Frost history / Ft Clatsop Natl Mem, OR
Ft Clatsop Natl Mem, OR: frost dates by year
Last spring and first fall frost at NOAA station USC00353014, 1999 to 2011, measured from daily minimum temperatures.
Elevation 42 ft, 46.136, -123.878. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 18 | Oct 31 |
| Earliest | Mar 18 (2010) | Oct 11 (2008) |
| Latest | May 8 (1999) | Dec 2 (2009) |
| Trend | 12.8 days earlier per decade | 17.4 days later per decade |
| Years with data | 13 | 12, 1 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 23 and the median first fall date is Dec 2.
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 |
|---|---|---|---|---|
| 2011 | Apr 18 | no data | Feb 26 | no data |
| 2010 | Mar 18 | Nov 22 | none | Nov 23 |
| 2009 | Apr 24 | Dec 2 | Mar 11 | Dec 5 |
| 2008 | Apr 21 | Oct 11 | Jan 26 | Dec 15 |
| 2007 | Apr 20 | Oct 31 | Jan 16 | Dec 9 |
| 2006 | Mar 19 | Oct 30 | Feb 20 | Nov 29 |
| 2005 | Mar 19 | Nov 23 | Feb 15 | Dec 16 |
| 2004 | Apr 1 | Nov 5 | Jan 6 | none |
| 2003 | Mar 24 | Oct 31 | Feb 25 | Nov 1 |
| 2002 | Apr 24 | Oct 30 | Mar 1 | Oct 30 |
| 2001 | Apr 14 | none | Feb 27 | none |
| 2000 | Apr 24 | Nov 11 | none | Nov 11 |
| 1999 | May 8 | Oct 15 | none | Dec 26 |
"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.