There is an excellent article in the integrated pest management Bulletin at the University of Illinois by Emerson Nafziger about the damage of frost to corn this April and it’s impact on yield. You can read the full article at http://bulletin.ipm.illinois.edu/article.php?id=1619
Here are the low temperatures reported last week, sorted from coldest to not so coldest.
| Station Name | Low Temp(°F) | Month/Day |
| PAXTON | 20 | 11-Apr |
| CHAMPAIGN 9 SW | 21 | 11-Apr |
| PAW PAW | 23 | 11-Apr |
| JERSEYVILLE 2 SW | 23 | 17-Apr |
| MT CARROLL | 24 | 11-Apr |
| SIDELL 5 NW | 24 | 11-Apr |
| WATSEKA 2 NW | 24 | 11-Apr |
| LISLE-MORTON ARBORETUM | 25 | 11-Apr |
| SHABBONA 5 NNE | 25 | 10-Apr |
| ALTONA | 25 | 11-Apr |
| MONMOUTH 4 NW | 25 | 11-Apr |
| NORMAL 4NE | 25 | 11-Apr |
| CONGERVILLE 2 NW | 25 | 11-Apr |
| NORMAL 4NE | 25 | 11-Apr |
| PERRY 6 NW | 25 | 12-Apr |
| GALENA | 26 | 11-Apr |
| STOCKTON 3 NNE | 26 | 11-Apr |
| MARSEILLES LOCK | 26 | 11-Apr |
| LA HARPE | 26 | 11-Apr |
| PRINCEVILLE 2W | 26 | 11-Apr |
| DWIGHT | 26 | 11-Apr |
| HOOPESTON 1 NE | 26 | 11-Apr |
| NEOGA 4NW | 26 | 11-Apr |
| SULLIVAN | 26 | 11-Apr |
| ELIZABETH | 27 | 11-Apr |
| KEWANEE 1 E | 27 | 12-Apr |
| ROCKFORD GTR ROCKFORD AP | 27 | 11-Apr |
| DE KALB | 27 | 11-Apr |
| MCHENRY STRATTON L&D | 27 | 11-Apr |
| MUNDELEIN 4 WSW | 27 | 11-Apr |
| BENTLEY | 27 | 12-Apr |
| GALESBURG | 27 | 11-Apr |
| PRAIRIE CITY 2S | 27 | 11-Apr |
| CHENOA | 27 | 11-Apr |
| DANVILLE | 27 | 11-Apr |
| EFFINGHAM | 27 | 11-Apr |
| NEWTON | 27 | 11-Apr |
| PARIS WTR WKS | 27 | 11-Apr |
| TUSCOLA | 27 | 11-Apr |
| WINDSOR | 27 | 12-Apr |
| FREEPORT WWP | 28 | 11-Apr |
| HENNEPIN | 28 | 12-Apr |
| MOLINE QUAD CITY INTL AP | 28 | 12-Apr |
| ROCHELLE | 28 | 11-Apr |
| ROCHELLE | 28 | 11-Apr |
| BARRINGTON 3 SW | 28 | 11-Apr |
| ELGIN | 28 | 11-Apr |
| MARENGO | 28 | 11-Apr |
| MORRIS | 28 | 11-Apr |
| KNOXVILLE | 28 | 11-Apr |
| BLOOMINGTON 5W | 28 | 11-Apr |
| DECATUR | 28 | 11-Apr |
| MINONK | 28 | 11-Apr |
| OGDEN | 28 | 12-Apr |
| PONTIAC | 28 | 11-Apr |
| CARLINVILLE | 28 | 11-Apr |
| MORRISONVILLE | 28 | 11-Apr |
| SPRINGFIELD CAPITAL AP | 28 | 11-Apr |
