Frost history / Castle Hot Springs, AZ
Castle Hot Springs, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00021353, 1959 to 2017, measured from daily minimum temperatures.
Elevation 1,990 ft, 33.983, -112.363. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 11 | Dec 12 |
| Earliest | Jan 4 (2015) | Oct 30 (1971) |
| Latest | Apr 19 (1976) | Dec 31 (2010) |
| Trend | 4.9 days earlier per decade | 0.6 days later per decade |
| Years with data | 55, 13 with no freeze | 53, 14 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 19 and the median first fall date is Dec 18.
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 |
|---|---|---|---|---|
| 2017 | Jan 25 | none | none | none |
| 2016 | none | none | none | none |
| 2015 | Jan 4 | Dec 29 | Jan 3 | none |
| 2014 | none | Dec 26 | none | none |
| 2013 | Feb 13 | Dec 6 | Jan 15 | none |
| 2012 | none | Dec 20 | none | Dec 29 |
| 2011 | Feb 10 | Dec 6 | Feb 4 | Dec 6 |
| 2010 | none | Dec 31 | none | Dec 31 |
| 2009 | none | none | none | none |
| 2008 | Feb 5 | no data | Jan 31 | no data |
| 2007 | Jan 17 | Dec 15 | Jan 15 | none |
| 2006 | none | Nov 30 | none | Nov 30 |
| 2005 | none | Nov 28 | none | none |
| 2004 | Feb 13 | Nov 30 | none | none |
| 2003 | none | Nov 23 | none | Dec 28 |
| 2002 | Mar 3 | none | Jan 31 | none |
| 2001 | Feb 9 | Dec 10 | none | none |
| 2000 | Jan 8 | none | none | none |
| 1999 | Feb 11 | no data | none | no data |
| 1998 | none | Dec 6 | none | Dec 7 |
| 1997 | no data | Dec 13 | no data | Dec 25 |
| 1995 | Jan 18 | none | none | none |
| 1994 | Feb 23 | Nov 20 | none | none |
| 1993 | none | Nov 25 | none | none |
| 1992 | Jan 16 | Dec 15 | none | none |
| 1991 | Jan 30 | Nov 29 | none | none |
| 1990 | Mar 14 | Dec 18 | Mar 14 | Dec 22 |
| 1989 | Feb 7 | Dec 12 | Feb 6 | none |
| 1988 | Jan 20 | Dec 26 | none | Dec 27 |
| 1987 | Feb 25 | Dec 13 | Jan 18 | Dec 14 |
| 1986 | Feb 10 | Dec 11 | none | none |
| 1985 | Mar 3 | Nov 19 | Feb 5 | Dec 10 |
| 1984 | Jan 22 | Dec 14 | Jan 18 | none |
| 1983 | Jan 21 | none | none | none |
| 1982 | Feb 28 | Dec 29 | Feb 28 | none |
| 1981 | Feb 1 | none | none | none |
| 1980 | none | none | none | none |
| 1979 | Jan 31 | no data | Jan 30 | no data |
| 1978 | Feb 19 | Dec 4 | none | Dec 7 |
| 1977 | no data | none | no data | none |
| 1976 | Apr 19 | no data | Jan 3 | no data |
| 1975 | Mar 28 | Nov 17 | Jan 4 | Nov 21 |
| 1974 | Feb 21 | Dec 14 | Jan 3 | Dec 24 |
| 1973 | Jan 28 | Dec 3 | none | none |
| 1972 | Feb 3 | Dec 12 | Jan 5 | none |
| 1971 | Mar 2 | Oct 30 | Mar 2 | none |
| 1970 | Jan 8 | none | Jan 8 | none |
| 1969 | Mar 8 | Dec 27 | none | none |
| 1968 | none | no data | none | no data |
| 1967 | Jan 10 | Dec 16 | Jan 3 | Dec 21 |
| 1966 | Mar 5 | Dec 27 | Mar 4 | none |
| 1965 | Mar 3 | none | Mar 3 | none |
| 1964 | Feb 15 | none | Jan 16 | none |
| 1963 | Feb 13 | Dec 14 | Jan 20 | none |
| 1962 | Mar 14 | none | Jan 12 | none |
| 1961 | none | Nov 22 | none | none |
| 1960 | Feb 25 | Dec 7 | Feb 25 | Dec 7 |
| 1959 | no data | Dec 27 | no data | none |
"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.