Issue 8, June 14, 2016

Modified Growing Degree Days (Base 50°F, March 1 through June 9)

Station Location

Actual Total

Historical Average (11 year)

One- Week Projection

Two-Week Projection

Freeport

730

602

867

1022

St. Charles

687

568

805

961

DeKalb

763

655

904

1063

Monmouth

871

716

1014

1173

Peoria

875

758

1023

1187

Champaign

894

782

1047

1218

Springfield

1010

861

1170

1345

Perry

977

803

1125

1287

Brownstown

941

930

1103

1281

Belleville

1198

962

1350

1520

Rend Lake

1193

1038

1363

1547

Carbondale

1120

984

1279

1451

Dixon Springs

1135

1050

1297

1472

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