54 



BULLETIN 1406, IT. S. DEPARTMENT OF AGRICULTURE 



winds. In Figure 28 is shown a somewhat enlarged map of this 

 territory. It should be emphasized, however, that in regions such 

 as the Pacific Northwest or the Appalachian Plateau in the Eastern 

 States it is important for the individual grower to know the temper- 

 atures prevailing in his own district in order to determine the effi- 

 ciency of common storage. Figures 27 and 28 give a basis of com- 

 parison, but it is not possible in such a map to give the detailed effects 

 of varying conditions of elevation. 



A territory having a mean prevailing temperature of about 40° F. 

 during November will probably average above 50° in October and 

 will be close to 30° for the December mean. The data presented- in 

 Figure 27 are based on the United States Weather Bureau records for 



Fig. 28. — Map of the Pacific Northwest, showing mean November temperatures 



many years and represent about the average condition to be expected. 

 It should be emphasized that particular seasons will vary consider- 

 ably from this mean, some ranging above and some below the aver- 

 ages here given. The data give an indication, however, of what the 

 apple grower in different sections of the United States can expect 

 in November temperatures, thus affording a basis of comparison 

 between the different apple -growing sections. 



TESTING COMMON-STORAGE HOUSES 



The fact that the average temperatures prevailing in common- 

 storage houses, particularly during the fall months, are often some- 

 what above the mean of the prevailing outdoor temperatures, when, 

 with good management, it is possible to obtain temperatures equal 



