Frost history / Maeser 9NW, UT
Maeser 9NW, UT: frost dates by year
Last spring and first fall frost at NOAA station USC00425268, 1983 to 2009, measured from daily minimum temperatures.
Elevation 6,448 ft, 40.560, -109.664. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 29 | Sep 23 |
| Earliest | Apr 24 (1992) | Sep 12 (1985) |
| Latest | Jun 17 (1998) | Oct 15 (1987) |
| Trend | little change (less than half a day per decade) | 2.6 days later per decade |
| Years with data | 25 | 27 |
At 28°F (hard freeze) the median last spring date is May 9 and the median first fall date is Oct 8.
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 14 | Sep 22 | May 9 | Oct 1 |
| 2008 | May 25 | Oct 12 | May 13 | Oct 12 |
| 2007 | May 24 | Sep 25 | May 4 | Oct 8 |
| 2006 | May 29 | Sep 16 | May 29 | Oct 18 |
| 2005 | Jun 7 | Oct 5 | Jun 7 | Oct 31 |
| 2004 | May 31 | Sep 22 | Apr 20 | Oct 23 |
| 2003 | May 19 | Sep 18 | May 6 | Sep 18 |
| 2002 | Jun 10 | Oct 12 | Jun 10 | Oct 12 |
| 2001 | Jun 13 | Oct 5 | Jun 13 | Oct 5 |
| 2000 | May 13 | Sep 23 | May 13 | Sep 24 |
| 1999 | Jun 5 | Sep 27 | May 17 | Sep 27 |
| 1998 | Jun 17 | Oct 5 | Apr 19 | Oct 6 |
| 1997 | May 4 | Oct 9 | May 4 | Oct 9 |
| 1996 | May 24 | Sep 18 | Apr 29 | Sep 26 |
| 1995 | May 13 | Sep 21 | May 13 | Sep 22 |
| 1994 | May 2 | Sep 22 | Apr 30 | Oct 29 |
| 1993 | Jun 7 | Sep 14 | May 9 | Sep 14 |
| 1992 | Apr 24 | Oct 7 | Apr 24 | Oct 7 |
| 1991 | no data | Sep 15 | no data | Oct 25 |
| 1990 | Jun 2 | Oct 3 | May 9 | Oct 8 |
| 1989 | May 31 | Sep 13 | May 31 | Oct 18 |
| 1988 | May 31 | Sep 19 | May 7 | Nov 5 |
| 1987 | May 27 | Oct 15 | Apr 21 | Oct 16 |
| 1986 | May 23 | Sep 26 | May 23 | Oct 12 |
| 1985 | May 30 | Sep 12 | Apr 27 | Sep 23 |
| 1984 | Jun 11 | Sep 25 | May 7 | Sep 25 |
| 1983 | no data | Sep 20 | no data | Sep 20 |
"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.