county: ST. CHARLES | location: ST CHARLES | lat: 38.815 | long: -90.517 | elev: 467 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 5/7 9/28 4/30 10/6 4/24 10/12 4/17 10/19 4/8 10/27
32 4/27 10/7 4/18 10/17 4/12 10/24 4/6 10/31 3/27 11/8
28 4/17 10/19 4/7 10/30 4/1 11/4 3/24 11/11 3/15 11/22
24 4/5 10/31 3/27 11/9 3/19 11/17 3/13 11/26 3/3 12/5

* 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%
36 193 180 171 162 149
32 216 203 194 185 172
28 240 227 218 208 195
24 266 252 242 232 217