Issue 6, May 31, 2016

Modified Growing Degree Days (Base 50°F, March 1 through May 26)

Station Location

Actual Total

Historical Average   (11 year)

One- Week Projection

Two-Week Projection

Freeport

466

412

551

656

St. Charles

435

392

513

611

DeKalb

477

454

569

679

Monmouth

568

506

663

778

Peoria

577

542

674

793

Champaign

598

554

701

826

Springfield

689

619

800

931

Perry

667

582

768

889

Brownstown

637

677

754

890

Belleville

858

708

978

1112

Rend Lake

855

765

982

1128

Carbondale

809

724

931

1069

Dixon Springs

832

781

958

1100

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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