Warmer and Mostly Wetter July (so far)

The statewide average temperature for July 1-22, 2010, in Illinois is 77.2 degrees, 1.1 degrees above normal for this time period. The state average precipitation for the same period is 3.46 inches, 0.70 inches above normal.
Northern and eastern Illinois are a little drier on average. However, even those drier areas contain locations with very impressive rainfall amounts.

Midwest Rainfall
Midwestern rainfall for the period July 1-21, 2010. Map courtesy of NOAA's Midwestern Regional Climate Center.

Table 1. Temperature and precipitation amounts and departures from normal by climate division in Illinois for July 1-22, 2010. A map of the climate divisions can be seen below the table.

Climate Division Temperature (F) Depart (F) Rainfall (in) Depart (in)
Northwest 75.2 1.2 1.96 -0.86
Northeast 76.2 2.3 1.44 -1.41
West 76.9 0.4 6.54 3.58
Central 76.7 1.1 2.85 0.04
East 76.2 1.2 2.08 -0.88
South Southwest 77.5 0.4 5.05 -0.88
South Southeast 78.0 0.9 5.10 2.25
Southwest 79.3 1.0 2.89 0.39
Southeast 79.3 1.0 2.90 0.39
State 77.2 1.1 3.46 0.70
Illinois Climate Divisions
Illinois Climate Divisions (coincides with crop reporting districts as well).

June Rainfall Totals in Illinois

Here are the June 2010 rainfall totals for sites in Illinois, ranked from highest to lowest. The numbers are impressive with 35 sites scattered throughout northern and central Illinois reporting 10 or more inches of rain.
These numbers are preliminary and have not been quality-controlled. In some cases data may be missing that could lead to totals that are too low. Due to the localized nature of some of the heavier storms, one may see large differences over short distances. These sites are part of the NWS cooperative observer program – volunteers with standard equipment and observing practices.

