Issue 7, June 11, 2018

Modified Growing Degree Days (Base 50°F, March 1 through June 7)

Station Location

Actual Total

Historical Average (11 year)

One- Week Projection

Two-Week Projection

Freeport

747

554

871

1019

St. Charles

748

523

863

1003

DeKalb

715

605

844

997

Monmouth

909

664

1042

1195

Peoria

930

704

1066

1225

Champaign

976

726

1118

1283

Springfield

1128

802

1276

1446

Perry

1117

749

1254

1411

Brownstown

1070

870

1222

1394

Belleville

1120

904

1263

1426

Rend Lake

11489

974

1349

1529

Carbondale

1104

924

1254

1422

Dixon Springs

1163

988

1317

1487

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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