Frost history / Two Rivers, AK
Two Rivers, AK: frost dates by year
Last spring and first fall frost at NOAA station USC00509489, 1993 to 2009, measured from daily minimum temperatures.
Elevation 605 ft, 64.866, -146.954. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 4 | Aug 26 |
| Earliest | May 12 (1993) | Aug 7 (1996) |
| Latest | Jul 31 (2005) | Sep 17 (1993) |
| Trend | 8.2 days later per decade | 8.8 days earlier per decade |
| Years with data | 16 | 14 |
At 28°F (hard freeze) the median last spring date is May 24 and the median first fall date is Sep 14.
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 |
|---|---|---|---|---|
| 2009 | May 19 | no data | May 15 | no data |
| 2008 | Jun 14 | Aug 25 | May 30 | Aug 29 |
| 2006 | Jun 6 | no data | Jun 5 | no data |
| 2005 | Jul 31 | Aug 19 | May 5 | Aug 20 |
| 2004 | May 22 | Aug 30 | Apr 26 | Sep 4 |
| 2003 | May 25 | Aug 21 | May 25 | Sep 12 |
| 2002 | Jun 22 | Aug 14 | Jun 22 | Sep 3 |
| 2001 | Jun 2 | Sep 7 | May 16 | Sep 22 |
| 2000 | Jul 28 | Aug 15 | May 27 | Sep 16 |
| 1999 | Jun 5 | Aug 27 | May 30 | Sep 9 |
| 1998 | Jun 3 | Aug 28 | May 17 | Sep 26 |
| 1997 | Jun 17 | Aug 19 | Jun 1 | Sep 27 |
| 1996 | Jun 6 | Aug 7 | Jun 5 | Aug 24 |
| 1995 | May 31 | Sep 4 | May 22 | Oct 2 |
| 1994 | May 29 | Sep 6 | May 8 | Sep 21 |
| 1993 | May 12 | Sep 17 | Apr 25 | Sep 18 |
"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.