Frost history / Tonasket 4 Nne, WA
Tonasket 4 Nne, WA: frost dates by year
Last spring and first fall frost at NOAA station USC00458520, 1984 to 2004, measured from daily minimum temperatures.
Elevation 960 ft, 48.781, -119.424. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 1 | Oct 5 |
| Earliest | Apr 9 (1989) | Sep 18 (1988) |
| Latest | May 18 (2003) | Oct 18 (1993) |
| Trend | 3.2 days later per decade | 1.9 days later per decade |
| Years with data | 19 | 20 |
At 28°F (hard freeze) the median last spring date is Apr 8 and the median first fall date is Oct 15.
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 | Apr 24 | no data | Mar 20 | no data |
| 2003 | May 18 | Oct 10 | Apr 5 | Oct 24 |
| 2002 | May 10 | Oct 2 | Apr 24 | Oct 12 |
| 2001 | May 6 | Oct 5 | Apr 12 | Oct 15 |
| 2000 | May 7 | Sep 23 | Apr 8 | Oct 5 |
| 1999 | May 10 | Sep 28 | Apr 14 | Sep 28 |
| 1998 | Apr 25 | Oct 15 | Mar 29 | Oct 18 |
| 1997 | Apr 21 | Oct 7 | Apr 11 | Oct 12 |
| 1996 | May 9 | Sep 22 | Apr 4 | Oct 17 |
| 1995 | no data | Oct 5 | no data | Oct 19 |
| 1994 | Apr 14 | Oct 5 | Mar 26 | Oct 22 |
| 1993 | Apr 19 | Oct 18 | Apr 6 | Oct 20 |
| 1992 | May 11 | Oct 7 | Apr 8 | Oct 15 |
| 1991 | Apr 28 | Oct 4 | Apr 9 | Oct 18 |
| 1990 | Apr 30 | Oct 6 | Mar 27 | Oct 6 |
| 1989 | Apr 9 | Oct 3 | Apr 9 | Oct 14 |
| 1988 | May 1 | Sep 18 | Apr 9 | Oct 27 |
| 1987 | Apr 20 | Oct 10 | Mar 30 | Oct 10 |
| 1986 | May 15 | Oct 11 | Apr 30 | Oct 11 |
| 1985 | May 12 | Sep 22 | May 12 | Sep 29 |
| 1984 | no data | Sep 27 | no data | Sep 28 |
"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.