county: ST. LOUIS | location: ST LOUIS LAMBERT INTL AP | lat: 38.752 | long: -90.374 | elev: 531 ft.
Temp Freeze Dates (month/day)
Probability of later date in spring (through Jul 31) or earlier date in fall (beginning Aug 1) than indicated.*
10% 30% 50% 70% 90%
(°F) spring fall spring fall spring fall spring fall spring fall
36 4/26 10/9 4/19 10/18 4/12 10/24 4/7 10/29 3/30 11/6
32 4/18 10/19 4/9 10/28 4/3 11/3 3/29 11/9 3/20 11/18
28 4/8 10/31 3/31 11/7 3/24 11/13 3/18 11/21 3/9 12/1
24 3/31 11/7 3/20 11/18 3/14 11/26 3/7 12/2 2/27 12/12

* Probability of observing a temperature as cold or colder than the indicated threshold.

Temp (°F) Freeze Free Period
Probability of longer than indicated freeze free period (Days).
10% 30% 50% 70% 90%
36 213 201 193 184 173
32 234 221 213 205 192
28 256 244 234 225 212
24 279 265 256 246 232