Frost history / Lees Ferry, AZ
Lees Ferry, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00024849, 1951 to 2011, measured from daily minimum temperatures.
Elevation 3,210 ft, 36.864, -111.602. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 17 | Nov 17 |
| Earliest | Feb 7 (1957) | Oct 28 (1970) |
| Latest | Apr 28 (1970) | Dec 2 (1967) |
| Trend | 1.3 days earlier per decade | 1.2 days later per decade |
| Years with data | 46 | 45 |
At 28°F (hard freeze) the median last spring date is Feb 25 and the median first fall date is Nov 25.
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 |
|---|---|---|---|---|
| 2011 | Mar 1 | Nov 27 | Feb 13 | Dec 4 |
| 2010 | Feb 23 | Nov 23 | Feb 23 | Nov 25 |
| 2008 | Mar 4 | Nov 23 | Feb 7 | Dec 14 |
| 2007 | Mar 5 | Nov 22 | Mar 5 | Nov 22 |
| 2006 | Mar 31 | Nov 29 | Feb 26 | Nov 29 |
| 2004 | no data | Nov 29 | no data | Nov 30 |
| 2003 | Mar 29 | Nov 23 | Mar 29 | Nov 24 |
| 2002 | Mar 17 | Nov 6 | Mar 17 | Nov 26 |
| 2001 | Mar 2 | Nov 15 | Feb 17 | Nov 28 |
| 2000 | Mar 21 | Nov 7 | Feb 2 | Nov 12 |
| 1999 | Apr 10 | Nov 22 | Feb 12 | Nov 22 |
| 1994 | Feb 25 | Nov 14 | Feb 25 | Nov 14 |
| 1993 | Feb 15 | Nov 6 | Jan 28 | Nov 20 |
| 1992 | Feb 19 | Nov 12 | Feb 3 | Nov 25 |
| 1990 | no data | Nov 8 | no data | Nov 23 |
| 1988 | Mar 30 | Nov 16 | Mar 14 | Nov 20 |
| 1987 | Mar 3 | no data | Feb 27 | no data |
| 1986 | Feb 10 | Nov 9 | Feb 10 | Dec 10 |
| 1985 | Mar 5 | Nov 12 | Mar 5 | Nov 15 |
| 1984 | no data | Nov 21 | no data | Nov 21 |
| 1983 | no data | Nov 27 | no data | Nov 28 |
| 1982 | Apr 8 | Nov 12 | Feb 9 | Nov 16 |
| 1981 | no data | Nov 20 | no data | Nov 26 |
| 1980 | Mar 31 | no data | Mar 18 | no data |
| 1979 | Apr 3 | Oct 30 | Feb 19 | Nov 15 |
| 1978 | Feb 24 | Nov 14 | Feb 18 | Dec 6 |
| 1977 | Mar 30 | Nov 11 | Mar 30 | Dec 19 |
| 1976 | Mar 21 | Nov 23 | Feb 3 | Nov 26 |
| 1975 | Apr 3 | no data | Mar 28 | no data |
| 1974 | Mar 5 | Nov 24 | Feb 26 | Nov 28 |
| 1973 | Mar 23 | Nov 6 | Feb 18 | Nov 28 |
| 1972 | Mar 28 | Nov 1 | Feb 13 | Nov 29 |
| 1971 | Mar 19 | Oct 29 | Mar 19 | Nov 19 |
| 1970 | Apr 28 | Oct 28 | Apr 28 | Dec 11 |
| 1969 | Mar 16 | Nov 18 | Mar 8 | Nov 19 |
| 1968 | Mar 12 | Nov 20 | Jan 27 | Nov 24 |
| 1967 | Mar 9 | Dec 2 | Feb 21 | Dec 2 |
| 1966 | Mar 23 | Nov 9 | Mar 5 | Dec 12 |
| 1965 | no data | Nov 28 | no data | Nov 29 |
| 1963 | Mar 21 | Nov 23 | Feb 13 | Dec 3 |
| 1962 | Mar 17 | no data | Mar 16 | no data |
| 1961 | Mar 8 | no data | Feb 6 | no data |
| 1960 | Mar 4 | Nov 17 | Feb 24 | Dec 2 |
| 1959 | Mar 21 | no data | Feb 15 | no data |
| 1958 | Mar 10 | Nov 17 | Feb 2 | Nov 18 |
| 1957 | Feb 7 | Nov 18 | Feb 7 | Nov 22 |
| 1956 | Mar 19 | Nov 2 | Mar 19 | Nov 15 |
| 1955 | Apr 4 | Nov 4 | Mar 21 | Nov 23 |
| 1954 | Mar 15 | Nov 20 | Mar 11 | Dec 9 |
| 1953 | Mar 7 | no data | Mar 5 | no data |
| 1952 | Mar 23 | Nov 10 | Mar 23 | Nov 24 |
| 1951 | Mar 19 | Nov 17 | Mar 3 | Nov 17 |
"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.