Frost history / Maricopa 4 N, AZ
Maricopa 4 N, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00025270, 1960 to 2013, measured from daily minimum temperatures.
Elevation 1,160 ft, 33.114, -112.030. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 6 | Nov 20 |
| Earliest | Jan 4 (1993) | Oct 24 (1975) |
| Latest | Apr 29 (1970) | Dec 16 (1995) |
| Trend | 4.9 days earlier per decade | 1.6 days later per decade |
| Years with data | 53 | 52 |
At 28°F (hard freeze) the median last spring date is Feb 10 and the median first fall date is Nov 27.
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 |
|---|---|---|---|---|
| 2013 | Mar 1 | no data | Feb 26 | no data |
| 2012 | Mar 4 | Nov 11 | Jan 14 | Dec 11 |
| 2011 | Feb 28 | Dec 2 | Feb 13 | Dec 5 |
| 2010 | Feb 23 | Nov 10 | Jan 6 | Nov 23 |
| 2009 | Feb 16 | Oct 29 | Jan 29 | Dec 5 |
| 2008 | Mar 18 | Dec 6 | Feb 6 | Dec 27 |
| 2007 | Mar 2 | no data | Mar 2 | no data |
| 2006 | Feb 25 | Nov 30 | Jan 29 | Nov 30 |
| 2005 | Mar 16 | Nov 28 | none | Nov 28 |
| 2004 | Feb 16 | Nov 29 | Feb 15 | Nov 30 |
| 2003 | Feb 10 | Nov 24 | Feb 10 | Nov 24 |
| 2002 | Mar 6 | Nov 19 | Mar 5 | Dec 19 |
| 2001 | Feb 16 | Nov 24 | Feb 9 | Nov 27 |
| 2000 | Feb 27 | Nov 13 | Jan 11 | Nov 19 |
| 1999 | Feb 23 | Nov 23 | Feb 3 | Nov 23 |
| 1998 | Feb 4 | Nov 10 | Jan 9 | Dec 7 |
| 1997 | Mar 3 | Nov 29 | Feb 22 | Dec 13 |
| 1996 | Mar 2 | Dec 1 | Jan 25 | Dec 1 |
| 1995 | Apr 9 | Dec 16 | Apr 9 | Dec 19 |
| 1994 | Apr 24 | Nov 18 | Feb 24 | Nov 20 |
| 1993 | Jan 4 | Nov 27 | none | Nov 27 |
| 1992 | Mar 7 | Nov 12 | Jan 18 | Nov 25 |
| 1991 | Mar 12 | Oct 29 | Jan 31 | none |
| 1990 | Mar 15 | Nov 27 | Mar 15 | Nov 27 |
| 1989 | Mar 5 | Dec 1 | Jan 18 | Dec 7 |
| 1988 | Mar 15 | Nov 16 | Mar 13 | Nov 20 |
| 1987 | Mar 3 | Nov 16 | Jan 24 | Nov 27 |
| 1986 | Feb 11 | Nov 8 | Feb 11 | Dec 11 |
| 1985 | Mar 31 | Nov 16 | Mar 4 | Nov 20 |
| 1984 | Mar 8 | Nov 26 | Feb 24 | Nov 27 |
| 1983 | Apr 5 | Nov 22 | Jan 22 | Nov 27 |
| 1982 | Apr 1 | Dec 3 | Feb 5 | Dec 25 |
| 1981 | Feb 22 | Nov 20 | Feb 5 | Nov 26 |
| 1980 | Apr 1 | Nov 19 | Feb 10 | Nov 27 |
| 1979 | Mar 4 | Nov 1 | Jan 31 | Nov 20 |
| 1978 | Feb 20 | Dec 3 | Jan 25 | Dec 4 |
| 1977 | Apr 3 | Nov 22 | Mar 15 | Dec 17 |
| 1976 | Mar 14 | Nov 28 | Jan 27 | Nov 29 |
| 1975 | Apr 3 | Oct 24 | Feb 23 | Nov 20 |
| 1974 | Mar 10 | Nov 24 | Mar 6 | Nov 28 |
| 1973 | Apr 9 | Nov 15 | Feb 1 | Nov 20 |
| 1972 | Feb 17 | Nov 1 | Feb 16 | Dec 6 |
| 1971 | Mar 4 | Oct 30 | Mar 3 | Oct 30 |
| 1970 | Apr 29 | Nov 16 | Feb 3 | Dec 4 |
| 1969 | Mar 17 | Nov 22 | Mar 15 | Dec 6 |
| 1968 | Apr 19 | Nov 26 | Feb 1 | Nov 26 |
| 1967 | Feb 23 | Nov 30 | Feb 19 | Dec 10 |
| 1966 | Mar 5 | Nov 10 | Mar 4 | Nov 27 |
| 1965 | Mar 6 | Nov 12 | Mar 5 | none |
| 1964 | Mar 27 | Nov 16 | Mar 11 | Nov 16 |
| 1963 | Mar 16 | Nov 17 | Jan 27 | Dec 8 |
| 1962 | Mar 18 | Nov 20 | Mar 15 | none |
| 1961 | Mar 8 | Nov 7 | Feb 28 | Nov 15 |
| 1960 | no data | Nov 16 | no data | Nov 27 |
"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.