Issue 3, May 15, 2017

Modified Growing Degree Days (Base 50°F, March 1 through May 11)

Station Location

Actual Total

Historical Average (11 year)

One-Week Projection

Two-Week Projection

Freeport

244

247

314

387

St. Charles

248

239

313

381

DeKalb

251

275

326

405

Monmouth

394

315

478

562

Peoria

468

347

555

640

Champaign

402

348

491

582

Springfield

537

391

635

736

Perry

544

376

634

724

Brownstown

583

441

684

789

Belleville

610

465

715

823

Rend Lake

659

508

769

884

Carbondale

633

484

735

842

Dixon Springs

706

528

815

928

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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