TABLES OF DIFFERENCES OF MEAN TEMPERATURES. 159 



Extremes of daily fluctuation in December and June. 





Arctic Stations (4). 



Temperate 



Stations (5). 



Gulf Stat 



ons (3). 



Dec. 



June. 



Dec. 



June. 



Dec. 



June. 





























Md'nt 



—0.2 



—3-2 



—1-5 



—4-9 



—1-3 



— 2.0 



I 



— 0.2 



—3 



9 



— 2.2 



—6 







—1.4 



—2-3 



2 



— °-3 



—4 



2 



—2.5 



—6 



7 



—1.6 



—2-5 



3 



— 0-3 



—3 



5 



—2.7 



—7 



3 



—1.8 



—2.8 



4 





— 2 



6 



—2-9 



—7 



6 



— 2.0 



— 3-0 



5 



— 0.4 



— I 



6 



— 3-0 



—7 



5 



—2.4 



—3-4 



6 



—0.4 



. — 



7 



—2-9 



— S 



9 



—2-S 



—2.7 



7 



—0.4 



+° 



3 



—2.9 



—3 



6 



—2.7 



— 1.2 



8 



— 0.2 



+ 1 



4 



— 2-S 



- — I 



I 



—1.8 



-(-0.2 



9 



0.0 



+ 1 



8 



—1.4 



+ 1 







—0.6 



+1-3 



lO 



+0.1 



+2 



4 



+0.3 



+2 



9 



+ 1.1 



+ 1.9 



II 



+°-3 



+2 



8 



+1.9 



+4 



6 



+2.0 



-j-2.6 



Noon 



+°-S 



+3 



2 



+3-3 



+6 



I 



+2.4 



+ 2.7 



I 



+0.4 



+3 



3 



+4.1 



+ 7 







+2.7 



+3-° 



2 



+0.3 



+3 



3 



+4.6 



+ 7 



6 



-1-2.8 



+3-1 



3 



-(-0.2 



+ 2 



9 



+4-5 



+ 7 



7 



-1-2. 9 



+3-5 



4 



+0.1 



+2 



4 



+3-7 



+ 7 



S 



+ 2.8 



+3-7 



5 



+0.2 



+ 1 



7 



+2.4 



+6 



6 



+2.0 



+ 2.7 



6 



-j-0.2 



+ 1 







+ 1-5 



+5 



2 



+I.I 



+ 1.1 



7 



+0.2 



+0 



2 



+0-5 



+ 2 



8 



+0.4 



—0.4 



8 



-|-0.2 



■ — 



5 



+0.1 



+° 



2 



0.0 



— I.I 



9 



+0.1 



— I 



3 



— 0.4 



— I 



7 



— °-3 



—1.4 



lO 



+0.1 



. — 2 







—0.8 



■ — 2 



9 



— 0.6 



—1.8 



II 



O.I 



—2.6 



— 1.2 



—4.0 



— I.I 



—1.9 



The above numbers are plotted on diagrams E, F, and G. These diagrams show 

 plainly, in December the morning minimum later and the afternoon maximum earlier 

 than in June ; also the morning and afternoon epochs of mean daily temperature 

 later in December (nearly two hours) than in June, but in the temperate latitudes 

 the afternoon hour (8 o'clock) answers for the time of the winter as well as for 

 the time of the summer solstice. 



