Frost history / Riverside Fire Stn 3, CA
Riverside Fire Stn 3, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00047470, 1951 to 2016, measured from daily minimum temperatures.
Elevation 840 ft, 33.951, -117.388. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Feb 17 | Dec 11 |
| Earliest | Jan 2 (1967) | Oct 30 (1971) |
| Latest | Apr 12 (1953) | Dec 31 (1966) |
| Trend | 8.2 days earlier per decade | 3.6 days later per decade |
| Years with data | 54, 12 with no freeze | 56, 17 with no freeze |
At 28°F (hard freeze) the median last spring date is Jan 26 and the median first fall date is Dec 9.
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 |
|---|---|---|---|---|
| 2016 | none | no data | none | no data |
| 2015 | Jan 3 | Dec 28 | Jan 1 | none |
| 2014 | none | none | none | none |
| 2013 | Jan 13 | none | Jan 13 | none |
| 2012 | no data | none | no data | none |
| 2006 | no data | Dec 20 | no data | none |
| 2003 | none | Dec 27 | none | none |
| 2001 | no data | none | no data | none |
| 2000 | none | none | none | none |
| 1999 | none | none | none | none |
| 1998 | none | Dec 7 | none | Dec 7 |
| 1997 | none | Dec 27 | none | none |
| 1996 | Feb 27 | none | none | none |
| 1995 | none | none | none | none |
| 1994 | none | Nov 20 | none | Nov 20 |
| 1993 | Jan 5 | none | none | none |
| 1992 | none | no data | none | no data |
| 1991 | none | none | none | none |
| 1990 | Feb 20 | Dec 21 | none | Dec 23 |
| 1989 | no data | none | no data | none |
| 1988 | Feb 17 | Dec 27 | none | none |
| 1987 | Jan 30 | Dec 15 | Jan 22 | Dec 26 |
| 1986 | Feb 10 | Dec 11 | none | none |
| 1985 | Mar 4 | Nov 13 | Feb 1 | Dec 13 |
| 1984 | Feb 17 | Nov 15 | none | none |
| 1983 | Jan 2 | Nov 22 | none | none |
| 1982 | Mar 19 | Dec 17 | none | none |
| 1981 | Jan 31 | none | none | none |
| 1980 | none | none | none | none |
| 1979 | Feb 9 | Dec 28 | Jan 29 | none |
| 1978 | Feb 12 | Dec 7 | none | Dec 7 |
| 1977 | Mar 2 | none | none | none |
| 1976 | Mar 4 | Nov 29 | Jan 3 | none |
| 1975 | Feb 18 | Nov 29 | none | none |
| 1974 | Jan 3 | Dec 26 | none | none |
| 1973 | Jan 24 | none | Jan 7 | none |
| 1972 | Jan 31 | Dec 5 | Jan 31 | Dec 9 |
| 1971 | Mar 3 | Oct 30 | none | Dec 9 |
| 1970 | Apr 4 | none | Jan 4 | none |
| 1969 | Feb 1 | Dec 27 | none | Dec 30 |
| 1968 | Jan 30 | Dec 18 | none | Dec 21 |
| 1967 | Jan 2 | Dec 20 | none | none |
| 1966 | Mar 4 | Dec 31 | Mar 3 | none |
| 1965 | Feb 18 | Dec 19 | Feb 12 | none |
| 1964 | Mar 9 | Nov 14 | none | none |
| 1963 | Mar 5 | Dec 13 | Jan 20 | none |
| 1962 | Mar 15 | Dec 27 | Jan 15 | Dec 28 |
| 1961 | Jan 8 | Dec 13 | none | none |
| 1960 | Jan 18 | Dec 7 | Jan 3 | Dec 9 |
| 1959 | Feb 14 | Dec 30 | none | none |
| 1958 | Mar 3 | Nov 16 | none | Nov 17 |
| 1957 | Feb 5 | none | none | none |
| 1956 | Mar 13 | Nov 4 | Feb 17 | Dec 10 |
| 1955 | Apr 5 | Nov 16 | Feb 22 | Dec 31 |
| 1954 | Mar 26 | Dec 11 | Mar 16 | Dec 29 |
| 1953 | Apr 12 | Nov 21 | Mar 3 | Dec 6 |
| 1952 | Mar 9 | Nov 10 | Jan 11 | Nov 25 |
| 1951 | Mar 11 | Nov 25 | Feb 21 | Dec 9 |
"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.