WINTER INJURY 



295 



Table 33. — Tree Temperatures on Cloudy Days 



(After Mia- 135) 



Date 



Hour 



Southwest Northeast 



side, 



degrees 



Centigrade 



side, 



degrees 



Centigrade 



Air, degrees 

 Centigrade 



Jan. 15 

 Jan. 16 

 Jan. 17 

 Jan. 19 

 Jan. 20 

 Jan. 21 

 Jan. 23 

 Jan. 24 



•6.9 

 3.3 

 1.9 



■3.9 

 0.0 

 0.0 



-2.2 



-0.5 



-7.5 



2.8 

 -3.0 

 -3.9 

 0.0 

 0.0 

 -2.2 

 -0.5 



-5.5 

 2.6 



-3.9 



-2.5 

 1.1 



-2:2 

 0.0 

 4.4 



Table 34. — Tree Temperatures on Sunny Days 



(Data from same tree as Table 33) 



(After Mix^^") 



sudden falling of temperature after the sun's heat is withdrawn at 

 sunset. Even more striking temperature differences may occur occasion- 

 ally. In fact Mix records a temperature of 92°F. on the southwest side 

 on Feb. 20, while the temperature on the northeast side was 35°F. 



