Frost history / Klamath, CA
Klamath, CA: frost dates by year
Last spring and first fall frost at NOAA station USC00044577, 1951 to 2004, measured from daily minimum temperatures.
Elevation 28 ft, 41.579, -124.075. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 17 | Nov 27 |
| Earliest | Jan 5 (1961) | Sep 17 (2003) |
| Latest | May 20 (2003) | Dec 27 (1999) |
| Trend | little change (less than half a day per decade) | 1.5 days earlier per decade |
| Years with data | 51 | 53, 4 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 3 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 |
|---|---|---|---|---|
| 2004 | no data | Nov 20 | no data | Nov 21 |
| 2003 | May 20 | Sep 17 | May 19 | Oct 10 |
| 2002 | Mar 18 | Oct 30 | Jan 29 | Nov 1 |
| 2001 | Feb 23 | Nov 27 | Feb 7 | none |
| 2000 | Jan 28 | Nov 10 | none | none |
| 1999 | Apr 10 | Dec 27 | Feb 1 | none |
| 1998 | Apr 15 | Nov 28 | none | Dec 19 |
| 1997 | Apr 5 | Dec 1 | Jan 23 | Dec 22 |
| 1996 | Mar 6 | Dec 14 | Feb 26 | none |
| 1995 | Apr 21 | Dec 23 | none | none |
| 1994 | Mar 25 | Nov 3 | Feb 4 | Nov 19 |
| 1993 | Feb 28 | Nov 13 | none | Nov 14 |
| 1992 | Jan 12 | Nov 10 | none | none |
| 1991 | Apr 12 | Nov 30 | Jan 1 | none |
| 1990 | no data | Dec 19 | no data | Dec 20 |
| 1989 | Mar 3 | Dec 11 | Feb 8 | none |
| 1988 | Mar 27 | Dec 15 | none | none |
| 1987 | Feb 27 | Nov 28 | Jan 16 | Dec 13 |
| 1986 | Mar 14 | none | none | none |
| 1985 | Mar 29 | Oct 9 | none | Nov 12 |
| 1984 | Feb 22 | Dec 1 | none | none |
| 1983 | Jan 20 | Dec 22 | none | Dec 22 |
| 1982 | Apr 8 | Nov 10 | Feb 5 | Dec 29 |
| 1981 | Mar 5 | none | none | none |
| 1980 | Mar 16 | Nov 12 | Jan 30 | none |
| 1979 | Feb 3 | Nov 12 | Feb 3 | none |
| 1978 | Feb 11 | Nov 10 | none | Nov 10 |
| 1977 | Mar 31 | Nov 19 | Mar 29 | Nov 20 |
| 1976 | Apr 4 | Nov 27 | Feb 10 | Nov 27 |
| 1975 | May 20 | Nov 17 | Feb 21 | Nov 18 |
| 1974 | Mar 9 | Nov 2 | Mar 8 | Dec 24 |
| 1973 | Apr 2 | Nov 19 | Jan 26 | none |
| 1972 | Apr 29 | Oct 30 | Apr 18 | Dec 5 |
| 1971 | Apr 21 | Oct 28 | Jan 4 | Oct 28 |
| 1970 | Apr 7 | Dec 12 | Jan 5 | none |
| 1969 | Mar 15 | Dec 5 | Mar 10 | none |
| 1968 | Apr 21 | Dec 17 | Jan 6 | Dec 20 |
| 1967 | Apr 19 | Dec 12 | none | Dec 12 |
| 1966 | Mar 17 | Nov 23 | Jan 21 | none |
| 1965 | no data | Dec 13 | no data | Dec 15 |
| 1964 | Mar 8 | no data | none | no data |
| 1963 | Mar 17 | Dec 11 | Jan 27 | none |
| 1962 | Mar 13 | Nov 29 | Feb 27 | Dec 24 |
| 1961 | Jan 5 | Nov 16 | Jan 4 | Nov 16 |
| 1960 | Mar 10 | Dec 5 | Jan 2 | none |
| 1959 | Mar 14 | Dec 4 | Jan 3 | none |
| 1958 | Mar 7 | Nov 16 | none | Nov 16 |
| 1957 | Feb 10 | none | Jan 30 | none |
| 1956 | Mar 12 | Nov 14 | Feb 16 | none |
| 1955 | May 13 | Nov 14 | Mar 20 | Nov 15 |
| 1954 | Apr 1 | Nov 29 | none | Dec 27 |
| 1953 | Mar 3 | none | Mar 2 | none |
| 1952 | Mar 22 | Nov 22 | none | none |
| 1951 | Mar 31 | Dec 7 | Mar 3 | 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.