Issue 2, May 19, 2023
Modified Growing Degree Days
| Total | Historical Average (11 year) | One- Week Projection | |
|---|---|---|---|
| Freeport | 307 | 191 | 370 |
| St. Charles | 323 | 192 | 386 |
| DeKalb | 319 | 192 | 383 |
| Monmouth | 421 | 277 | 500 |
| Peoria | 424 | 305 | 501 |
| Champaign | 457 | 332 | 532 |
| Springfield | 481 | 404 | 560 |
| Perry | 496 | 379 | 573 |
| Brownstown | 580 | 389 | 660 |
| Belleville | 573 | 479 | 661 |
| Rend Lake | 592 | 530 | 684 |
| Carbondale | 602 | 505 | 696 |
| Dixon Springs | 596 | 533 | 692 |
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).