Frost history / Plummer 3 Wsw, ID
Plummer 3 Wsw, ID: frost dates by year
Last spring and first fall frost at NOAA station USC00107188, 1991 to 2022, measured from daily minimum temperatures.
Elevation 2,905 ft, 47.311, -116.954. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 12 | Oct 6 |
| Earliest | Apr 23 (2018) | Sep 6 (1999) |
| Latest | Jun 13 (1991) | Nov 3 (2015) |
| Trend | 8.4 days earlier per decade | 6.1 days later per decade |
| Years with data | 14 | 14 |
At 28°F (hard freeze) the median last spring date is Apr 15 and the median first fall date is Oct 13.
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 |
|---|---|---|---|---|
| 2022 | no data | Oct 23 | no data | Nov 3 |
| 2021 | May 10 | Sep 17 | Apr 13 | Oct 12 |
| 2020 | May 8 | Oct 16 | Apr 17 | Oct 22 |
| 2019 | May 3 | Sep 29 | Apr 28 | Oct 2 |
| 2018 | Apr 23 | Oct 3 | Apr 23 | Oct 4 |
| 2017 | May 13 | Oct 9 | Apr 12 | Oct 31 |
| 2016 | Apr 25 | Oct 11 | Mar 19 | Oct 12 |
| 2015 | May 6 | Nov 3 | Apr 26 | Nov 5 |
| 2014 | May 12 | Oct 28 | Apr 3 | Nov 10 |
| 2013 | May 24 | Oct 4 | May 1 | Oct 30 |
| 2002 | no data | Oct 1 | no data | Oct 12 |
| 2001 | no data | Oct 6 | no data | Oct 10 |
| 2000 | May 12 | no data | Mar 12 | no data |
| 1999 | no data | Sep 6 | no data | Oct 14 |
| 1998 | May 16 | no data | Apr 3 | no data |
| 1997 | May 23 | Oct 6 | Apr 9 | Oct 10 |
| 1992 | May 21 | no data | May 12 | no data |
| 1991 | Jun 13 | no data | Apr 30 | no data |
"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.