Issue 2, April 25, 2016

Modified Growing Degree Days (Base 50°F, March 1 through April 21)

Station Location

Actual Total

Historical Average   (11 year)

One- Week Projection

Two-Week Projection

Freeport

155

107

192

247

St. Charles

153

108

187

238

DeKalb

158

123

198

258

Monmouth

203

150

247

311

Peoria

220

169

269

338

Champaign

243

169

292

361

Springfield

264

194

318

394

Perry

266

196

316

385

Brownstown

261

230

321

402

Belleville

351

247

413

495

Rend Lake

362

271

430

519

Carbondale

360

263

425

509

Dixon Springs

389

289

459

549

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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