Northern Illinois has been plagued by heavy rainfall in August 2007. Here is information on the events, including maps and data. A Illinois State Water Survey press release was issued here.
A portion of that release says, "Rainfall amounts in northeastern Illinois already have established this as the wettest August and wettest summer since regional records began in 1895. As of the morning of August 24, rainfall for northeastern Illinois (including those counties from Boone to LaSalle and eastward) averaged 11.32 inches, 8.10 inches above normal, and beating the 1987 record of 11.02 inches. Totals for June–August thus far in this area averaged 20.02 inches, 8.91 inches above normal, and beating the 1972 record of 19.26 inches" more...
Since that press release, rainfall totals have decreased slightly (see table below):
Illinois 8/ 1/2007 to 8/31/2007 Climate <------Temperature-----> <---------Precipitation---------> Division Actual Normal Dev Actual Normal Dev Percent ----------------------------------------------------------------------------- Northwest 74.1 71.5 2.6 7.17 4.40 2.77 163 Northeast 73.4 71.6 1.8 10.99 4.15 6.84 265 West 78.1 73.9 4.2 4.57 3.58 0.99 128 Central 76.8 73.0 3.7 4.16 3.60 0.55 115 East 75.8 72.4 3.4 4.73 3.77 0.96 125 West-southwest 80.1 74.6 5.4 1.66 3.23 -1.57 51 East-southeast 80.0 74.6 5.4 2.05 3.39 -1.34 60 Southwest 81.9 75.9 5.9 1.33 3.34 -2.01 40 Southeast 82.1 76.0 6.1 1.26 3.27 -2.01 38 State 77.9 73.6 4.2 4.31 3.65 0.66 118 Dev means Deviation From Normal, Percent means Percent of Normal
The first two maps are provided by the Midwestern Regional Climate Center while the third is provided by the National Weather Service.
NWS cooperative weather observer reports from 8/01/2007 To 8/31/2007. "Obs" means the observed precipitation, "Dev" means the deviation from the climate division normal for this period, and "Percen Avail Data" means the percent available data. An "na" means no data were available. State: Illinois Climate Division: 1 From 8/01/2007 To 8/31/2007 Station Percent Percent ID Precipitation Avail <--- Temperature ----> Avail Number Name Obs Dev Data High Low Mean Dev Data ------------------------------------------------------------------------------- 110072 ALEDO 7.96 3.85 100 84.6 67.0 75.8 2.8 81 110146 AMBOY 7.92 3.70 100 na na na na 00 110211 APPLE_RIVER_CANYON_ST_PK 9.30 4.85 100 na na na na 00 112348 DIXON_1_NW 7.35 3.02 100 82.9 64.6 73.8 2.5 100 112745 ELIZABETH 7.20 2.71 100 82.4 63.1 72.7 2.1 100 113262 FREEPORT_WASTE_WTR_PL 12.11 7.71 100 82.7 63.1 72.9 2.4 100 113290 FULTON_L&D_#13 3.45 -1.04 100 83.9 66.3 75.1 3.8 100 113312 GALENA 6.04 1.55 100 na na na na 00 113335 GALVA 6.98 2.87 100 84.9 65.4 75.2 2.7 100 113384 GENESEO 8.08 3.78 100 85.0 67.5 76.2 4.0 100 114013 HENNEPIN_WATER_TRTMT 8.92 4.93 100 86.1 66.0 76.0 3.9 100 114355 ILLINOIS_CITY_DAM_16 7.80 3.55 100 86.5 68.0 77.2 4.3 100 114710 KEWANEE_1_E 7.66 3.52 100 83.8 64.9 74.4 2.0 100 114879 LANARK 6.81 2.33 100 na na na na 00 115751 MOLINE_WSO_AP 7.34 3.05 100 86.3 68.2 77.2 4.7 100 115833 MORRISON 6.01 1.57 100 85.2 