THE CLIMATE OF MICHIGAN. 



701 



Latitude 



Average date last killing frost in spring 

 Average date first killing frost in fall. . . 

 Average length of growing season 



Stations 



Humboldt 



46° 30'.. 

 June 11. 

 Aug. 27. 

 77 days . 



Adrian 



41° 50' 

 May 7 

 Oct. 25 

 171 days 



Elevation bas some bearing ou tbe lengtb of tbe growing season, but the 

 matter of air drainage as affected by local influences is more important. 

 A station on a hillside, which allows the cold air to drain off into a 

 valley beloAV, will escape frosts longer than a place situated at a lesser 

 altitude. 



The proximity of the lakes has a pronounced influence in preventing 

 early frosts in the fall. At Frankfort, on Lake Michigan, the average 

 date of the first killing frost in autumn is October 19, while at Grayling, 

 about the same distance north, but in the interior of the state the average 

 fall frost is more than a month earlier. Table IX and Charts XI, XII 

 and XIII show the dates of frost and length of the growing season. 



TABLE IX.— DATES OF KILLING FROST AND LENGTH OF GROWING SEASON. 



UPPER PENINSULA. 



Station 



Baraga 



Calumet . . 

 Chatham . . 

 E. Harbor. 

 Escanaba . 



Grand Marais . . 



Houghton 



Humboldt 



Iron Mountain. 

 Ironwood 



Iron River 



Ishpeming 



Mackinac Island. 

 Maple Ridge. . . . 

 Marquette 



Menominee 



Newberry 



St. Ignace 



Sault Ste. Marie. 

 Whitefish Point. , 



County 



Latest 

 date of 

 killing 

 frost in 

 spring 



Baraga June 27 . 



Houghton May 30. 



Alger June 28. 



Keweenaw • June 7 . 



Delta July 9. 



Alger 



Houghton. 

 Marquette. 

 Dickinson. 

 Gogebic. . . 



Iron 



Marquette. 



Delta 



Marquette. 



Menominee. 



Luce 



Mackinac. . 

 Chippewa. . 

 Chippewa . . 



June 1 . 

 May 27. 

 June 28. 

 June 15. 

 June 13. 



July 23. 

 June 18. 

 June 20. 

 June 27. 

 June 11. 



June 21. 

 June 20. 

 June 28. 

 May 28. 

 May 28. 



Earliest 

 date of 

 killing 

 frost in 

 autumn 



Aug. 2 . 

 Aug. 26. 

 July 16. 

 Sept. 13. 

 July 21. 



Sept. 12. 

 Sept. 22. 

 July 16. 

 Aug 27. 

 Sept. 1. 



July 23. 

 July 26. 

 Sept. 21. 

 Aug. 27. 

 Aug. 22. 



Sept. 16. 

 Aug. 27. 

 Sept. 1. 

 Sept. 14. 

 Sept. 21. 



Average 

 date last 



killing 

 frost in 



spring 



Average 



date first 



killirg 



frost in 



autimin 



May 25. 

 May 17. 

 June 13. 

 May 23. 

 May 13. 



May 17. 

 May 12. 

 June 11. 

 May 20. 

 May 22. 



June 8 . 

 June 1. 

 May 18. 

 June 5. 

 May 13. 



May 13. 

 May 28. 

 May 13. 

 May 13. 

 May 20. 



Sept. 5. 

 Oct. 1. 

 Sept. 6. 

 Oct. 10. 

 Oct. 5. 



Oct. 10. 

 Oct. 10. 

 Aug. 27. 

 Sept. 25. 

 Sept. 24. 



Sept. 9. 

 Sept. 17. 

 Oct. 11. 

 Sept. 11. 

 Oct. 7. 



Oct. 10. 

 Sept. 19. 

 Oct. 6. 

 Oct. 2. 

 Oct. 13. 



Average 

 length of 

 the grow- 

 ing season 



in days 



103 

 137 

 85 

 140 

 145 



146 

 151 

 77 

 128 

 125 



93 

 107 

 146 



98 

 147 



150 

 105 

 146 

 142 

 146 



