Issue 6, June 1, 2015

Modified Growing Degree Days (Base 50°F, March 1 through May 28)

Station Location

Actual Total

Historical Avg. (11 year)

One- Week Projection

Two-Week Projection

Freeport

532

424

619

729

St. Charles

534

403

614

716

DeKalb

537

467

630

745

Monmouth

647

520

744

863

Peoria

683

556

782

905

Champaign

721

569

826

956

Springfield

813

635

926

1061

Brownstown

760

694

879

1019

Belleville

857

727

978

115

Rend Lake

938

785

1067

1215

Carbondale

868

743

991

1133

Dixon Springs

879

801

1007

1152

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

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