64.3 74.7 3.3 100 115901 MOUNT_CARROLL 5.52 1.01 100 84.7 63.7 74.2 3.3 100 116080 NEW_BOSTON_DAM_17 7.15 3.05 100 87.3 68.0 77.6 4.3 100 116490 OREGON_3_SW 8.29 3.93 100 na na na na 00 116661 PAW_PAW_2_NW 6.52 2.40 100 81.4 63.1 72.2 0.9 100 116897 POLO_5_NW 7.32 2.89 100 84.4 63.6 74.0 3.1 100 116998 PRINCETON 9.57 5.48 100 84.7 66.7 75.7 3.6 100 117014 PROPHETSTOWN 8.83 4.45 100 na na na na 00 117354 ROCHELLE 10.23 5.98 100 81.7 64.0 72.8 1.9 100 117370 ROCK_FALLS_3_NE 7.25 2.90 100 na na na na 00 117382 ROCKFORD_AIRPORT 13.98 9.68 100 83.8 65.3 74.5 4.0 100 117391 ROCK_ISLAND_L&D_15 6.10 1.79 100 85.4 69.7 77.5 5.2 100 117470 ROSCOE_2_SE 12.24 7.96 100 na na na na 00 117916 SHIRLAND 11.62 7.31 94 na na na na 00 118254 STEWARD_3S 10.53 6.35 100 na na na na 00 118293 STOCKTON_3_NNE 7.16 2.71 100 81.1 62.5 71.8 1.5 100 119469 WOODHULL 5.79 1.69 100 na na na na 00 State: Illinois Climate Division: 2 From 8/01/2007 To 8/31/2007 Station Percent Percent ID Precipitation Avail <--- Temperature ----> Avail Number Name Obs Dev Data High Low Mean Dev Data ------------------------------------------------------------------------------- 110203 ANTIOCH 11.42 7.12 100 81.1 65.0 73.1 2.5 100 110338 AURORA 9.20 5.03 100 83.0 66.6 74.8 3.2 100 110442 BARRINGTON_3SW 13.84 9.50 100 80.4 64.3 72.3 1.1 100 110583 BELVIDERE 15.29 10.97 100 na na na na 00 111420 CHANNAHON_DRESDEN_ISLAND 10.35 6.48 100 85.0 66.9 75.9 3.9 100 111497 CHICAGO_BOTANICAL_GARDEN 12.76 8.52 100 83.8 63.7 73.8 2.5 100 111549 CHICAGO_OHARE_AP 9.70 5.39 100 83.2 66.4 74.8 3.2 100 111550 CHICAGO_NORTHERLY_ISLAND na na 00 82.9 70.1 76.5 4.9 100 111577 CHICAGO_MIDWAY_AP_3SW 8.76 4.69 100 83.1 67.9 75.5 3.8 100 112048 CRYSTAL_LAKE_4_NW 12.12 7.80 100 na na na na 00 112223 DE_KALB 12.02 7.74 100 82.4 64.7 73.6 2.5 100 112510 EARLVILLE_3_S 10.65 6.59 100 na na na na 00 112709 ELBURN 9.06 4.82 100 na na na na 00 112736 ELGIN 15.69 11.35 100 83.2 63.7 73.4 2.1 100 113392 GENOA_2_SW 16.56 12.23 100 na na na na 00 113490 GLEN_ELLYN_4_S 8.28 4.08 100 na na na na 00 113902 HARVARD 11.55 7.24 100 na na na na 00 114530 JOLIET_BRANDON_RD_DAM 10.75 6.82 100 83.1 66.3 74.7 2.8 100 114816 LA_GRANGE 8.72 4.58 100 na na na na 00 114890 LANSING 6.77 2.86 100 na na na na 00 115110 LITTLE_RED_SCHOOL_HOUSE 9.68 5.60 100 na na na na 00 115313 MANHATTAN_4_SW 0.55 -3.24 100 na na na na 00 115326 MARENGO 14.19 9.87 100 83.3 63.8 73.5 2.9 100 115372 MARSEILLES_LOCK 14.46 10.56 100 84.4 64.6 74.5 2.4 100 115493 MCHENRY_WG_STRATTON_L&D 12.71 8.39 100 80.6 63.3 72.0 1.1 100 115562 MENDOTA__2_SE 10.91 6.81 100 na na na na 00 115763 MONEE_RESERVOIR 13.14 9.31 74 na na na na 00 115825 MORRIS_1_NW 12.59 8.72 100 85.1 67.2 76.2 4.1 100 115961 MUNDELEIN_4_WSW 12.48 8.16 100 82.0 63.8 72.9 1.8 100 116065 NEWARK_2_SSE 11.90 7.90 68 na na na na 00 116281 OAK_BROOK_2W 8.13 3.93 100 na na na na 00 116526 OTTAWA_5SW 14.27 10.34 100 84.0 66.3 75.1 3.1 100 116616 PARK_FOREST 6.88 2.99 94 85.0 65.9 75.4 3.7 71 116725 PEOTONE 16.06 12.27 100 na na na na 00 116753 PERU 11.66 7.67 100 84.7 65.4 75.0 3.0 100 116849 PLAINFIELD_3_NE 