county: ST. CHARLES | location: WELDON SPRING | lat: 38.699 | long: -90.683 | elev: 584 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 5/9 9/25 189 4/30 10/2 175 4/24 10/9 166 4/18 10/16 157 4/9 10/25 144
32 4/28 10/2 213 4/19 10/13 199 4/13 10/22 190 4/7 10/28 179 3/29 11/7 165
28 4/17 10/13 236 4/8 10/26 222 4/2 11/2 213 3/27 11/10 203 3/18 11/20 187
24 4/8 10/28 260 3/30 11/7 246 3/23 11/16 237 3/16 11/24 226 3/7 12/3 211

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