Issue 4, May 27, 2014

Modified Growing Degree Days (Base 50°F,¬† March 1 through May 22)

Station Location

Actual Total

Historical Average (11 year)

One-Week Projection

Two-Week Projection

Freeport

412

358

490

579

St. Charles

332

342

403

486

DeKalb

338

395

422

517

Monmouth

414

447

500

599

Peoria

452

482

540

641

Champaign

475

489

569

677

Springfield

578

547

682

797

Brownstown

585

602

694

814

Belleville

628

632

740

863

Rend Lake

668

684

788

918

Carbondale

670

647

783

908

Dixon Springs

687

700

805

934

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 University of Illinois Department of Crop Sciences and the Illinois Water Survey). (Kelly Estes)

Author:
Kelly Estes

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