Frost history / Tustin Irvine Rch, CA
Tustin Irvine Rch, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00049087, 1951 to 2002, measured from daily minimum temperatures.
Elevation 235 ft, 33.703, -117.754. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 3 | Dec 8 |
| Earliest | Jan 2 (2001) | Oct 29 (1971) |
| Latest | Apr 19 (1955) | Dec 30 (1955) |
| Trend | 11.7 days earlier per decade | 1.5 days earlier per decade |
| Years with data | 41, 10 with no freeze | 43, 15 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 12 and the median first fall date is Dec 12.
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 |
|---|---|---|---|---|
| 2002 | Jan 30 | none | none | none |
| 2001 | Jan 2 | none | none | none |
| 2000 | none | Nov 14 | none | none |
| 1999 | none | none | none | none |
| 1998 | none | Dec 8 | none | Dec 8 |
| 1997 | none | none | none | none |
| 1996 | none | none | none | none |
| 1994 | none | Nov 19 | none | Dec 12 |
| 1993 | Jan 4 | none | none | none |
| 1992 | Jan 14 | Dec 20 | none | none |
| 1991 | none | none | none | none |
| 1990 | Feb 20 | Dec 21 | Feb 15 | Dec 23 |
| 1989 | Jan 15 | Dec 12 | Jan 7 | none |
| 1988 | none | Nov 20 | none | none |
| 1987 | no data | Dec 15 | no data | Dec 26 |
| 1979 | Jan 29 | Nov 21 | none | Nov 21 |
| 1978 | none | Dec 9 | none | none |
| 1977 | none | none | none | none |
| 1976 | Mar 13 | none | Jan 2 | none |
| 1975 | Jan 30 | Dec 6 | none | none |
| 1974 | Jan 3 | none | none | none |
| 1973 | no data | none | no data | none |
| 1972 | Feb 3 | no data | Jan 5 | no data |
| 1971 | Mar 3 | Oct 29 | none | Dec 9 |
| 1970 | Jan 30 | none | none | none |
| 1969 | Feb 1 | Dec 27 | none | none |
| 1968 | Jan 30 | Dec 6 | none | Dec 21 |
| 1967 | Mar 30 | Dec 21 | none | none |
| 1966 | Mar 3 | Dec 27 | none | none |
| 1965 | Feb 17 | Dec 23 | Feb 10 | none |
| 1964 | no data | Nov 14 | no data | none |
| 1963 | Jan 22 | none | Jan 20 | none |
| 1962 | Mar 15 | Dec 28 | Jan 15 | none |
| 1961 | Jan 13 | none | none | none |
| 1960 | Feb 21 | Dec 7 | Jan 3 | Dec 9 |
| 1959 | Feb 9 | Dec 14 | none | none |
| 1958 | Jan 23 | Nov 16 | none | Nov 16 |
| 1957 | Feb 1 | none | none | none |
| 1956 | Apr 2 | Nov 1 | Feb 17 | none |
| 1955 | Apr 19 | Dec 30 | Feb 3 | none |
| 1954 | Mar 13 | Dec 29 | Jan 10 | Dec 29 |
| 1953 | Apr 11 | Nov 21 | Feb 21 | Dec 24 |
| 1952 | Mar 3 | Dec 21 | Jan 4 | none |
| 1951 | Mar 11 | Dec 6 | Jan 1 | 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.