Issue 10, June 29, 2015

Modified Growing Degree Days (Base 50°F, March 1 through June 25)

Station Location

Actual Total

Historical Average (11 year)

One- Week Projection

Two-Week Projection

Freeport

1061

917

1217

1371

St. Charles

1056

865

1204

1353

DeKalb

1058

978

1217

1371

Monmouth

1220

1041

1378

1538

Peoria

1289

1095

1458

1629

Champaign

1347

1132

1520

1695

Springfield

1461

1222

1642

1829

Brownstown

1385

1298

1569

1759

Belleville

1544

1312

1726

1915

Rend Lake

1663

1421

1853

2049

Carbondale

1578

1342

1756

1941

Dixon Springs

1589

1414

1770

1957

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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