Issue 9, June 20, 2016

Modified Growing Degree Days (Base 50°F, March 1 through June 16)

Station Location

Actual Total

Historical Average (11 year)

One- Week Projection

Two-Week Projection

Freeport

900

739

1054

1210

St. Charles

848

696

994

1143

DeKalb

935

796

1094

1253

Monmouth

1076

860

1234

1393

Peoria

1077

906

1242

1410

Champaign

1093

936

1263

1436

Springfield

1235

1020

1411

1591

Perry

1197

951

1359

1524

Brownstown

1170

1092

1348

1531

Belleville

1431

1113

1602

1783

Rend Lake

1422

1208

1606

1796

Carbondale

1334

1143

1506

1682

Dixon Springs

1337

1212

1511

1691

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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