Frost history / Hope, AK
Hope, AK: frost dates by year
Last spring and first fall frost at NOAA station USC00503720, 1979 to 2011, measured from daily minimum temperatures.
Elevation 180 ft, 60.898, -149.629. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 20 | Sep 17 |
| Earliest | May 6 (2005) | Aug 22 (1980) |
| Latest | Jun 10 (1985) | Oct 3 (2007) |
| Trend | 7.0 days earlier per decade | 9.5 days later per decade |
| Years with data | 17 | 17 |
At 28°F (hard freeze) the median last spring date is May 7 and the median first fall date is Sep 29.
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 | May 14 | no data | May 12 | no data |
| 2008 | no data | Sep 27 | no data | Sep 29 |
| 2007 | no data | Oct 3 | no data | Oct 7 |
| 2005 | May 6 | no data | May 5 | no data |
| 1994 | May 17 | Sep 27 | Apr 19 | Sep 28 |
| 1993 | May 11 | Sep 18 | May 2 | Sep 24 |
| 1992 | May 18 | Sep 11 | May 16 | Sep 11 |
| 1991 | May 13 | Sep 26 | May 8 | Oct 6 |
| 1990 | May 26 | Sep 26 | Apr 26 | Oct 2 |
| 1989 | May 17 | Oct 3 | Apr 29 | Oct 11 |
| 1988 | May 20 | Sep 8 | May 2 | Sep 28 |
| 1987 | May 22 | Sep 14 | Apr 28 | Sep 14 |
| 1986 | May 31 | no data | May 7 | no data |
| 1985 | Jun 10 | Sep 17 | May 16 | Oct 5 |
| 1984 | May 28 | Aug 27 | May 12 | Oct 14 |
| 1983 | May 19 | Sep 15 | May 8 | Sep 24 |
| 1982 | May 29 | Sep 12 | May 17 | Oct 6 |
| 1981 | May 23 | Sep 22 | Apr 30 | Sep 25 |
| 1980 | May 29 | Aug 22 | May 9 | Sep 2 |
| 1979 | no data | Sep 1 | no data | Oct 14 |
"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.