Issue 7, June 8, 2015

Modified Growing Degree Days (Base 50°F, March 1 through June 4)

Station Location

Actual Total

Historical Avg.   (11 year)

One- Week Projection

Two-Week Projection

Freeport

629

511

738

878

St. Charles

624

483

726

857

DeKalb

630

559

745

889

Monmouth

747

617

866

1013

Peoria

779

655

902

1053

Champaign

821

674

950

1107

Springfield

916

748

1051

1214

Brownstown

854

813

994

1159

Belleville

963

848

1099

1253

Rend Lake

1053

914

1202

1375

Carbondale

981

866

1122

1284

Dixon Springs

998

928

1143

1308

Insect development is temperature dependent. We can use degree days to help predict insect emergence and activity. Home, Yard, and Garden readers can use the links below with the degree day accumulations above to determine what insect pests could be active in their area.

GDD of Landscape Pests
GDD of Conifer Pests

Degree day accumulations calculated using the Illinois IPM Degree-Day Calculator (a project by the Department of Crop Sciences at the University of Illinois and the Illinois Water Survey). (Kelly Estes)

Author:
Kelly Estes

Return to table of contents