Click on this link for: Probabilistic Freeze / Frost Occurrence Data: DVN
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| Freeze Dates | Spring-Last Occurrence | Fall-First Occurrence |
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| 1971-2000 | 32° | 28° | 32° | 28° |
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| Location | Earliest | Latest | Earliest | Latest | Earliest | Latest | Earliest | Latest |
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| Iowa |
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| Anamosa 1WNW | 04/14 | 05/30 | 03/24 | 05/15 | 09/09 | 10/17 | 09/20 | 10/30 |
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| Belle Plaine | 04/06 | 05/16 | 03/25 | 05/07 | 09/18 | 10/30 | 09/19 | 11/04 |
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| Bellevue L&D 12 | 04/09 | 05/29 | 03/27 | 05/08 | 09/19 | 10/30 | 09/23 | 11/05 |
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| Burlington Radio KBUR | 03/24 | 05/06 | 03/24 | 04/27 | 09/27 | 11/07 | 10/02 | 11/19 |
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| Cascade | 04/10 | 05/28 | 03/25 | 05/10 | 09/12 | 10/17 | 09/22 | 11/05 |
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| Cedar Rapids #1 | 03/26 | 05/16 | 03/24 | 05/06 | 09/19 | 10/30 | 09/30 | 11/07 |
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| Cedar Rapids AP | 03/29 | 05/08 | 03/27 | 04/25 | 09/19 | 10/31 | 09/30 | 11/11 |
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| Clinton#1 | 04/04 | 05/16 | 03/24 | 05/07 | 09/19 | 11/03 | 09/30 | 11/11 |
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| Columbus Junct. 1N | 03/24 | 05/15 | 03/23 | 04/29 | 09/18 | 10/30 | 09/19 | 11/11 |
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| Dubuque Airport | 03/29 | 05/16 | 03/24 | 05/07 | 09/20 | 11/01 | 09/30 | 11/12 |
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| Dubuque L&D 11 | 03/24 | 05/15 | 03/19 | 04/18 | 09/24 | 11/12 | 10/10 | 11/16 |
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| Fairfield | 03/27 | 05/08 | 03/24 | 05/02 | 09/15 | 11/03 | 10/02 | 11/12 |
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| Fort Madison | 03/24 | 05/14 | 03/18 | 04/18 | 09/23 | 11/15 | 10/02 | 11/21 |
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| Independence 2NNE | 03/27 | 05/16 | 03/24 | 05/06 | 09/15 | 11/01 | 09/20 | 11/01 |
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| Iowa City | 03/24 | 05/06 | 03/24 | 04/22 | 09/22 | 11/05 | 10/10 | 11/24 |
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| Keokuk L&D 19 | 03/25 | 04/22 | 03/16 | 04/18 | 09/25 | 11/12 | 10/11 | 12/11 |
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| Keosauqua State Park | 04/07 | 05/09 | 03/22 | 05/10 | 09/17 | 11/04 | 09/22 | 11/07 |
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| LeClaire L&D 14 | 03/24 | 05/07 | 03/23 | 04/22 | 09/30 | 11/12 | 10/02 | 11/19 |
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| Manchester #2 | 04/18 | 05/27 | 03/25 | 05/10 | 09/17 | 10/15 | 09/17 | 10/22 |
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| Maquoketa 3S | 03/20 | 05/30 | 03/17 | 05/17 | 09/17 | 11/02 | 09/22 | 11/05 |
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| Mt. Pleasant 1SSW | 03/28 | 05/16 | 03/24 | 04/25 | 09/19 | 11/15 | 10/02 | 11/16 |
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| Muscatine | 03/24 | 05/10 | 03/24 | 05/09 | 09/19 | 11/07 | 09/30 | 11/16 |
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| Sigourney | 03/25 | 05/07 | 03/23 | 04/28 | 09/22 | 11/05 | 10/02 | 11/16 |
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| Tipton 4NE | 03/30 | 05/29 | 03/24 | 04/25 | 09/19 | 10/30 | 09/19 | 11/05 |
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| Vinton | 04/09 | 05/16 | 03/24 | 05/06 | 09/16 | 10/30 | 09/21 | 11/04 |
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| Washington | 03/24 | 05/07 | 03/24 | 04/22 | 09/19 | 11/05 | 09/22 | 11/16 |
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| Williamsburg | 03/28 | 05/28 | 03/25 | 05/07 | 09/22 | 10/30 | 09/23 | 11/07 |
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| Illinois |
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| Aledo | 03/29 | 05/17 | 03/25 | 04/29 | 09/22 | 11/05 | 10/02 | 11/11 |
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| Elizabeth | 04/20 | 05/28 | 03/31 | 05/27 | 09/07 | 10/15 | 09/22 | 10/22 |
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| Freeport Waste Wtr Plt. | 04/08 | 05/17 | 03/24 | 05/10 | 09/20 | 10/21 | 09/23 | 11/10 |
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| Fulton L&D 13 | 03/25 | 05/06 | 03/23 | 04/24 | 09/20 | 11/14 | 10/04 | 11/20 |
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| Galva | 04/05 | 05/16 | 03/27 | 05/07 | 09/22 | 11/07 | 10/02 | 11/20 |
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| Geneseo | 03/26 | 05/17 | 03/24 | 04/29 | 09/23 | 11/10 | 10/02 | 11/17 |
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| Hennepin Power Plant | 04/09 | 05/29 | 03/29 | 05/09 | 09/11 | 11/03 | 09/23 | 11/13 |
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| Kewanee 1E | 04/09 | 05/16 | 03/28 | 05/08 | 09/22 | 11/04 | 09/23 | 11/17 |
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| LaHarpe | 04/02 | 05/11 | 03/24 | 05/06 | 09/21 | 11/03 | 10/01 | 11/12 |
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| Moline WSO AP | 04/09 | 05/16 | 03/24 | 04/29 | 09/20 | 11/03 | 10/02 | 11/12 |
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| Monmouth | 03/29 | 05/08 | 03/24 | 04/29 | 09/22 | 11/03 | 09/30 | 11/16 |
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| Morrison | 04/02 | 05/28 | 03/24 | 05/06 | 09/20 | 11/03 | 09/23 | 12/01 |
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| Mount Carroll | 04/19 | 05/31 | 04/06 | 05/29 | 08/28 | 10/15 | 09/07 | 11/01 |
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| Princeton | 03/27 | 05/07 | 03/24 | 04/18 | 09/23 | 10/27 | 10/07 | 11/19 |
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| Rock Island L&D 15 | 03/24 | 05/06 | 03/17 | 04/16 | 10/09 | 11/09 | 10/20 | 11/30 |
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| Stockton 3NNE | 04/13 | 05/17 | 03/26 | 05/08 | 09/17 | 11/01 | 09/22 | 11/12 |
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| Walnut | 03/29 | 05/27 | 03/27 | 05/03 | 09/20 | 11/03 | 10/02 | 11/14 |
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| Missouri |
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| Memphis | 03/30 | 05/13 | 03/16 | 04/29 | 09/18 | 11/04 | 10/02 | 11/16 |
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