Frost history / Clifton, AZ
Clifton, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00021849, 1951 to 2012, measured from daily minimum temperatures.
Elevation 3,520 ft, 33.056, -109.307. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 9 | Nov 21 |
| Earliest | Jan 25 (1968) | Oct 31 (1991) |
| Latest | Apr 17 (1976) | Dec 21 (1962) |
| Trend | 2.6 days earlier per decade | little change (less than half a day per decade) |
| Years with data | 47 | 46 |
At 28°F (hard freeze) the median last spring date is Feb 12 and the median first fall date is Dec 1.
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 3 | no data | Jan 15 | no data |
| 2011 | no data | Dec 5 | no data | Dec 6 |
| 2009 | Feb 14 | no data | none | no data |
| 2002 | Mar 17 | Dec 18 | Mar 3 | Dec 27 |
| 2001 | Mar 12 | Nov 28 | Feb 3 | Dec 13 |
| 2000 | no data | Nov 8 | no data | Nov 19 |
| 1999 | Feb 12 | no data | Feb 12 | no data |
| 1996 | Feb 28 | no data | Jan 25 | no data |
| 1995 | Mar 26 | Dec 11 | Jan 31 | Dec 18 |
| 1994 | Feb 24 | Nov 18 | Feb 3 | Nov 28 |
| 1993 | Feb 3 | Oct 31 | none | Nov 27 |
| 1992 | Jan 27 | Nov 21 | Jan 24 | Nov 24 |
| 1991 | Mar 15 | Oct 31 | Jan 31 | Nov 24 |
| 1990 | Mar 18 | Nov 28 | Mar 16 | Nov 29 |
| 1989 | Mar 6 | Dec 2 | Feb 8 | Dec 2 |
| 1988 | Mar 19 | Nov 16 | Mar 12 | Nov 19 |
| 1987 | Mar 31 | Nov 16 | Mar 31 | Nov 19 |
| 1986 | Feb 12 | Nov 24 | Feb 11 | Dec 11 |
| 1985 | no data | Nov 16 | no data | Dec 13 |
| 1984 | Mar 10 | Nov 27 | Jan 23 | Nov 27 |
| 1983 | Mar 21 | no data | Jan 22 | no data |
| 1982 | Feb 10 | Dec 3 | Feb 5 | Dec 27 |
| 1981 | Feb 8 | Dec 1 | Jan 20 | Dec 26 |
| 1978 | Feb 21 | Nov 20 | Jan 26 | Dec 3 |
| 1977 | Apr 5 | Nov 10 | Feb 26 | Dec 21 |
| 1976 | Apr 17 | Nov 13 | Jan 9 | Nov 14 |
| 1975 | Apr 10 | Nov 23 | Feb 24 | Nov 29 |
| 1974 | Mar 9 | Nov 26 | Feb 25 | Dec 1 |
| 1973 | Mar 17 | Nov 21 | Feb 12 | Nov 26 |
| 1972 | Feb 15 | Nov 1 | Feb 15 | Nov 2 |
| 1971 | Mar 4 | Dec 6 | Mar 2 | Dec 17 |
| 1970 | Feb 4 | Nov 17 | Jan 30 | Dec 12 |
| 1969 | Mar 16 | Nov 19 | Feb 2 | Nov 19 |
| 1968 | Jan 25 | Nov 28 | none | Dec 4 |
| 1967 | Mar 8 | Dec 3 | Feb 18 | Dec 11 |
| 1966 | Mar 5 | Nov 10 | Mar 4 | Nov 28 |
| 1965 | Mar 8 | Dec 19 | Mar 5 | Dec 19 |
| 1964 | Apr 6 | Nov 19 | Mar 5 | Dec 11 |
| 1963 | Feb 14 | Nov 24 | Feb 14 | Dec 6 |
| 1962 | Mar 15 | Dec 21 | Feb 28 | none |
| 1961 | Feb 28 | Nov 13 | Feb 9 | none |
| 1960 | Mar 17 | Nov 29 | Feb 25 | Dec 5 |
| 1959 | Mar 6 | Nov 27 | Jan 22 | Nov 29 |
| 1958 | Mar 12 | Nov 17 | Jan 23 | Nov 18 |
| 1957 | Mar 24 | Nov 18 | Mar 23 | Nov 23 |
| 1956 | no data | Nov 2 | no data | Nov 21 |
| 1955 | Mar 29 | Nov 10 | Feb 28 | none |
| 1954 | Mar 14 | Dec 17 | Jan 20 | Dec 20 |
| 1953 | Mar 10 | Nov 18 | Feb 22 | Nov 20 |
| 1952 | Mar 26 | Nov 16 | Feb 15 | Nov 17 |
| 1951 | Mar 5 | Nov 24 | Mar 5 | Dec 26 |
"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.