Frost history / Big River Lakes, AK
Big River Lakes, AK: frost dates by year
Last spring and first fall frost at NOAA station USC00500788, 1978 to 2009, measured from daily minimum temperatures.
Elevation 60 ft, 60.814, -152.297. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 9 | Oct 2 |
| Earliest | Apr 10 (2003) | Aug 21 (1997) |
| Latest | Jun 10 (1998) | Oct 24 (2006) |
| Trend | 1.0 days earlier per decade | 0.8 days earlier per decade |
| Years with data | 25 | 26 |
At 28°F (hard freeze) the median last spring date is Apr 25 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 |
|---|---|---|---|---|
| 2009 | May 10 | Sep 1 | Apr 13 | Sep 1 |
| 2007 | May 12 | Oct 8 | May 3 | Oct 9 |
| 2006 | May 18 | Oct 24 | Apr 16 | Oct 26 |
| 2005 | Apr 25 | no data | Apr 18 | no data |
| 2004 | Apr 28 | Sep 24 | Apr 15 | Oct 31 |
| 2003 | Apr 10 | Oct 16 | Apr 9 | Nov 11 |
| 2002 | May 10 | Oct 10 | May 3 | Nov 10 |
| 2000 | May 21 | Sep 30 | Apr 12 | Oct 10 |
| 1999 | May 22 | Oct 4 | Apr 27 | Oct 15 |
| 1998 | Jun 10 | no data | Jun 10 | no data |
| 1997 | no data | Aug 21 | no data | Oct 6 |
| 1994 | May 4 | Oct 1 | Apr 18 | Oct 9 |
| 1993 | May 8 | Sep 18 | Mar 26 | Oct 20 |
| 1992 | May 16 | Sep 11 | May 16 | Sep 21 |
| 1991 | May 4 | Oct 8 | Apr 13 | Oct 12 |
| 1990 | May 6 | Oct 3 | Apr 15 | Oct 13 |
| 1989 | no data | Oct 10 | no data | Oct 13 |
| 1988 | May 2 | Sep 25 | Apr 30 | Oct 10 |
| 1987 | May 9 | Sep 14 | May 3 | Oct 29 |
| 1986 | no data | Sep 25 | no data | Oct 28 |
| 1985 | May 18 | Oct 6 | May 14 | Oct 6 |
| 1984 | May 15 | Oct 12 | Apr 25 | Oct 18 |
| 1983 | May 1 | Sep 24 | Apr 25 | Sep 25 |
| 1982 | May 22 | Oct 5 | May 15 | Oct 10 |
| 1981 | May 6 | Sep 29 | Apr 16 | Oct 10 |
| 1980 | May 9 | Sep 2 | Apr 25 | Oct 9 |
| 1979 | May 9 | Oct 21 | Apr 26 | Oct 28 |
| 1978 | May 12 | Oct 14 | Apr 23 | Oct 15 |
"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.