Issue 4, May 23, 2017

Modified Growing Degree Days (Base 50°F, March 1 through May 18)

Station Location

Actual Total

Historical Average (11 year)

One-Week Projection

Two-Week Projection

Freeport

378

348

454

541

St. Charles

370

333

440

520

DeKalb

389

384

472

565

Monmouth

560

435

645

741

Peoria

646

470

732

831

Champaign

564

476

657

762

Springfield

564

476

657

762

Perry

733

506

824

927

Brownstown

783

587

890

1009

Belleville

814

616

925

1046

Rend Lake

870

668

987

1116

Carbondale

827

632

938

1062

Dixon Springs

917

684

1033

1161

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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