Issue 2, May 12, 2022

Modified Growing Degree Days

Modified Growing Degree Days (Base 50⁰ F, March 1 through May 10)

Station Location
Total Historical Average   (11 year) One- Week Projection
Freeport 178 161 300
St. Charles 198 162 321
DeKalb 179 160 302
Monmouth 265 241 402
Peoria 291 265 428
Champaign 312 288 448
Springfield 340 353 480
Perry 354 334 496
Brownstown 460 339 600
Belleville 451 425 598
Rend Lake 502 470 644
Carbondale 524 451 672
Dixon Springs 539 478 686

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 Pest Degree-Day Calculator Calculator (a project by the Department of Crop Sciences at the University of Illinois and the Illinois Water Survey).

Author:
Kelly Estes

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