168 



ENVIRONMENTAL CONDITIONS. 



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

 United States. (Plate 34.) — Continued. 



Station. 



Idaho — Continued: 



Boise (22) 



Burnside (22) 



Chesterfield (H) . . . 



Coeur d'Alene (21) . 



Forney (21) 



Garnet (22) 



Grangeville (21) . . . 



Idaho Falls (22) . . . 



Kellogg (21) 



Lake (22) 



Lakeview (21) 



Landore (22) 



Lewiston (21) 



Lost River (22) .... 



Martin (22) 



Milner (22) 



Moscow (21) 



Murray (21) 



Oakley (22) 



Ola (22) 



Orofino (21) 



Paris (22) 



Payette (22) 



Pocatello (22) 



Pollock (21) 



Porthill (21) 



Priest River (21) . . . 



Roosevelt (21) 



St. Maries (21) 



Salmon (21) 



Soldier (22) 



Swan "Valley (22) . . 



Vernon (22) 



Warren (21) 



Weston (22) 



Illinois : 



Albion (66) 



Aledo (64) 



Alexander (65) .... 



Antioch (64) 



Ashton (64) 



Aurora (64) 



Benton (66) 



Bloomington (65) . . 



Bushnell (65) 



Cairo (66) 



Cambridge (64) 



Carlinville (65) 



Charleston (65) 



Chicago (64) 



Coatsburg (65) .... 



Cobden (66) 



Decatur (65) 



Dixon (64) 



Equality (66) 



Altitude. 



feet. 

 2,770 

 5,500 

 5,425 

 2,157 



2,575 

 3,500 

 4,742 

 2,330 

 6,700 

 2,250 

 5,300 

 757 

 5,700 

 5,600 

 4,097 

 2,748 

 2,750 

 4,191 

 3,100 

 1,027 

 5,946 

 2,159 

 4,483 

 2,050 

 1,665 

 2,078 

 7,250 

 2,263 

 4,040 

 5,140 

 5,434 



6,350 

 4,610 



631 



738 

 670 

 861 

 830 

 687 

 598 

 840 

 662 

 369 

 824 

 663 

 720 

 824 

 738 

 656 

 685 

 725 

 421 



No. of 

 years of 

 record. 



10 

 9 



6 



9 



9 



7 



4 



4 



11 



12 



4 



8 



10 



4 



6 



16 



15 



15 



9 



4 



13 



15 



9 



12 



16 



6 



6 



12 



3 



11 



8 



11 



4 



11 



15 

 8 

 15 

 7 

 14 

 22 

 7 

 16 

 14 

 38 

 14 

 17 

 16 

 38 

 13 

 13 

 15 

 17 

 10 



Average date of — 



Last frost 

 in spring. 



9 

 17 



20 

 26 



Apr. 28 



June 10 



July 21 



Apr. 31 

 Jiily 

 Apr. 



May 19 



May 22 



May 14 



June 25 



Apr. 29 



May 18 



Apr. 8 



June 9 



June 26 



May 19 



May 8 



June 2 



May 31 



May 25 



May 18 



June 14 



May 11 

 Apr. 

 Apr. 



May 14 



May 29 



June 29 



May 8 



May 26 



June 27 



June 28 



June 14 



June 12 



June 2 



Apr. 14 



Apr. 29 



Apr. 24 

 May 

 Apr. 



May 6 



Apr. 21 



Apr. 27 



Apr. 25 



Mar. 30 



Apr. 22 



Apr. 22 



Apr. 24 



Apr. 16 



Apr. 24 



Apr. 12 



Apr. 23 



Apr. 27 



Apr. 14 



4 

 29 



First frost 

 in autumn, 



Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 

 Oct. 



10 

 1 



Oct. 22 



Sept. 9 

 Aug 

 Oct. 



Aug. 17 



Oct. 20 



Sept. 25 



Sept. 12 



Sept. 25 



Aug. 20 



Oct. 9 



Aug. 16 



Oct. 27 



Sept. 1 



Aug. 24 



Oct. 4 



Oct. 10 



Sept. 19 



Sept. 12 

 Oct. 

 Oct. 

 Sept. 



Sept. 29 



Oct. 12 



Oct. 12 



Sept. 14 



Sept. 22 



Aug. 21 



Sept. 14 



Sept. 7 



Aug. 19 



Aug. 15 



Aug. 29 



July 23 



Sept. 9 



Oct. 21 



Oct. 13 



4 



12 



3 



6 



5 



5 



6 



21 



9 



14 



28 



10 



11 



6 



16 



Oct. 14 

 Oct. 21 



Oct. 

 Oct. 

 Oct. 



12 



6 



22 



Length of 

 average 

 frostless 

 season. 



days. 

 177 



91 



20 

 154 



39 

 186 

 129 

 113 

 134 



56 

 163 



90 

 202 



84 



59 

 138 

 155 

 109 

 104 

 132 

 147 



81 

 141 

 175 

 169 

 129 

 116 



63 

 129 

 104 



63 



48 



76 



41 



99 



190 

 167 

 165 

 164 

 159 

 153 

 183 

 165 

 172 

 212 

 171 

 172 

 165 

 182 

 173 

 192 

 172 

 162 

 191 



