Frost history / Greenwood 2NE, DE
Greenwood 2NE, DE: frost dates by year
Last spring and first fall frost at NOAA station USC00073595, 1986 to 2009, measured from daily minimum temperatures.
Elevation 45 ft, 38.816, -75.576. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 10 | Oct 28 |
| Earliest | Mar 25 (1986) | Oct 9 (1988) |
| Latest | May 8 (1997) | Nov 14 (1986) |
| Trend | 2.8 days later per decade | little change (less than half a day per decade) |
| Years with data | 22 | 23 |
At 28°F (hard freeze) the median last spring date is Mar 29 and the median first fall date is Nov 7.
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 |
|---|---|---|---|---|
| 2009 | Apr 18 | Nov 7 | Apr 14 | Nov 7 |
| 2008 | Apr 18 | Oct 20 | Mar 26 | Nov 11 |
| 2007 | Apr 14 | Nov 5 | Apr 11 | Nov 8 |
| 2006 | Apr 11 | Oct 15 | Mar 22 | Nov 5 |
| 2005 | no data | Oct 29 | no data | Nov 18 |
| 2004 | Apr 8 | Oct 18 | Mar 24 | Nov 10 |
| 2003 | Apr 10 | Oct 24 | Apr 1 | Oct 24 |
| 2002 | Apr 7 | Nov 1 | Apr 7 | Nov 19 |
| 2001 | Apr 20 | no data | Apr 4 | no data |
| 2000 | Apr 1 | Oct 30 | Mar 18 | Nov 16 |
| 1999 | Apr 6 | Nov 8 | Mar 23 | Nov 18 |
| 1998 | no data | Oct 31 | no data | Nov 5 |
| 1997 | May 8 | Oct 23 | Apr 10 | Oct 23 |
| 1996 | Apr 10 | Oct 12 | Mar 13 | Nov 3 |
| 1995 | Apr 16 | Nov 5 | Apr 6 | Nov 5 |
| 1994 | Apr 9 | Oct 28 | Mar 21 | Nov 12 |
| 1993 | Apr 28 | Nov 2 | Mar 20 | Nov 4 |
| 1992 | Apr 14 | Oct 20 | Apr 4 | Oct 20 |
| 1991 | Apr 4 | Oct 21 | Apr 3 | Nov 5 |
| 1990 | Apr 19 | Oct 27 | Apr 13 | Oct 30 |
| 1989 | Apr 23 | Nov 4 | Apr 12 | Nov 19 |
| 1988 | Mar 28 | Oct 9 | Mar 23 | Oct 14 |
| 1987 | Apr 6 | Oct 26 | Mar 14 | Nov 21 |
| 1986 | Mar 25 | Nov 14 | Mar 25 | Nov 14 |
"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.