178 



ENVIRONMENTAL CONDITIONS. 



Table 2. — Frost data and length of average frostless season for 1803 stations in the 

 United States. (Plate 34.) — Continued. 



Station. 



Altitude. 



No. of 

 years of 

 record. 



Average date of- 



Last frost 

 in spring. 



First frost 

 in autumn, 



Length of 

 average 

 frostless 

 season. 



Montana — Continued: 



Billings (26) 



Boulder (27) 



Busby (26) 



Butte (27) 



Canyon Ferry (27) . . 



Cascade (29) 



Chester (29) 



Chinook (30) 



Chouteau (29) 



Clear Creek (29) . . . . 

 Columbia Falls (28) . 



Copper (27) 



Crow Agency (26) . . 



Culbertson (30) 



Cut Bank (29) 



Dayton (28) 



Decker (26) 



Deer Lodge (28) .... 



Dillon (27) 



East Anaconda (28) . 



EkaJaka (26) 



Fallon (26) 



Forsyth (26) 



Fort Benton (29) . . . 



Fortine (28) 



Fort Logan (27) 



Fort Shaw (29) 



Glasgow (30) 



Glendive (30) 



Gold Butte (29) .... 



Great Falls (29) 



Hamilton (28) 



Harlowton (27) 



Havre (29) 



Helena (27) 



Huntley (26) 



Jordan (30) 



Kalispell (28) 



Lewistown (29) 



Livingston (27) 



Lodgegrass (26) 



Manhattan (27) .... 



Marysville (27) 



Miles City (26) 



Missoula (28) 



Ovando (28) 



Philipsburg (28) .... 



Plains (28) 



Pleasant Valley (28) . 



Poison (28) 



Poplar (30) 



Raymond (29) 



Red Lodge (26) 



Renova (27) 



Ridgelawn (30) 



feet. 

 3,115 

 920 



716 

 644 

 361 

 140 

 502 

 810 



100 



041 

 927 

 700 

 800 

 400 

 768 

 147 

 500 



208 

 514 

 630 

 975 

 000 

 500 

 092 

 069 



350 

 575 

 165 

 505 

 110 

 014 



965 

 010 

 488 

 441 

 292 

 360 

 371 

 212 

 207 

 275 

 475 

 500 

 920 

 020 

 260 

 548 

 383 

 915 



10 



8 



6 



14 



10 



6 



6 



10 



11 



4 



16 



4 



27 



7 



7 



6 



6 



8 



9 



4 



7 



4 



3 



9 



3 



12 



2 



14 



16 



3 



18 



7 



15 



11 



35 



3 



4 



12 



12 



8 



4 



8 



13 



18 



10 



10 



6 



10 



2 



2 



16 



3 



8 



10 



6 



May 7 



June 19 



June 3 



June 5 



May 13 



May 20 



May 23 



May 13 



May 30 



May 30 



June 9 



June 11 



May 15 



May 30 



June 14 



May 17 



May 23 



June 16 



June 9 



June 1 



May 22 



May 22 



May 9 



May 16 



May 31 



June 16 



May 10 



May 22 



May 12 



May 22 



May 7 



May 12 



June 6 



May 15 



May 7 



May 5 



May 10 



May 13 



June 5 



May 20 



May 18 



June 6 



June 8 



May 7 



May 13 



July 4 



June 1 1 



May 29 



July 10 



May 10 



May 16 



June 22 



June 13 



May 27 



May 13 



Sept. 16 



Sept. 5 



Sept. 17 



Sept. 15 



Sept. 18 



Sept. 19 



Sept. 13 



Sept. 11 



Sept. 6 



Sept. 26 



Aug. 22 



Aug. 3 



Sept. 26 



Sept. 5 



Aug. 29 



Sept. 15 



Sept. 7 



Sept. 6 



Sept. 1 



Sept. 14 



Sept. 22 



Sept. 29 



Sept. 29 



Sept. 30 



Aug. 6 



Aug. 30 



Sept. 16 



Sept. 12 



Sept. 22 



Sept. 1 



Sept. 16 



Sept. 24 



Sept. 4 



Sept. 14 



Sept. 28 



Sept. 29 



Sept. 13 



Sept. 30 



Sept. 3 



Sept. 17 



Sept. 21 



Aug. 27 



Sept. 11 



Sept. 24 



Sept. 19 



Aug. 12 



Aug. 15 



Sept. 19 

 Aug 

 Oct. 



Sept. 11 



Aug. 25 



Sept. 2 



Sept. 14 



Sept. 21 



4 

 14 



days. 

 132 



78 

 106 

 102 

 128 

 122 

 113 

 121 



99 

 119 



74 



53 

 134 



98 



76 

 121 

 107 



82 



84 

 105 

 123 

 130 

 143 

 137 



67 



75 

 129 

 113 

 133 

 102 

 132 

 135 



90 

 122 

 144 

 147 

 126 

 140 



90 

 120 

 126 



82 



95 

 140 

 129 



39 



65 

 113 



25 

 157 

 118 



64 



81 

 110 

 131 



