Frost history / Hayes River, AK
Hayes River, AK: frost dates by year
Last spring and first fall frost at NOAA station USC00503573, 1981 to 2010, measured from daily minimum temperatures.
Elevation 1,000 ft, 61.987, -152.076. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 2 | Sep 6 |
| Earliest | May 23 (1981) | Aug 13 (1986) |
| Latest | Jun 17 (1985) | Oct 2 (1995) |
| Trend | little change (less than half a day per decade) | 3.8 days later per decade |
| Years with data | 18 | 24 |
At 28°F (hard freeze) the median last spring date is May 21 and the median first fall date is Sep 22.
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 |
|---|---|---|---|---|
| 2010 | no data | Sep 20 | no data | Sep 22 |
| 2008 | no data | Sep 22 | no data | Sep 22 |
| 2007 | no data | Aug 29 | no data | Oct 4 |
| 2006 | Jun 6 | Sep 11 | May 10 | Sep 18 |
| 2005 | May 25 | no data | May 3 | no data |
| 2003 | Jun 4 | no data | May 17 | no data |
| 2000 | no data | Aug 15 | no data | Aug 26 |
| 1999 | no data | Sep 8 | no data | Sep 25 |
| 1998 | Jun 3 | Aug 19 | May 24 | Sep 26 |
| 1997 | no data | Sep 26 | no data | Oct 1 |
| 1996 | May 26 | Aug 28 | May 3 | Sep 20 |
| 1995 | no data | Oct 2 | no data | Oct 13 |
| 1994 | Jun 5 | Aug 29 | Apr 19 | Aug 29 |
| 1993 | May 27 | Sep 10 | Apr 22 | Sep 22 |
| 1992 | no data | Sep 3 | no data | Sep 10 |
| 1991 | Jun 8 | Aug 29 | May 31 | Sep 22 |
| 1990 | May 25 | Sep 23 | May 22 | Oct 2 |
| 1989 | Jun 12 | Sep 16 | May 20 | Sep 16 |
| 1988 | Jun 1 | Sep 8 | May 25 | Sep 25 |
| 1987 | Jun 10 | Aug 31 | May 29 | Sep 9 |
| 1986 | Jun 9 | Aug 13 | May 22 | Sep 24 |
| 1985 | Jun 17 | Sep 4 | May 22 | Sep 18 |
| 1984 | May 31 | Aug 28 | May 14 | Aug 28 |
| 1983 | May 27 | Aug 14 | May 19 | Sep 16 |
| 1982 | May 24 | Sep 12 | May 22 | Sep 12 |
| 1981 | May 23 | Sep 10 | May 22 | 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.