Frost history / Silver City 5 W, ID
Silver City 5 W, ID: frost dates by year
Last spring and first fall frost at NOAA station USC00108412, 1984 to 2008, measured from daily minimum temperatures.
Elevation 6,160 ft, 43.002, -116.832. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 13 | Sep 18 |
| Earliest | May 25 (1997) | Aug 30 (1985) |
| Latest | Jul 18 (1986) | Oct 8 (1993) |
| Trend | 8.0 days earlier per decade | 8.4 days later per decade |
| Years with data | 16 | 13 |
At 28°F (hard freeze) the median last spring date is May 20 and the median first fall date is Oct 4.
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 |
|---|---|---|---|---|
| 2008 | Jun 11 | no data | May 21 | no data |
| 2006 | May 28 | Sep 16 | May 9 | Oct 25 |
| 2005 | Jun 7 | Oct 2 | Apr 19 | Oct 5 |
| 1998 | Jun 16 | no data | Apr 29 | no data |
| 1997 | May 25 | Oct 7 | May 2 | Oct 8 |
| 1996 | Jun 18 | Sep 17 | May 23 | Oct 14 |
| 1995 | Jun 19 | Oct 4 | Jun 7 | Oct 4 |
| 1994 | Jun 14 | Oct 2 | Apr 14 | Oct 3 |
| 1993 | Jun 28 | Oct 8 | May 8 | Oct 29 |
| 1992 | Jun 13 | Sep 13 | Apr 23 | Sep 13 |
| 1990 | Jun 13 | no data | May 31 | no data |
| 1989 | May 30 | Sep 18 | May 24 | Oct 4 |
| 1988 | no data | Sep 10 | no data | Sep 19 |
| 1987 | Jun 18 | no data | May 20 | no data |
| 1986 | Jul 18 | Sep 10 | May 22 | Sep 22 |
| 1985 | Jun 25 | Aug 30 | May 30 | Sep 10 |
| 1984 | Jun 11 | Sep 21 | Jun 11 | Sep 22 |
"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.