |
At 28°F (hard freeze) the median last spring date is Mar 31 and the median first fall date is Nov 5.
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 |
|---|---|---|---|---|
| 2015 | Feb 26 | no data | Jan 27 | no data |
| 2003 | Mar 6 | Nov 23 | Feb 10 | Nov 24 |
| 2002 | Mar 7 | Nov 6 | Mar 5 | Dec 19 |
| 1993 | Apr 15 | no data | Apr 15 | no data |
| 1992 | Mar 25 | Oct 8 | Mar 10 | Nov 2 |
| 1991 | Apr 29 | Oct 28 | Apr 13 | Oct 29 |
| 1990 | Mar 18 | Oct 23 | Mar 17 | Nov 4 |
| 1989 | Mar 22 | Oct 28 | Mar 5 | Oct 30 |
| 1988 | Apr 2 | Nov 16 | Apr 2 | Nov 16 |
| 1987 | Apr 6 | Nov 11 | Mar 31 | Nov 16 |
| 1986 | Apr 20 | Nov 9 | Feb 23 | Nov 24 |
| 1985 | Mar 31 | Nov 7 | Mar 31 | Nov 16 |
| 1984 | Apr 21 | Nov 6 | Apr 2 | Nov 27 |
| 1983 | Apr 14 | Nov 20 | Apr 14 | Nov 20 |
| 1982 | no data | Nov 4 | no data | Nov 4 |
| 1981 | Apr 4 | Nov 1 | Feb 23 | Dec 1 |
| 1980 | Apr 15 | Oct 16 | Mar 31 | Oct 17 |
| 1979 | Apr 11 | Oct 22 | Mar 30 | Oct 31 |
| 1978 | Apr 18 | Oct 23 | Mar 12 | Oct 23 |
| 1977 | Apr 5 | Oct 29 | Apr 4 | Nov 10 |
| 1976 | Apr 18 | Oct 29 | Apr 18 | Oct 29 |
| 1975 | May 7 | Oct 15 | Apr 19 | Nov 12 |
| 1974 | Apr 11 | Oct 30 | Apr 4 | Nov 4 |
| 1973 | Apr 20 | Oct 11 | Apr 9 | Nov 15 |
| 1972 | Apr 21 | Nov 1 | Apr 15 | Nov 1 |
| 1971 | Apr 25 | Oct 19 | Apr 25 | Oct 30 |
| 1970 | May 2 | Oct 27 | Apr 2 | Oct 28 |
| 1969 | May 7 | Oct 23 | Mar 27 | Nov 2 |
| 1968 | Apr 23 | Oct 16 | Apr 23 | Nov 6 |
| 1967 | May 2 | Oct 31 | May 2 | Oct 31 |
| 1966 | Mar 7 | Nov 2 | Mar 5 | Nov 27 |
| 1965 | Mar 20 | Oct 18 | Mar 6 | Nov 29 |
"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.