Frost history / San Antonio Kelly Afb, TX
San Antonio Kelly Afb, TX: frost dates by year
Last spring and first fall frost at NOAA station USW00012909, 1951 to 2024, measured from daily minimum temperatures.
Elevation 682 ft, 29.383, -98.583. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Mar 3 | Dec 1 |
| Earliest | Jan 12 (1969) | Nov 1 (2019) |
| Latest | Mar 28 (1955) | Dec 30 (1954) |
| Trend | 0.9 days earlier per decade | little change (less than half a day per decade) |
| Years with data | 25 | 27, 2 with no freeze |
At 28°F (hard freeze) the median last spring date is Feb 15 and the median first fall date is Dec 14.
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 | Jan 20 | Dec 12 | Jan 17 | none |
| 2023 | Feb 18 | Dec 11 | none | none |
| 2022 | Mar 13 | Dec 18 | Mar 13 | Dec 22 |
| 2021 | Feb 19 | none | Feb 19 | none |
| 2020 | Feb 27 | Nov 30 | Feb 27 | Dec 1 |
| 2019 | Mar 5 | Nov 1 | none | Dec 18 |
| 2018 | no data | Nov 13 | no data | Nov 14 |
| 1970 | Feb 10 | Nov 16 | Feb 4 | Nov 16 |
| 1969 | Jan 12 | Nov 15 | Jan 12 | none |
| 1968 | no data | Nov 12 | no data | Dec 24 |
| 1967 | Feb 23 | Dec 3 | Feb 9 | Dec 23 |
| 1966 | Mar 6 | Nov 3 | Mar 6 | Dec 11 |
| 1965 | Mar 21 | Nov 30 | Mar 20 | none |
| 1964 | Mar 10 | Dec 1 | Feb 23 | Dec 14 |
| 1963 | Mar 6 | Dec 3 | Feb 14 | Dec 22 |
| 1962 | Mar 16 | Dec 6 | Mar 2 | none |
| 1961 | Feb 25 | Dec 12 | Jan 30 | Dec 13 |
| 1960 | Mar 3 | Dec 16 | Feb 25 | Dec 17 |
| 1959 | Mar 6 | Nov 7 | Mar 6 | Nov 7 |
| 1958 | Feb 16 | Dec 11 | Feb 13 | Dec 14 |
| 1957 | Jan 18 | Dec 1 | Jan 18 | Dec 12 |
| 1956 | Mar 8 | none | Feb 4 | none |
| 1955 | Mar 28 | Nov 29 | Feb 12 | none |
| 1954 | Feb 8 | Dec 30 | none | none |
| 1953 | Jan 17 | Dec 10 | none | Dec 23 |
| 1952 | Mar 24 | Dec 15 | none | none |
| 1951 | Mar 13 | Nov 3 | Feb 16 | Nov 3 |
"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.