county: MARION | location: HANNIBAL WTR WKS | lat: 39.723 | long: -91.372 | elev: 712 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 5/6 9/28 4/29 10/7 4/23 10/13 4/16 10/20 4/7 10/27
32 4/27 10/9 4/18 10/19 4/11 10/25 4/6 10/31 3/29 11/8
28 4/18 10/20 4/8 10/30 4/3 11/4 3/27 11/11 3/16 11/20
24 4/9 10/30 3/31 11/7 3/23 11/14 3/16 11/22 3/6 12/1

* 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%
36 194 181 172 164 151
32 216 204 195 186 173
28 238 225 216 207 193
24 259 245 236 226 212