Issue 2, May 4, 2015

Modified Growing Degree Days (Base 50°F,  March 1 through April 29)

Station Location

Actual Total

Historical Avg.   (11 year)

One-Week Projection

Two-Week Projection

Freeport

189

151

248

316

St. Charles

179

148

234

298

DeKalb

178

170

241

314

Monmouth

240

203

307

388

Peoria

255

227

327

412

Champaign

252

227

327

412

Springfield

329

258

399

495

Brownstown

303

301

387

487

Belleville

367

321

453

556

Rend Lake

403

352

496

607

Carbondale

390

339

477

579

Dixon Springs

410

373

503

611

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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