Issue 8, June 15, 2015

Modified Growing Degree Days (Base 50°F, March 1 through June 4)

Station Location

Actual Total

Historical AverageĀ (11 year)

One- Week Projection

Two-Week Projection

Freeport

780

621

920

1076

St. Charles

779

585

910

1059

DeKalb

782

674

926

1086

Monmouth

911

736

1057

1216

Peoria

944

778

1095

1260

Champaign

994

803

1151

1322

Springfield

1101

883

1264

1441

Brownstown

1027

953

1192

1371

Belleville

1151

984

1305

1478

Rend Lake

1246

1063

1419

1605

Carbondale

1164

1008

1326

1499

Dixon Springs

1180

1074

1345

1520

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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