Frost history / Pomeroy, WA
Pomeroy, WA: frost dates by year
Last spring and first fall frost at NOAA station USC00456610, 1951 to 2013, measured from daily minimum temperatures.
Elevation 1,934 ft, 46.467, -117.588. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 5 | Oct 3 |
| Earliest | Mar 30 (1990) | Sep 8 (1962) |
| Latest | Jun 8 (1989) | Oct 29 (1979) |
| Trend | 0.9 days later per decade | little change (less than half a day per decade) |
| Years with data | 37 | 37 |
At 28°F (hard freeze) the median last spring date is Apr 18 and the median first fall date is Oct 23.
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 | May 24 | Oct 1 | May 23 | Oct 4 |
| 2012 | May 11 | Sep 12 | May 11 | Oct 4 |
| 2011 | May 17 | Oct 17 | May 1 | Oct 25 |
| 1999 | no data | Sep 27 | no data | Oct 2 |
| 1995 | Apr 22 | no data | Apr 16 | no data |
| 1990 | Mar 30 | Oct 5 | Mar 28 | Oct 7 |
| 1989 | Jun 8 | Oct 5 | Jun 8 | Oct 15 |
| 1988 | no data | Sep 10 | no data | Oct 27 |
| 1987 | May 20 | no data | Mar 30 | no data |
| 1984 | Apr 29 | no data | Mar 30 | no data |
| 1983 | May 11 | Sep 28 | Apr 15 | Sep 29 |
| 1982 | May 5 | Oct 5 | Apr 26 | Oct 20 |
| 1981 | May 6 | Oct 4 | Apr 13 | Oct 21 |
| 1980 | Apr 3 | Oct 22 | Apr 2 | Nov 11 |
| 1979 | Apr 20 | Oct 29 | Mar 19 | Oct 31 |
| 1978 | May 23 | Oct 22 | Mar 15 | Oct 23 |
| 1977 | May 6 | Oct 3 | Apr 18 | Oct 11 |
| 1976 | Apr 28 | Oct 4 | Apr 21 | Oct 17 |
| 1975 | May 5 | Oct 24 | May 1 | Oct 24 |
| 1974 | no data | Sep 27 | no data | Nov 3 |
| 1973 | May 27 | Oct 3 | Apr 8 | Oct 8 |
| 1972 | May 1 | Sep 26 | Apr 20 | Oct 24 |
| 1971 | May 21 | no data | Apr 18 | no data |
| 1970 | Apr 27 | no data | Apr 27 | no data |
| 1969 | May 5 | Oct 5 | Mar 24 | Oct 14 |
| 1968 | Apr 27 | Oct 2 | Apr 22 | Nov 5 |
| 1967 | May 2 | Oct 24 | May 2 | Nov 2 |
| 1966 | Apr 28 | no data | Apr 19 | no data |
| 1965 | no data | Sep 16 | no data | Oct 16 |
| 1964 | May 23 | Oct 3 | Apr 19 | Nov 6 |
| 1963 | May 11 | Oct 19 | Mar 13 | Oct 26 |
| 1962 | May 5 | Sep 8 | Mar 14 | Nov 14 |
| 1961 | May 4 | Sep 22 | Apr 7 | Oct 8 |
| 1960 | no data | Sep 21 | no data | Oct 9 |
| 1959 | May 23 | Sep 29 | May 6 | Oct 1 |
| 1958 | Apr 29 | Sep 24 | Apr 28 | Oct 24 |
| 1957 | Apr 20 | Sep 19 | Mar 28 | Sep 19 |
| 1956 | Apr 30 | Oct 22 | Apr 6 | Nov 1 |
| 1955 | May 14 | Sep 24 | Apr 5 | Nov 2 |
| 1954 | May 2 | Sep 29 | May 1 | Oct 24 |
| 1953 | Apr 15 | Oct 22 | Apr 15 | Oct 22 |
| 1952 | no data | Oct 25 | no data | Oct 28 |
| 1951 | May 31 | Sep 27 | Apr 24 | Oct 25 |
"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.