Frost history / Groton New London Ap, CT
Groton New London Ap, CT: frost dates by year
Last spring and first fall frost at NOAA station USW00014707, 2000 to 2024, measured from daily minimum temperatures.
Elevation 10 ft, 41.328, -72.049. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 21 | Oct 29 |
| Earliest | Mar 30 (2017) | Oct 9 (2001) |
| Latest | May 11 (2010) | Nov 14 (2022) |
| Trend | 4.2 days earlier per decade | 4.4 days later per decade |
| Years with data | 25 | 25 |
At 28°F (hard freeze) the median last spring date is Mar 30 and the median first fall date is Nov 10.
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 |
|---|---|---|---|---|
| 2024 | Apr 26 | Oct 28 | Mar 22 | Nov 10 |
| 2023 | Apr 9 | Nov 2 | Apr 3 | Nov 12 |
| 2022 | Apr 21 | Nov 14 | Mar 30 | Nov 19 |
| 2021 | Apr 4 | Nov 4 | Apr 4 | Nov 6 |
| 2020 | Apr 25 | Oct 30 | Apr 23 | Oct 30 |
| 2019 | Apr 29 | Nov 2 | Apr 2 | Nov 9 |
| 2018 | Apr 23 | Oct 18 | Apr 11 | Nov 12 |
| 2017 | Mar 30 | Nov 9 | Mar 24 | Nov 10 |
| 2016 | Apr 13 | Nov 8 | Apr 6 | Dec 10 |
| 2015 | Apr 13 | Oct 18 | Apr 2 | Oct 19 |
| 2014 | Apr 21 | Oct 20 | Mar 27 | Nov 15 |
| 2013 | Apr 7 | Oct 26 | Apr 7 | Nov 13 |
| 2012 | Apr 30 | Oct 13 | Mar 10 | Oct 13 |
| 2011 | Apr 22 | Oct 30 | Mar 28 | Dec 2 |
| 2010 | May 11 | Nov 1 | Mar 27 | Nov 29 |
| 2009 | Apr 13 | Oct 19 | Mar 26 | Dec 7 |
| 2008 | May 1 | Oct 21 | Mar 30 | Oct 31 |
| 2007 | Apr 21 | Nov 7 | Apr 11 | Nov 8 |
| 2006 | Apr 11 | Oct 27 | Mar 29 | Nov 4 |
| 2005 | Apr 17 | Nov 3 | Apr 17 | Nov 11 |
| 2004 | Apr 6 | Nov 4 | Mar 24 | Nov 4 |
| 2003 | Apr 25 | Oct 19 | Apr 1 | Oct 24 |
| 2002 | Apr 27 | Oct 22 | Mar 23 | Oct 24 |
| 2001 | May 7 | Oct 9 | Apr 5 | Oct 29 |
| 2000 | May 1 | Oct 29 | Mar 26 | Nov 19 |
"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.