9.38 5.33 100 na na na na 00 116855 PLANO 10.86 6.77 100 na na na na 00 117457 ROMEOVILLE_WFO 9.76 5.75 100 83.2 66.3 74.7 2.9 100 117579 ST_CHARLES_2NW_RIVER 8.09 3.80 26 na na na na 00 117586 ST_CHARLES_7_NW 10.49 6.18 100 na na na na 00 117833 SHABBONA_3S 8.30 4.14 100 na na na na 00 118192 SPRING_GROVE 10.06 5.76 100 na na na na 00 118324 STREAMWOOD 11.79 7.45 100 86.9 61.9 74.4 2.9 100 119221 WHEATON_3_SE 5.56 1.37 81 83.9 63.2 73.5 1.8 81 119480 WOODSTOCK_5_NW 12.96 8.64 100 na na na na 00 119827 YORKVILLE_3_SW 11.17 7.12 87 na na na na 00 State: Illinois Climate Division: 3 From 8/01/2007 To 8/31/2007 Station Percent Percent ID Precipitation Avail <--- Temperature ----> Avail Number Name Obs Dev Data High Low Mean Dev Data ------------------------------------------------------------------------------- 110140 ALTONA 1.71 -2.37 39 na na na na 00 110330 AUGUSTA 2.87 -0.69 100 na na na na 00 110356 AVON_5_NE 4.59 0.87 100 na na na na 00 110598 BENTLEY 5.09 1.47 100 92.5 67.3 79.9 5.7 100 110987 BROOKLYN 1.68 -1.87 100 na na na na 00 111316 CARTHAGE 3.47 -0.18 100 na na na na 00 112125 DAHINDA_1_NE 5.37 1.46 100 na na na na 00 113320 GALESBURG 6.37 2.44 100 86.3 68.4 77.3 4.3 100 113455 GLADSTONE_DAM_18 6.14 2.22 100 87.5 68.4 77.9 4.4 100 113530 GOLDEN 2.67 -0.84 100 91.5 67.2 79.3 4.9 100 114780 KNOXVILLE 6.93 3.05 100 85.8 66.6 76.2 3.3 100 114823 LA_HARPE 4.96 1.24 100 89.3 65.4 77.3 3.6 100 115038 LEWISTOWN 2.56 -1.02 100 na na na na 00 115280 MACOMB 1.65 -2.00 100 na na na na 00 115334 MARIETTA 3.16 -0.47 29 na na na na 00 115768 MONMOUTH 6.34 2.42 97 88.1 67.1 77.6 4.4 100 115772 MONMOUTH_4NW 6.40 2.46 100 85.3 65.7 75.5 2.2 100 115935 MOUNT_STERLING 1.11 -2.35 100 na na na na 00 116670 PAYSON 3.76 0.30 100 na na na na 00 116970 PRAIRIE_CITY_2S 2.56 -1.10 100 89.0 67.7 78.4 5.0 100 117072 QUINCY_REGIONAL_AP 2.50 -0.96 100 91.0 68.7 79.9 5.2 100 117077 QUINCY_DAM_21 5.60 2.12 100 91.0 70.1 80.5 5.7 100 117278 RIPLEY 0.55 -2.93 16 na na na na 00 117551 RUSHVILLE 0.89 -2.62 100 90.6 67.3 79.0 4.9 100 118204 ST_DAVID 3.09 -0.50 100 na na na na 00 119816 YATES_CITY 4.85 1.11 100 na na na na 00 State: Illinois Climate Division: 4 From 8/01/2007 To 8/31/2007 Station Percent Percent ID Precipitation Avail <--- Temperature ----> Avail Number Name Obs Dev Data High Low Mean Dev Data ------------------------------------------------------------------------------- 110305 ATHENS_2_N 1.45 -2.16 90 na na na na 00 110306 ATHENS_2SW 2.78 -0.78 100 88.5 67.2 77.8 3.9 100 110761 BLOOMINGTON_WATERWORKS 2.04 -1.64 100 na na na na 00 110764 BLOOMINGTON_5W 1.61 -2.06 100 86.8 66.1 76.4 3.4 100 110868 BRADFORD_3SSE 5.26 1.25 100 na na na na 00 111083 BUFFALO 2.98 -0.66 100 na na na na 00 111236 CAMP_GROVE_2_SW 6.44 2.50 100 na na na na 00 111475 CHENOA 4.47 0.80 100 86.6 66.0 76.3 3.8 100 111627 CHILLICOTHE 6.96 3.16 100 na na na na 00 111743 CLINTON_1_SSW 1.90 -1.98 100 na na na na 00 111836 CONGERVILLE_2_NW 3.31 -0.30 100 88.5 65.5 77.0 4.1 100 112193 DECATUR 0.64 -3.13 90 na na na na 00 112197 DECATUR_4N 1.12 -2.73 90 92.9 65.7 79.3 5.5 100 112854 