Frost history / Howell Wwtp, MI
Howell Wwtp, MI: frost dates by year
Last spring and first fall frost at NOAA station USC00203947, 2004 to 2014, measured from daily minimum temperatures.
Elevation 917 ft, 42.594, -83.933. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 17 | Oct 3 |
| Earliest | Apr 30 (2012) | Sep 16 (2007) |
| Latest | May 28 (2008) | Oct 22 (2013) |
| Trend | 0.7 days later per decade | 7.1 days later per decade |
| Years with data | 11 | 10 |
At 28°F (hard freeze) the median last spring date is Apr 30 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 |
|---|---|---|---|---|
| 2014 | May 18 | no data | Apr 17 | no data |
| 2013 | May 13 | Oct 22 | May 13 | Oct 23 |
| 2012 | Apr 30 | Sep 24 | Apr 30 | Oct 8 |
| 2011 | May 17 | Oct 3 | Apr 18 | Oct 22 |
| 2010 | May 10 | Oct 16 | May 10 | Oct 22 |
| 2009 | May 18 | Oct 1 | Apr 13 | Oct 1 |
| 2008 | May 28 | Oct 4 | May 2 | Oct 19 |
| 2007 | May 18 | Sep 16 | Apr 16 | Oct 14 |
| 2006 | May 23 | Sep 29 | Apr 27 | Oct 16 |
| 2005 | May 5 | Oct 17 | May 4 | Oct 27 |
| 2004 | May 5 | Oct 3 | May 4 | Oct 5 |
"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.