238 



ENVIRONMENTAL CONDITIONS. 



senting (as nearly as possible) the middle of the shorter period having 

 the minimum value is taken as the seventh or eighth day of the 14- 

 day period, by which method the position of this period in the calendar 

 is determined closely enough. 



The data given in the last column of table 8 are represented by the 

 chart of plate 43, on which the isotherms are shown for increments of 

 5° F., from 0° to 60°. The climatic zbnation is here seen to be generally 

 similar to that of the other temperature charts, but there are differences 

 of detail. 



Table 8. — Average normal daily temperatures for the coldest I4 days of the year. (Plate 43.) 

 [The period is frequently more than 14 days in length. Where this is true the daily normal 



is constant throughout the period given.] 



Station. 



Alabama: 



Anniston 



Birmingham . . . 

 Mobile 



Montgomery . . . 

 Arizona: 



Flagstaff 



Phoenix 



Yuma 



Arkansas: 



Fort Smith 



Little Rock .... 

 California: 



Eureka 



Fresno 



Independence. . 



Los Angeles 



Red Bluff , 



Sacramento . . . . . 



San Diego , 



San Francisco . . , 



San Jose 



San Luis Obispo 

 Colorado : 



Denver 



Durango 



Grand Junction. 



Pueblo 



Connecticut: 



Hartford 



New Haven 



Florida: 



Jacksonville 



Jupiter 



Key West 



Pensacola 



Tampa 



Georgia: 



Atlanta 



Augusta 



Macon 



Savannah 



Thomasville . . . . 

 Idaho: 



Boise 



Lewiston 



Pocatello 



Period. 



Dec. 

 Jan. 

 Jan. 

 Dec. 



Dec. 

 Dec. 

 Dec. 



Jan. 

 Jan. 



Jan. 

 Dec. 

 Dec. 

 Jan. 

 Dec. 

 Dec. 

 Dec. 

 Dec. 

 Dec. 

 Dec. 



Jan. 

 Jan. 

 Jan. 

 Jan. 



Jan. 

 Jan. 



Dec. 

 Dec. 

 Dec. 

 Dec. 

 Jan. 



Jan. 

 Dec. 

 Dec. 

 Dec. 

 Dec. 



Dec. 

 Jan. 

 Jan. 



27 to Jan. 24 



1 to Jan. 22 



2 to Jan. 15 

 30 to Jan. 14 



28 to Jan. 

 31 to Jan. 

 27 to Jan. 



14 

 13 

 16 



3 to Jan. 25 



4 to Jan. 17 



26 to 

 24 to 

 24 to 

 4 to 

 31 to 

 21 to 



29 to 



30 to 



28 to 



29 to 



Feb. 8 

 Jan. 20 

 Jan. 19 

 Feb. 5 

 Jan. 13 

 Jan. 17 

 Feb. 12 

 Jan. 16 

 Jan. 22 

 Jan. 31 



Temp, 



°F. 

 42 

 45 

 49 



47 



26 

 50 

 54 



38 

 40 



46 

 45 

 40 

 53 

 45 

 45 

 54 

 49 

 48 

 51 



Station. 



Illinois: 



Cairo 



Chicago 



La Salle 



Peoria 



Springfield 



Indiana: 



Evansville 



Indianapolis 



Iowa: 



Charles City 



Davenport 



Des Moines 



Dubuque 



Keokuk 



Sioux City 



Kansas: 



Concordia 



Dodge 



Topeka 



Wichita 



Kentucky: 



Lexington 



Louisville 



Louisiana: 



New Orleans 



Shreveport 



Maine: 



Eastport 



Portland 



Maryland : 



Baltimore 



Washington, D. C. 

 Massachusetts: 



Boston 



Nantucket , 



Michigan: 



Alpena 



Detroit 



Escanaba 



Grand Haven 



Grand Rapids 



Houghton 



Marquette 



Port Huron 



Sault Ste. Marie . . . 

 Minnesota: 



Duluth 



Period. 



Dec. 30 to Feb. 3 

 Jan. 17 to Feb. 4 

 Jan. 14 to Jan. 27 

 Jan. 3 to Feb. 2 

 Jan. 9 to Jan. 29 



Jan. 

 Jan. 



3 to Jan. 24 



4 to Jan. 28 



Temp. 



°F. 



35 



23 



21 



23 



26 



32 



28 



Jan. 10 to Feb. 1 



10 