EUREKA 5.54 1.92 100 na na na na 00 112993 FARMER_CITY 1.48 -2.38 100 na na na na 00 113722 GROVELAND_2WNW 3.16 -0.46 100 na na na na 00 113940 HAVANA_4_NNE 2.54 -1.02 100 na na na na 00 114805 LACON_1_N 6.25 2.38 100 88.6 68.2 78.4 5.9 100 115041 LEXINGTON 3.91 0.27 100 na na na na 00 115079 LINCOLN 0.89 -2.86 100 na na na na 00 115272 MACKINAW_1N 2.60 -1.03 100 na na na na 00 115712 MINONK 7.72 4.00 100 86.4 65.4 75.9 3.4 100 115876 MORTON 2.91 -0.71 100 na na na na 00 115927 MOUNT_PULASKI 3.04 -0.78 100 na na na na 00 116200 NORMAL_4NE 2.57 -1.09 100 88.5 65.0 76.7 3.8 100 116703 PEORIA_AIRPORT_3SW 3.10 -0.52 100 na na na na 00 116711 PEORIA_GTR_PEORIA_RGNL_A 4.12 0.50 100 87.8 68.7 78.3 5.4 100 116760 PETERSBURG_3_SSW 2.99 -0.55 100 na na na na 00 116765 PETERSBURG_2SW 2.27 -1.27 100 na na na na 00 117004 PRINCEVILLE_2W 4.97 1.11 97 87.9 65.0 76.5 3.8 100 117329 ROANOKE 6.16 2.48 100 na na na na 00 117590 SAYBROOK_2N 2.98 -0.79 100 na na na na 00 118222 STANFORD_2S 1.56 -2.14 100 na na na na 00 118630 TOULON_2_SSW 6.87 2.87 100 na na na na 00 118797 VARNA 8.09 4.25 100 na na na na 00 118990 WASHINGTON_2_WSW 5.53 1.90 100 na na na na 00 State: Illinois Climate Division: 5 From 8/01/2007 To 8/31/2007 Station Percent Percent ID Precipitation Avail <--- Temperature ----> Avail Number Name Obs Dev Data High Low Mean Dev Data ------------------------------------------------------------------------------- 110803 BOURBONNAIS_3NW 10.18 6.40 100 na na na na 00 111447 CHATSWORTH 6.62 2.88 100 na na na na 00 111655 CISCO 1.29 -2.67 100 na na na na 00 112140 DANVILLE 3.03 -0.91 100 89.2 67.6 78.4 5.6 100 112145 DANVILLE_SEWAGE_PLANT 2.89 -1.07 100 na na na na 00 112500 DWIGHT 10.65 6.85 100 83.5 64.4 74.0 1.8 74 112923 FAIRBURY__WWTP 6.07 2.36 100 na na na na 00 113061 FISHER 1.53 -2.32 100 na na na na 00 113413 GIBSON_CITY 3.63 -0.16 100 86.0 66.1 76.0 3.3 100 113774 HAMMOND 2.11 -1.68 100 na na na na 00 114198 HOOPESTON_1_NE 4.46 0.60 100 88.5 66.3 77.4 5.1 100 114603 KANKAKEE_METRO_WASTWTR 6.14 2.36 77 na na na na 00 115292 MAHOMET 2.31 -1.58 100 na na na na 00 115646 MILFORD_5_NW 2.70 -1.11 100 na na na na 00 115758 MOMENCE_5_ENE 6.79 2.98 100 na na na na 00 115792 MONTICELLO_NO_2 1.87 -2.08 100 na na na na 00 116344 OGDEN 2.73 -1.21 100 na na na na 00 116663 PAXTON_2_WSW 4.35 0.52 100 86.3 64.1 75.2 2.6 100 116769 PHILO 3.00 -0.97 100 na na na na 00 116819 PIPER_CITY 8.79 5.03 100 86.1 64.1 75.1 2.9 100 116910 PONTIAC 7.21 3.48 100 85.5 67.6 76.6 4.2 100 117150 RANTOUL 1.51 -2.36 94 90.6 67.3 78.9 6.1 100 117952 SIDELL_5NW 1.67 -2.29 100 88.8 64.9 76.9 3.7 100 118194 ST_ANNE 9.28 5.48 100 na na na na 00 118353 STREATOR_3_SE 9.82 6.01 100 na na na na 00 118632 TOULON_2_SSE 6.87 2.87 100 na na na na 00 118740 URBANA 1.48 -2.46 100 88.8 67.5 78.1 4.9 100 118742 URBANA_2 2.19 -1.74 100 na na na na 00 118745 URBANA_S_AGRONOMY_FARM 2.22 -1.72 100 88.6 70.2 79.4 6.2 100 119021 WATSEKA_2_NW 4.73 0.93 100 85.5 64.2 74.8 2.8 100 Normals used for the deviations are from a grid and should only be considered as an approximation for a particular station