Frost history / Westport Island, ME
Westport Island, ME: frost dates by year
Last spring and first fall frost at NOAA station USC00179547, 2003 to 2013, measured from daily minimum temperatures.
Elevation 90 ft, 43.888, -69.709. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 2 | Oct 19 |
| Earliest | Apr 23 (2011) | Oct 6 (2004) |
| Latest | May 14 (2007) | Oct 31 (2006) |
| Trend | 12.3 days earlier per decade | 7.6 days earlier per decade |
| Years with data | 11 | 10 |
At 28°F (hard freeze) the median last spring date is Apr 20 and the median first fall date is Nov 4.
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 |
|---|---|---|---|---|
| 2013 | Apr 23 | no data | Apr 7 | no data |
| 2012 | Apr 30 | Oct 13 | Apr 1 | Nov 6 |
| 2011 | Apr 23 | Oct 7 | Apr 16 | Nov 6 |
| 2010 | May 13 | Oct 19 | May 11 | Nov 3 |
| 2009 | Apr 30 | Oct 15 | Apr 20 | Nov 7 |
| 2008 | May 2 | Oct 18 | May 1 | Oct 20 |
| 2007 | May 14 | Oct 29 | Apr 20 | Oct 30 |
| 2006 | Apr 30 | Oct 31 | Apr 22 | Nov 4 |
| 2005 | May 13 | Oct 21 | Apr 22 | Oct 29 |
| 2004 | May 8 | Oct 6 | Apr 25 | Nov 4 |
| 2003 | May 4 | Oct 20 | Apr 19 | Oct 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.