CLIMATIC CONDITIONS OF THE UNITED STATES. 



161 



cases frosts are so infrequent that no average dates can yet be obtained. 

 In such cases the words "very infrequent" are entered in these 

 columns. The frostless season should be considered as approximately 

 the entire year in these cases. Similarly, for a few stations the 

 words "possible throughout year" indicate that the data at hand 

 do not indicate any reliable average dates of last and first killing frosts 

 and that the average frostless season is either very short or absent. 

 For such stations the duration factor which we are considering should 

 be regarded as practically nil. The fifth column of table 2 gives the 

 average length of the frostless season (in days) for each station, this 

 being derived from the dates of the third and fourth columns, not 

 employing the first date, but including the last. 



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



United States. (Plate 34.) 



Station. 



Alabama : 



Anniston (82) a 



Asheville (82) 



Birmingham (81) . . . . 



Camp Hill (82) 



Clanton (82) 



Decatur (81) 



Eufaula (82) 



Evergreen (82) 



Flomaton (82) 



Florence (81) 



Gadsden (82) 



Goodwater (82) 



Greensboro (81) 



Healing Springs (81) . 

 Highland Home (82) . 



Livingston (81) 



Maple Grove (82) . . . 



Mobile (82) 



Montgomery (82) 



Oneonta (81) 



Opelika (82) 



Ozark (82) 



Pine Apple (82) 



Pushmataha (H) 



Rock Mills (82) 



Scottsboro (81) 



Selma (82) 



Talladega (82) 



Thomasville (81) .... 



Tuscaloosa (81) 



Union Springs (82) . . 



Uniontown (82) 



Valley Head (82) . . . . 



Altitude. 



feet. 

 741 

 685 

 700 

 738 

 590 

 573 

 200 

 285 

 91 

 563 

 621 

 826 

 220 



160 



57 

 240 

 857 

 817 

 400 



652 

 147 

 554 

 385 

 230 

 216 

 273 

 1,031 



No. of 

 years of 

 record. 



18 

 16 

 21 



8 

 16 

 27 

 25 

 25 

 18 

 25 

 23 

 14 

 27 

 10 

 17 

 25 

 16 

 38 

 37 

 15 

 30 



7 

 20 



8 

 25 

 34 

 20 

 18 

 28 

 22 

 23 

 24 



Average date of — 



Last frost 

 in spring. 



First frost 

 in autumn. 



Apr. 2 



Mar. 31 



Mar. 19 



Mar. 19 



Mar. 24 



Apr. 5 



Mar. 14 



Mar. 13 



Mar. 5 



Apr. 1 



Mar. 29 



Mar. 20 



Mar. 20 



Mar. 6 



Mar. 15 



Mar. 17 



Apr. 6 



Feb. 24 



Mar. 10 



Apr. 10 



Mar. 17 



Mar. 10 



Mar. 14 



Mar. 21 



Mar. 24 



Apr. 10 



Mar. 13 



Mar. 26 



Mar. 15 



Mar. 23 



Mar. 9 



Mar. 15 



Apr. 5 



Oct. 



Oct. 



Nov. 



Nov. 



Nov. 



Oct. 



Nov. 



Nov. 



Nov. 



Oct. 



Oct. 



Nov. 



Nov. 



Nov. 



Nov. 



Nov. 



Oct. 



Nov. 



Nov. 



Oct. 



Nov. 



Nov. 



Nov. 



Nov. 



Nov. 



Oct. 



Nov. 



Oct. 



Nov. 



Nov. 



Nov. 



Nov. 



Oct. 



20 

 27 



5 



2 



6 

 15 



9 

 12 

 20 

 30 

 29 



9 



8 

 17 

 21 



3 

 23 

 30 



8 

 15 



9 

 13 

 10 

 12 



6 

 28 



8 

 30 



8 



6 

 18 



8 

 20 



Length of 

 average 

 frostless 

 season. 



days. 



201 



210 



231 



228 



227 



193 



240 



244 



260 



212 



214 



234 



233 



256 



251 



231 



200 



279 



243 



188 



237 



248 



241 



236 



227 



201 



240 



218 



238 



228 



254 



238 



198 



"Where the frost dates have been obtained from the Summary by Sections the number of 

 the section in which any station occurs is placed in parentheses directly after the station name. 

 Where the dates have been obtained from Henry's Climatology of the United States this fact 

 is shown by H in parentheses after the station name. The letter n in parentheses after a station 

 name means that the data were obtained from a location in the immediate vicinity of the 

 station named. 



