county: ST. CHARLES | location: WELDON SPRING | lat: 38.699 | long: -90.683 | elev: 584 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 5/9 9/25 4/30 10/2 4/24 10/9 4/18 10/16 4/9 10/25
32 4/28 10/2 4/19 10/13 4/13 10/22 4/7 10/28 3/29 11/7
28 4/17 10/13 4/8 10/26 4/2 11/2 3/27 11/10 3/18 11/20
24 4/8 10/28 3/30 11/7 3/23 11/16 3/16 11/24 3/7 12/3

* 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%
36 189 175 166 157 144
32 213 199 190 179 165
28 236 222 213 203 187
24 260 246 237 226 211