| CHARLESTON | 28 | 11-Apr |
| PALESTINE 2W | 28 | 11-Apr |
| RAMSEY | 28 | 11-Apr |
| ROBINSON | 28 | 11-Apr |
| SHELBYVILLE DAM | 28 | 11-Apr |
| ALEDO | 29 | 11-Apr |
| CHICAGO BOTANICAL GARDEN | 29 | 11-Apr |
| OTTAWA | 29 | 11-Apr |
| ROMEOVILLE LEWIS UNIV AP | 29 | 11-Apr |
| QUINCY RGNL AP | 29 | 11-Apr |
| RUSHVILLE | 29 | 11-Apr |
| URBANA | 29 | 11-Apr |
| GRIGGSVILLE | 29 | 13-Apr |
| PITTSFIELD #2 | 29 | 12-Apr |
| SPRINGFIELD #2 | 29 | 11-Apr |
| WHITE HALL 1 E | 29 | 12-Apr |
| WINCHESTER | 29 | 11-Apr |
| HIDALGO 3SW | 29 | 11-Apr |
| PANA | 29 | 11-Apr |
| MT VERNON 3 NE | 29 | 12-A pr |
| GENESEO | 30 | 11-Apr |
| NEW BOSTON DAM 17 | 30 | 13-Apr |
| AURORA | 30 | 11-Apr |
| JOLIET BRANDON RD DM | 30 | 11-Apr |
| LITTLE RED SCHOOL HSE | 30 | 11-Apr |
| PARK FOREST | 30 | 11-Apr |
| PEORIA GTR PEORIA AP | 30 | 11-Apr |
| FISHER | 30 | 11-Apr |
| RANTOUL | 30 | 11-Apr |
| JACKSONVILLE 2 E | 30 | 12-Apr |
| OLNEY 2S | 30 | 11-Apr |
| TRIMBLE 1E | 30 | 11-Apr |
| VANDALIA | 30 | 11-Apr |
| CARBONDALE SEWAGE PLT | 30 | 12-Apr |
| SPARTA | 30 | 11-Apr |
| FAIRFIELD RADIO WFIW | 30 | 12-Apr |
| ILLINOIS CITY DAM 16 | 31 | 12-Apr |
| CHANNAHON DRESDEN ISLAND | 31 | 12-Apr |
| CHICAGO MIDWAY AP | 31 | 11-Apr |
| CHICAGO MIDWAY AP 3 SW | 31 | 11-Apr |
| KANKAKEE METRO WWTP | 31 | 11-Apr |
| FLORA | 31 | 12-Apr |
| IUKA | 31 | 11-Apr |
| BELLEVILLE SIU RSRCH | 31 | 12-Apr |
| DU QUOIN 4 SE | 31 | 12-Apr |
| ROCK ISLAND L&D 15 | 32 | 11-Apr |
| ROCK ISLAND L&D 15 | 32 | 11-Apr |
| CHICAGO OHARE INTL AP | 32 | 11-Apr |
| QUINCY DAM 21 | 32 | 12-Apr |
| STREATOR | 32 | 11-Apr |
| JACKSONVILLE 2 | 32 | 11-Apr |
| CARLYLE RSVR | 32 | 11-Apr |
| KASKASKIA RIV NAV LO | 32 | 12-Apr |
| LEBANON | 32 | 12-Apr |
| SMITHLAND L&D | 32 | 12-Apr |
| MORRISON | 33 | 17-Apr |
| GLADSTONE DAM 18 | 33 | 11-Apr |
| BIRDS 2E | 33 | 11-Apr |
| LAWRENCEVILLE | 33 | 11-Apr |
| SALEM | 33 | 11-Apr |
| NASHVILLE 1 E | 33 | 12-Apr |
| CAIRO 3 N | 34 | 12-Apr |
| GRAND CHAIN DAM 53 | 34 | 12-Apr |
| BROOKPORT DAM 52 | 34 | 12-Apr |
| ALTON MELVIN PRICE | 41 | 10-Apr |
| GRAYVILLE | 44 | 10-Apr |