Taylor Frost Dates and Growing Season
Frost and the growing season
NOAA's 1991-2020 freeze probabilities for Dothan Rgnl AP. A median date has an even chance of a later freeze in spring, or an earlier one in fall.
The last spring freeze typically comes around March 1 and the first fall freeze around November 24, a growing season of about 270 days.
- Median at 36°F
- last March 15, first November 12
- Median at 32°F
- last March 1, first November 24
- Median at 28°F
- last February 12, first December 16
Last freeze in spring
The chance of a later freeze than the date shown. At 10 percent, one spring in ten still freezes after the date; planting after the 10 percent date for 32°F is the cautious choice.
| Threshold | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 1 | Mar 28 | Mar 23 | Mar 18 | Mar 15 | Mar 11 | Mar 7 | Mar 3 | Feb 23 |
| 32°F | Mar 21 | Mar 14 | Mar 10 | Mar 6 | Mar 1 | Feb 25 | Feb 20 | Feb 12 | Feb 3 |
| 28°F | Mar 11 | Mar 3 | Feb 27 | Feb 19 | Feb 12 | Feb 6 | Jan 31 | Jan 26 | Jan 14 |
| 24°F | Feb 26 | Feb 13 | Feb 6 | Feb 1 | Jan 29 | Jan 23 | Jan 17 | Jan 9 | Dec 30 |
| 20°F | Feb 9 | Feb 2 | Jan 29 | Jan 24 | Jan 18 | Jan 13 | Jan 8 | Jan 4 | Dec 30 |
| 16°F | Feb 1 | Jan 30 | Jan 25 | Jan 22 | Jan 18 | Jan 15 | Jan 10 | Jan 7 | Jan 3 |
First freeze in fall
The chance of an earlier freeze than the date shown. At 10 percent, one fall in ten freezes before the date.
| Threshold | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 30 | Nov 2 | Nov 6 | Nov 9 | Nov 12 | Nov 16 | Nov 19 | Nov 23 | Dec 1 |
| 32°F | Nov 7 | Nov 11 | Nov 15 | Nov 20 | Nov 24 | Nov 29 | Dec 3 | Dec 9 | Dec 24 |
| 28°F | Nov 17 | Nov 24 | Dec 1 | Dec 7 | Dec 16 | Dec 26 | Jan 1 | Jan 7 | Jan 17 |
| 24°F | Dec 2 | Dec 13 | Dec 25 | Dec 31 | Jan 4 | Jan 8 | Jan 14 | Jan 21 | Feb 3 |
| 20°F | Dec 22 | Dec 31 | Jan 3 | Jan 6 | Jan 9 | Jan 14 | Jan 19 | Jan 25 | Feb 3 |
| 16°F | Jan 2 | Jan 5 | Jan 8 | Jan 11 | Jan 15 | Jan 18 | Jan 22 | Jan 25 | Jan 31 |
Growing season length
Days between the last spring and first fall freeze at each threshold, with the chance of a season at least that long.
| Threshold | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | 269 | 259 | 253 | 247 | 242 | 237 | 232 | 225 | 219 |
| 32°F | 303 | 291 | 284 | 277 | 270 | 264 | 257 | 250 | 240 |
| 28°F | 339 | 328 | 320 | 311 | 304 | 298 | 289 | 280 | 267 |
| 24°F | 365 | 365 | 356 | 344 | 337 | 331 | 323 | 312 | 302 |
| 20°F | 365 | 365 | 365 | 365 | 365 | 363 | 354 | 341 | 330 |
| 16°F | 365 | 365 | 365 | 365 | 365 | 365 | 365 | 365 | 360 |
How often it gets that cold
The share of years with at least one night at or below each temperature.
- 36°F or colder
- 100% of years
- 32°F or colder
- 100% of years
- 28°F or colder
- 96% of years
- 24°F or colder
- 81% of years
- 20°F or colder
- 43% of years
- 16°F or colder
- 11% of years
Degree days
A degree day is one degree of the daily mean temperature beyond a base, for one day. Heating degree days count cold (the fuel a house burns), cooling degree days heat, growing degree days the warmth a crop needs; each crop has its own base.
- Heating degree days, base 65°F
- 1,633
- Cooling degree days, base 65°F
- 2,686
- Growing degree days, base 40°F
- 10,209
- Growing degree days, base 45°F
- 8,452
- Growing degree days, base 50°F
- 6,792
- Growing degree days, base 55°F
- 5,266
- Growing degree days, base 60°F
- 3,890
Growing degree days by month, base 50°F
Heating and cooling by month
| Month | Heating DD | Cooling DD | Growing DD 50 |
|---|---|---|---|
| January | 451 | 9 | 137 |
| February | 307 | 14 | 174 |
| March | 174 | 45 | 348 |
| April | 50 | 118 | 519 |
| May | 4 | 332 | 793 |
| June | 0 | 482 | 931 |
| July | 0 | 558 | 1,023 |
| August | 0 | 527 | 992 |
| September | 1 | 387 | 835 |
| October | 46 | 165 | 585 |
| November | 217 | 34 | 284 |
| December | 384 | 15 | 171 |
What this means
NOAA computes these from the daily lows at the station over 1991-2020, fitting the dates of each year's last and first freeze to a distribution, so a date can be stated at any level of risk. 36°F is a frost risk for tender plants on a clear, calm night, since the ground cools below the air above it; 32°F is a freeze; 28°F is a hard freeze that kills most annuals.
The station is 17.5 km from Taylor. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.
More
Sources
NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USW00013839 (Dothan Rgnl AP). Public domain.