Frost history / San Antonio/Seaworld, TX
San Antonio/Seaworld, TX: frost dates by year
Last spring and first fall frost at NOAA station USC00418169, 1988 to 2011, measured from daily minimum temperatures.
Elevation 940 ft, 29.451, -98.703. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 8 | Nov 30 |
| Earliest | Jan 20 (1992) | Oct 31 (1993) |
| Latest | Apr 8 (1996) | Dec 22 (1998) |
| Trend | 1.0 days later per decade | 2.1 days later per decade |
| Years with data | 15, 2 with no freeze | 17 |
At 28°F (hard freeze) the median last spring date is Feb 7 and the median first fall date is Dec 11.
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 |
|---|---|---|---|---|
| 2011 | Feb 11 | Dec 6 | Feb 11 | Dec 7 |
| 2010 | Mar 28 | Nov 3 | Mar 28 | Nov 29 |
| 2009 | no data | Dec 3 | no data | Dec 3 |
| 2007 | Mar 9 | Dec 16 | Feb 18 | none |
| 2006 | no data | Dec 1 | no data | none |
| 2005 | Jan 23 | no data | none | no data |
| 2004 | no data | Nov 30 | no data | Dec 24 |
| 2001 | no data | Nov 29 | no data | none |
| 2000 | Jan 30 | no data | Jan 30 | no data |
| 1998 | none | Dec 22 | none | Dec 22 |
| 1997 | Feb 15 | Nov 16 | Jan 29 | Dec 13 |
| 1996 | Apr 8 | Nov 25 | Mar 11 | Dec 18 |
| 1995 | Mar 8 | Dec 9 | none | Dec 10 |
| 1994 | Mar 10 | no data | Feb 2 | no data |
| 1993 | Mar 14 | Oct 31 | none | Nov 27 |
| 1992 | Jan 20 | Nov 27 | Jan 16 | none |
| 1991 | Jan 31 | Nov 4 | Jan 1 | Nov 24 |
| 1990 | none | Dec 5 | none | Dec 21 |
| 1989 | Mar 8 | Dec 9 | Mar 7 | Dec 12 |
| 1988 | no data | Nov 28 | no data | none |
"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.