Issue 8, June 18, 2018

Modified Growing Degree Days (Base 50°F, March 1 through June 14)

Station Location

Actual Total

Historical Average (11 year)

One- Week Projection

Two-Week Projection

Freeport

876

678

1025

1182

St. Charles

883

639

1023

1173

DeKalb

842

733

995

1156

Monmouth

1068

796

1221

1381

Peoria

1082

840

1240

1408

Champaign

1145

868

1309

1482

Springfield

1320

950

1490

1669

Perry

1319

886

1476

1640

Brownstown

1262

1022

1434

1616

Belleville

1331

1048

1494

1673

Rend Lake

1407

1135

1586

1774

Carbondale

1311

1075

1478

1653

Dixon Springs

1366

1142

1537

1715

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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