Frost history / Sunnyside City Ctr, UT
Sunnyside City Ctr, UT: frost dates by year
Last spring and first fall frost at NOAA station USC00428478, 1989 to 2007, measured from daily minimum temperatures.
Elevation 6,530 ft, 39.552, -110.385. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 26 | Oct 5 |
| Earliest | Apr 30 (1994) | Sep 13 (1993) |
| Latest | Jun 14 (2001) | Oct 24 (1991) |
| Trend | little change (less than half a day per decade) | 6.1 days earlier per decade |
| Years with data | 19 | 17 |
At 28°F (hard freeze) the median last spring date is May 2 and the median first fall date is Oct 16.
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 |
|---|---|---|---|---|
| 2007 | May 4 | Sep 30 | Apr 19 | Oct 7 |
| 2006 | May 29 | Sep 17 | Apr 19 | Oct 18 |
| 2005 | May 11 | Oct 5 | Apr 11 | Nov 15 |
| 2004 | May 30 | Sep 22 | May 13 | Oct 23 |
| 2003 | May 10 | Oct 11 | May 6 | Oct 31 |
| 2002 | Jun 10 | Oct 12 | May 22 | Oct 23 |
| 2001 | Jun 14 | Oct 10 | May 3 | Oct 10 |
| 2000 | May 13 | Sep 25 | May 12 | Oct 11 |
| 1999 | Jun 5 | no data | May 11 | no data |
| 1998 | May 23 | Oct 3 | Apr 25 | Oct 17 |
| 1997 | May 26 | no data | May 2 | no data |
| 1996 | May 26 | Sep 15 | Apr 29 | Sep 18 |
| 1995 | Jun 9 | Sep 21 | May 13 | Oct 4 |
| 1994 | Apr 30 | Oct 15 | Apr 27 | Oct 16 |
| 1993 | May 10 | Sep 13 | May 10 | Oct 9 |
| 1992 | May 10 | Oct 7 | Apr 20 | Oct 7 |
| 1991 | May 13 | Oct 24 | May 2 | Oct 28 |
| 1990 | Jun 2 | Oct 8 | Apr 29 | Oct 8 |
| 1989 | May 31 | Oct 18 | Apr 28 | Oct 27 |
"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.