Frost history / Monument Valley, AZ
Monument Valley, AZ: frost dates by year
Last spring and first fall frost at NOAA station USC00025665, 1982 to 2007, measured from daily minimum temperatures.
Elevation 5,501 ft, 36.985, -110.120. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 18 | Nov 3 |
| Earliest | Mar 20 (2002) | Oct 8 (1982) |
| Latest | Jun 17 (1988) | Nov 22 (1999) |
| Trend | 7.8 days earlier per decade | 5.7 days later per decade |
| Years with data | 22 | 21 |
At 28°F (hard freeze) the median last spring date is Mar 29 and the median first fall date is Nov 9.
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 10 | no data | Apr 11 | no data |
| 2005 | no data | Nov 15 | no data | Nov 28 |
| 2004 | Mar 31 | Nov 1 | Mar 6 | Nov 1 |
| 2003 | Apr 15 | Nov 5 | Mar 29 | Nov 21 |
| 2002 | Mar 20 | Nov 3 | Mar 18 | Nov 26 |
| 2001 | Apr 11 | Nov 20 | Mar 1 | Nov 26 |
| 2000 | Apr 2 | Oct 31 | Mar 25 | Nov 4 |
| 1999 | Apr 12 | Nov 22 | Apr 12 | Nov 22 |
| 1997 | May 1 | Oct 25 | Apr 13 | Nov 15 |
| 1996 | Apr 21 | Oct 21 | Apr 13 | Oct 21 |
| 1995 | Apr 22 | no data | Mar 26 | no data |
| 1994 | Apr 27 | Nov 4 | Feb 24 | Nov 14 |
| 1993 | Apr 14 | Oct 30 | Mar 14 | Oct 30 |
| 1992 | Mar 21 | Nov 3 | Mar 9 | Nov 4 |
| 1991 | Apr 29 | Oct 25 | Apr 17 | Oct 28 |
| 1990 | May 2 | Nov 3 | Mar 16 | Nov 4 |
| 1989 | May 18 | Oct 28 | May 14 | Oct 28 |
| 1988 | Jun 17 | Nov 14 | Apr 2 | Nov 19 |
| 1987 | Mar 30 | Nov 14 | Mar 30 | Nov 16 |
| 1986 | Apr 3 | Nov 7 | Mar 19 | Nov 9 |
| 1985 | Mar 31 | no data | Mar 31 | no data |
| 1984 | Apr 29 | Oct 15 | Apr 27 | Oct 15 |
| 1983 | May 16 | Nov 8 | Apr 15 | Nov 9 |
| 1982 | no data | Oct 8 | no data | Oct 8 |
"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.