Frost history / Johnson Pass, UT
Johnson Pass, UT: frost dates by year
Last spring and first fall frost at NOAA station USC00424362, 1975 to 2012, measured from daily minimum temperatures.
Elevation 5,580 ft, 40.337, -112.611. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 24 | Sep 29 |
| Earliest | Apr 23 (1992) | Sep 8 (2001) |
| Latest | Jun 23 (1989) | Nov 8 (1987) |
| Trend | 1.9 days earlier per decade | 1.7 days earlier per decade |
| Years with data | 35 | 37 |
At 28°F (hard freeze) the median last spring date is May 6 and the median first fall date is Oct 17.
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 |
|---|---|---|---|---|
| 2012 | Jun 10 | no data | May 6 | no data |
| 2011 | Jun 3 | Oct 6 | May 4 | Oct 26 |
| 2010 | May 29 | Oct 25 | May 7 | Oct 26 |
| 2009 | no data | Sep 30 | no data | Oct 1 |
| 2008 | May 10 | Oct 10 | May 10 | Oct 10 |
| 2007 | May 23 | Sep 24 | May 22 | Sep 30 |
| 2006 | May 10 | Sep 16 | Apr 20 | Oct 18 |
| 2005 | no data | Sep 25 | no data | Oct 5 |
| 2004 | May 30 | Sep 21 | Apr 29 | Oct 31 |
| 2003 | May 20 | Sep 18 | May 19 | Oct 25 |
| 2002 | May 24 | Oct 12 | May 8 | Oct 12 |
| 2001 | Jun 13 | Sep 8 | May 4 | Oct 10 |
| 2000 | May 12 | Sep 24 | May 12 | Sep 24 |
| 1999 | May 14 | Sep 27 | May 11 | Sep 27 |
| 1998 | May 14 | Oct 4 | Apr 26 | Oct 4 |
| 1997 | May 2 | Oct 8 | May 2 | Oct 8 |
| 1996 | May 24 | Sep 18 | Apr 29 | Oct 17 |
| 1995 | Jun 7 | Sep 21 | Apr 23 | Sep 21 |
| 1994 | May 17 | Oct 15 | Apr 25 | Oct 29 |
| 1993 | May 10 | Sep 13 | Apr 27 | Oct 26 |
| 1992 | Apr 23 | Oct 7 | Apr 19 | Nov 3 |
| 1991 | May 12 | Oct 20 | Apr 30 | Oct 24 |
| 1990 | Jun 1 | Oct 3 | Apr 30 | Oct 8 |
| 1989 | Jun 23 | Oct 16 | Jun 23 | Oct 28 |
| 1988 | May 30 | Sep 12 | May 7 | Nov 7 |
| 1987 | May 3 | Nov 8 | Apr 20 | Nov 8 |
| 1986 | May 22 | Sep 25 | May 22 | Oct 12 |
| 1985 | May 30 | Sep 28 | Apr 26 | Sep 29 |
| 1984 | May 16 | Sep 24 | May 7 | Oct 15 |
| 1983 | May 16 | Sep 20 | May 14 | Nov 8 |
| 1982 | no data | Sep 29 | no data | Sep 29 |
| 1981 | Jun 14 | Oct 13 | May 7 | Oct 30 |
| 1980 | May 26 | Oct 16 | Apr 12 | Oct 23 |
| 1979 | Jun 8 | Oct 21 | Jun 8 | Oct 30 |
| 1978 | May 31 | Sep 12 | May 31 | Sep 19 |
| 1977 | May 26 | Sep 23 | Apr 20 | Sep 23 |
| 1976 | Jun 14 | Oct 18 | Jun 14 | Oct 18 |
| 1975 | May 25 | Oct 7 | May 25 | Oct 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.