Frost history / Lake Susitna, AK
Lake Susitna, AK: frost dates by year
Last spring and first fall frost at NOAA station USC00505397, 1990 to 2003, measured from daily minimum temperatures.
Elevation 2,375 ft, 62.453, -146.679. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Jun 3 | Aug 26 |
| Earliest | May 24 (1998) | Aug 8 (1996) |
| Latest | Jun 18 (1992) | Sep 9 (2001) |
| Trend | 9.2 days earlier per decade | 2.7 days later per decade |
| Years with data | 12 | 10 |
At 28°F (hard freeze) the median last spring date is May 28 and the median first fall date is Sep 7.
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 |
|---|---|---|---|---|
| 2003 | May 28 | no data | May 22 | no data |
| 2002 | Jun 8 | no data | May 18 | no data |
| 2001 | May 26 | Sep 9 | May 25 | Sep 9 |
| 2000 | Jun 11 | Aug 17 | May 30 | Aug 23 |
| 1999 | May 29 | Aug 29 | May 27 | Sep 11 |
| 1998 | May 24 | no data | May 23 | no data |
| 1997 | Jun 3 | no data | Jun 1 | no data |
| 1996 | Jun 7 | Aug 8 | Jun 7 | Aug 28 |
| 1995 | Jun 1 | Sep 2 | May 29 | Oct 6 |
| 1994 | Jun 9 | Aug 23 | May 29 | Sep 7 |
| 1993 | Jun 2 | Aug 25 | May 11 | Sep 18 |
| 1992 | Jun 18 | Aug 26 | May 31 | Aug 26 |
| 1991 | no data | Aug 28 | no data | Aug 31 |
| 1990 | no data | Aug 25 | no data | Sep 7 |
"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.