county: ST. CHARLES | location: ST CHARLES | lat: 38.815 | long: -90.517 | elev: 467 ft.
Temp Probability of observing a temperature as cold, or colder, later in the spring or earlier in the fall than the indicated date.
10% 30% 50% 70% 90%
(°F) spring fall season
length*
spring fall season
length*
spring fall season
length*
spring fall season
length*
spring fall season
length*
36 5/7 9/28 193 4/30 10/6 180 4/24 10/12 171 4/17 10/19 162 4/8 10/27 149
32 4/27 10/7 216 4/18 10/17 203 4/12 10/24 194 4/6 10/31 185 3/27 11/8 172
28 4/17 10/19 240 4/7 10/30 227 4/1 11/4 218 3/24 11/11 208 3/15 11/22 195
24 4/5 10/31 266 3/27 11/9 252 3/19 11/17 242 3/13 11/26 232 3/3 12/5 217

*Season length: number of days between last spring and first fall temperature thresholds, i.e. 36, 32, 28 and 24°F.