Illinois Climate

1. Illinois Climate

2. Tree Distributions – Post-Glacial

3. Mean Monthly Temperatures – Urbana, Illinois

4. Illinois Climate Basics – mean from 1961-1990 • Mean annual temperature ranges from 47 F in the north to 59 F in the south. • The mean January temperature ranges from 22 F in the north to 36 F in the south. • The mean July temperature ranges from 73 F in the north to 80 F in the south. • The average length of the growing season ranges from less than 160 days in the northwestern corner of the state to more than 200 days in the southern tip of the state. • Average annual precipitation increases from about 32 inches (81 cm) in the north to 47 inches (119 cm) in the south.

5. Illinois Climate

7. Climate Migration

10. Typical Driftless Region Topography

11. Jeweled shooting star – Wisconsin Driftless Region

12. Woodland white violet – Wisconsin Driftless Region

14. Rock River Hills

15. Prairie Dropseed – Rock River Hill Country

16. Yellow Birch – Rock River Hill Country

18. Lake in the Hills Fen - Illinois

19. Pitcher Plants – Northeastern Moraine

20. Volo Bog - Illinois

22. Nachusa Grasslands

23. Leadplant - Grand Prairie

24. Illinois Grand Prairie

27. Illinois and Mississippi River Bottomlands

28. Illinois and Mississippi River Bottomland Forest

29. Skunk cabbage – Upper Mississippi River and Illinois River Bottomlands

30. Bottomland Topography

32. Sand Prairie Habitat

33. Hairy Grama Grass – Illinois River and Mississippi R. Sand Areas

34. Blackjack oak - Illinois River and Mississippi R. Sand Areas

36. Western Forest Prairie Division

37. White Oak - Western Forest Prairie Division

39. Mississippi River Bluffs – Middle Mississippi Division

40. Basswood - Middle Mississippi Division

41. Purple Prairie Clover – Middle Mississippi Division