Issue 5, May 23, 2016

Modified Growing Degree Days (Base 50°F, March 1 through May 21)

Station Location

Actual Total

Historical Average   (11 year)

One- Week Projection

Two-Week Projection

Freeport

356

358

434

523

St. Charles

338

342

410

492

DeKalb

364

394

448

543

Monmouth

452

447

537

637

Peoria

471

481

558

660

Champaign

502

488

596

704

Springfield

578

546

682

797

Perry

564

518

656

761

Brownstown

545

600

654

775

Belleville

754

630

866

989

Rend Lake

756

682

875

1005

Carbondale

719

645

832

957

Dixon Springs

742

698

860

990

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

Return to table of contents