162 



ENVIRONMENTAL CONDITIONS. 



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

 United States. (Plate 34.) — Continued. 



Station. 



Arizona: 



Arizona Canal Co. Dam (3) 



Benson (3) 



Casa Grande (3) 



Columbia (4) 



Congress (4) 



Dudleyville (3) 



Flagstaff (4) 



Ft. Apache (3) 



Fort Defiance (H) 



Fort Grant (3) 



Fort Hauchuca (3) 



Fort Mohave (4) 



Gila Bend (3) 



Grand Canon (4) 



Holbrook (4) 



Jerome (4) 



Keams Canyon (4) 



Kingman (4) 



Maricopa (3) , 



Oracle (3) 



Parker (4) 



Phoenix (3) 



Prescott (4) 



St. Johns (4) 



St. Michaels (4) 



San Simon (3) 



Seligman (4) 



Showlow (4) 



Signal (4) 



Supai (4) 



Tuba (4) 



Tucson (3) 



Willcox (3) 



Williams (4) 



Young (4) 



Arkansas: 



Amity (47) 



Arkadelphia (47) 



Batesville (48) 



Bee Branch (48) 



Brinkley (48) 



Camden (47) 



Conway (48) 



Corning (48) 



Dallas (H) 



Dodd City (48) 



Fayetteville (48) 



Forrest City (48) 



Fort Smith (47) 



Helena (48) 



Hope (47) 



Hot Springs (47) 



Jonesboro (48) 



LaCrosse (48) 



Little Rock (47) 



Altitude, 



feet. 

 1,372 

 3,523 

 1,396 

 1,900 

 3,688 

 2,360 

 6,907 

 5,200 

 6,850 

 4,916 

 5,100 

 604 

 737 

 6,866 

 5,069 

 4,743 

 3,326 

 3,326 

 1,173 

 4,500 

 345 

 1,108 

 5,320 

 5,650 

 6,950 

 3,609 

 5,219 

 6,300 

 1,652 

 3,200 

 4,500 

 2,390 

 4,164 

 6,750 

 4,400 



250 

 250 

 271 



226 



158 



309 



293 



1,100 



1,175 



1,461 



286 



461 



182 



377 



600 



345 



No. of 

 years of 

 record. 



10 



7 



5 



8 



8 



13 



11 



14 



14 

 13 



8 

 4 

 8 

 8 

 8 

 3 

 8 

 8 



13 

 8 

 8 

 8 

 8 

 8 

 5 

 4 

 4 

 5 

 3 

 8 



14 

 8 

 6 

 5 



12 

 10 

 10 

 12 

 12 

 12 

 12 

 12 



357 



12 

 12 

 11 

 27 

 12 

 5 

 5 

 12 

 12 

 30 



Average date of — 



Last frost 

 in spring. 



First frost 

 in autumn. 



1 



5 

 16 



27 



Feb. 15 



Mar. 20 



Mar. 5 



Mar. 20 



Feb. 20 



Mar. 30 



June 7 



May 10 



June 2 

 Apr 

 Apr 

 Feb 

 Jan. 



June 16 



May 19 



Apr. 8 



June 10 



Apr. 21 



Mar. 3 



Mar. 29 



Mar. 1 



Feb. 23 



May 21 



May 15 



June 7 



Apr. 3 



May 29 



Apr. 28 



Mar. 27 



Feb. 25 



May 1 



Mar. 26 



Apr. 11 



June 4 



May 14 



Apr. 13 



Mar. 26 



Apr. 9 



Apr. 8 



Mar. 27 



Mar. 17 



Mar. 27 



Mar. 28 



Apr. 4 



Apr. 20 



Apr. 14 



Mar. 28 



May. 21 



Mar. 22 



Mar. 7 



Apr. 1 



Mar. 30 



Apr. 9 



Mar. 19 



Dec. 18 



Nov. 10 



Nov. 22 



Nov. 22 



Nov. 30 



Nov. 13 



Sept. 20 



Oct. 13 



Sept. 23 



Nov. 26 



Nov. 28 



Nov. 21 



Nov. 28 



Sept. 25 



Oct. 5 



Nov. 6 



Sept. 24 



Nov. 8 



Nov. 23 



Dec. 4 



Nov. 22 



Dec. 3 



Sept. 29 



Sept. 29 



Sept. 17 



Oct. 23 



Sept. 26 



Oct. 9 



Nov. 13 



Nov. 18 



Oct. 3 



Nov. 22 



Nov. 5 



Sept. 22 



Oct. 2 



Oct. 28 



Nov. 8 



Nov. 2 



Oct. 31 



Oct. 28 



Nov. 9 



Nov. 4 



Oct. 20 



Nov. 4 

 Oct. 

 Oct. 

 Nov. 

 Nov. 

 Nov. 

 Oct. 



Length of 

 average 

 frostless 

 season. 



19 

 27 

 2 

 6 

 8 

 27 

 Oct. 26 

 Oct. 30 

 Oct. 29 

 Nov. 11 



days. 



296 



235 



262 



247 



283 



228 



105 



156 



113 



239 



237 



278 



305 



101 



139 



212 



106 



201 



265 



250 



266 



283 



131 



137 



102 



203 



120 



164 



231 



266 



155 



241 



208 



110 



141 



198 

 227 

 207 

 206 

 215 

 237 

 222 

 207 

 214 

 182 

 196 

 219 

 230 

 231 

 235 

 208 

 214 

 203 

 237 