June 2010 Rainfall Totals
Site Amount (in)
ST DAVID 13.75
BENTLEY 13.69
GALESBURG 13.24
VANDALIA 11.91
MOWEAQUA 2S 11.88
BRADFORD 3SSE 11.85
OGDEN 11.63
MILFORD 5 NW 11.61
PERRY 6 NW 11.57
ALTONA 11.56
STANFORD 2S 11.39
DAHINDA 11.31
KNOXVILLE 11.28
SHELBYVILLE DAM 11.19
FARMER CITY 3W 10.99
LINCOLN 10.80
CENTRAL ILLINOIS NWFO 10.79
HAVANA 10.58
PANA 10.52
CHICAGO MIDWAY AP 3 SW 10.50
SIDELL 5 NW 10.48
SPRINGFIELD #2 10.46
DECATUR 10.45
EARLVILLE 3 S 10.40
PRAIRIE CITY 2S 10.40
STREATOR 10.39
MARIETTA 10.36
SHERMAN 1 ESE 10.34
KANKAKEE METRO WWTP 10.22
CAMP GROVE 10.13
OAK BROOK 2W 10.09
ST ANNE 10.06
PLAINFIELD 3 NE 10.01
JACKSONVILLE 2 E 10.00
MORRIS 10.00
WINDSOR 9.94
BOURBONNAIS 3 NW 9.92
EFFINGHAM 9.92
LA GRANGE 9.78
MATTOON 9.78
KEWANEE 1 E 9.71
MARSEILLES LOCK 9.69
EFFINGHAM SE 9.66
HUTSONVILLE PWR PL 9.56
GRIGGSVILLE 9.50
CLINTON 1 SSW 9.48
DECATUR AP 9.36
RANTOUL 9.36
MENDOTA 2 SE 9.33
TAYLORVILLE 9.29
VIRGINIA 9.25
FISHER 9.24
OTTAWA 9.23
WHEATON 3 SE 9.19
JACKSONVILLE 2 9.14
BLOOMINGTON 5W 9.04
MARTINSVILLE 10S 9.03
ALEDO 9.01
HIDALGO 3SW 9.00
CHATSWORTH 8.94
SHABBONA 3S 8.90
PRINCEVILLE 2W 8.87
PARIS WTR WKS 8.82
CHAMPAIGN WILLARD AP 8.78
SPARLAND 6 SW 8.78
MT CARROLL 8.75
Moline Area 8.67
MOLINE QUAD CITY INTL AP 8.67
NEWARK 2 SSE 8.64
YORKVILLE 3 SW 8.41
NEOGA 4NW 8.40
CHARLESTON 8.38
KINCAID 8.38
PLANO 8.38
ATHENS 2SW 8.33
URBANA 8.33
ROMEOVILLE LEWIS UNIV AP 8.29
PERU 8.27
DANVILLE SEWAGE PLAN 8.26
LAKE SPRINGFIELD 8.26
PAW PAW 8.22
ATHENS 2 N 8.21
DWIGHT 8.20
WINCHESTER 8.20
WATSEKA 2 NW 8.19
Springfield Area 8.15
SPRINGFIELD CAPITAL AP 8.15
SULLIVAN 8.13
RAMSEY 8.09
ARTHUR 1W 8.08
PEORIA 5NW 8.05
LACON 1 N 7.92
ROSCOE 2 SE 7.76
CASEY 7.72
MACKINAW 7.70
NEWMAN 3W 7.70
CHICAGO MIDWAY AP 7.68
RANKIN 7.61
WHITE HALL 1 E 7.61
MONEE RSVR 7.48
MATTOON COLES CO AP 7.45
WOODSTOCK 5 NW 7.45
MT OLIVE 1 E 7.38
GLEN ELLYN 4 S 7.35
PARK FOREST 7.35
DANVILLE 7.28
NORMAL 4NE 7.21
PALESTINE 2W 7.19
QUINCY RGNL AP 7.19
HIGHLAND 7.11
MCHENRY STRATTON L&D 7.10
PAXTON 7.08
NEOGA 7.05
ELBURN 7.03
PITTSFIELD #2 7.02
ROANOKE 7.01
TUSCOLA 6.99
BEECHER CITY 6.97
SPRING GROVE 6.96
MORRISONVILLE 6.95
MARENGO 6.94
CONGERVILLE 2 NW 6.90
MUNDELEIN 4 WSW 6.89
CHANNAHON DRESDEN ISLAND 6.85
ROBINSON 6.84
MORTON 6.81
ST CHARLES 7 NW 6.78
NEWTON 6.70
EUREKA 6.62
HOOPESTON 1 NE 6.61
BEARDSTOWN 6.58
Peoria Area 6.54
PEORIA GTR PEORIA AP 6.54
DE KALB 6.53
AMBOY 6.52
FLORA 6.51
TRIMBLE 1E 6.49
ELIZABETH 6.42
WEST CHICAGO DUPAGE AP 6.42
BELVIDERE 6.39
CENTRALIA 6.28
JERSEYVILLE 2 SW 6.27
STEWARD 3S 6.21
ROCHELLE 6.19
Chicago Area 6.17
CHICAGO OHARE INTL AP 6.17
MONMOUTH 4 NW 6.16
BARRINGTON 3 SW 6.15
MINONK 6.13
Rockford Area 6.13
ROCKFORD GTR ROCKFORD AP 6.13
JOLIET BRANDON RD DM 6.09
LAWRENCEVILLE 6.06
NASHVILLE 1 E 5.86
NEW ATHENS 5.80
LOUISVILLE 5.75
SALEM 5.75
CHICAGO WAUKEGAN RGNL AP 5.74
CHICAGO BOTANICAL GARDEN 5.66
STREAMWOOD 5.59
HARVARD 5.57
LAWRENCEVILLE INTL AP 5.08
EDWARDSVILLE 2 W 5.02
KASKASKIA RIV NAV LO 4.97
CARLYLE RSVR 4.96
CHICAGO AURORA MUNI AP 4.94
CHENOA 4.81
OLNEY 2S 4.81
ALTON MELVIN PRICE 4.68
SMITHLAND L&D 4.66
MT VERNON 3 NE 4.63
BELLEVILLE SCOTT AFB 4.54
BLOOMINGTON WATRWRKS 4.52
ELGIN 4.21
BELLEVILLE SIU RSRCH 4.08
IUKA 3.83
GRAYVILLE 3.43
CARBONDALE SOUTHERN IL AP 3.34
GRAND CHAIN DAM 53 3.18
SHAWNEETOWN OLD TOWN 3.15
FAIRFIELD RADIO WFIW 3.11
CHICAGO PALWAUKEE AP 3.06
BROOKPORT DAM 52 2.73
CAHOKIA ST LOUIS AP 2.66

2nd Wettest June on Record

Illinois has experienced the 2nd wettest June on record, based on preliminary records through June 30. The statewide average rainfall was 7.8 inches, 3.7 inches above normal. The wettest June on record was 1902 with 8.37 inches. The rains over the weekend, especially north of I-80 and along I-70 caused this June to move up from fourth to second wettest June on record. Statewide records extend back to 1895. This number is provisional and may change slightly as more data comes in.
The larger rainfall totals occurred in the northern two-thirds of the state where amounts of 7 to 12 inches were common.  Meanwhile far southern Illinois remains closer to normal with amounts ranging from 3 to 6 inches.

Monitoring US and Global Climate Conditions

NOAA has an excellent website for monitoring global and U.S. conditions at http://www.ncdc.noaa.gov/climate-monitoring/index.php This site gives an overview of temperatures, precipitation, global hazards, tornadoes, wildfires, droughts, and other conditions for each month. The monthly reports are typically posted about a week or so after the end of the month. You can choose from the archive of past months/years as well.
Here is a screen shot of one of the many products available. This one is called the “U.S. Climate at a Glance” product. With this particular product you can generate national, regional, statewide maps as well as plots for key cities. Give it a try.

U.S. Climate at a Glance
Screenshot of U.S. Climate at a Glance product from NCDC showing April temperature departures.