138 



Journal of Agricultural Research 



Vol. XIII, No. 2 



Table I. — Weather conditions during igi^ and igi6 — Continued 

 PUYALLUP, WASH., 1915" 



Month. 



January 



February 



March 



April 



May 



Jime 



July 



August 



September.. . 



October 



November. . . 

 December . . . 



Yearly 



Temperature (° F.). 



Maximum. 



Mean. 



44- 7 

 49.8 

 S7-9 

 60.9 

 63.6 

 68.3 

 ?3-3 

 77-3 

 67.0 

 60. 5 

 48.0 

 47. 2 



Abso- 

 lute. 



Minimum. 



33- 2 

 37- o 

 41. 6 

 43-7 

 47-3 

 50.9 

 55-2 

 56.0 

 50.8 

 46.4 

 38.1 

 36. 7 



44' 7 



Abso- 

 lute. 



Mean 



for 



month. 



37-5 

 42. 6 

 48.7 

 51-4 

 55- o 

 59-4 

 64.8 

 65. 2 

 57- 6 

 52-4 

 42. 2 

 40. 6 



Normal 



for 

 month. 



38-1 

 40.4 

 44. 2 

 48.9 

 54-4 

 59-4 

 63-4 

 63.0 

 57-6 

 SO. 6 

 44- I 

 40.3 



Mean 



relative 



hiunid- 



ity. 



Per cent. 



85 



76.4 



Rain- 

 fall 



Inches. 

 S-87 

 3-41 

 2-34 

 3-93 

 3-42 



3-43 

 9.46 

 9. 26 



Percent- 

 age of 

 actual to 

 possible 

 sun- 

 shine. 



CHULA VISTA, CAL., 1916^ 



January . . . 

 February. . 



March 



April 



May 



Jtme 



July 



August .... 

 September. 

 October . . . 

 November. 

 December. 



Yearly . 



66. s 



" Data from the Weather Bureau Station at Tacoma, Wash, 

 fc Data from the Weather Bureau Station at San Diego, Cal. 



The most striking features brought out in Table I are the high per- 

 centage of sunshine and the consistently high temperatures, especially 

 during the months of June, July, and August, at Bard, Cal., and in con- 

 trast with this the very low figures for these two climatic features at 

 Puyallup, Wash. The mean maximum temperature for June, July, and 

 August at Bard is considerably over ioo° F. for each month. This, 

 according to the figures obtained by Sachs for com, would indicate an 

 excess of heat units during a part of the day at least. At Puyallup, 

 Wash., even the maximum temperatures do not reach the presumed opti- 

 mum for sorghums, and the actual mean temperature for the growing 

 season is about 30° below this optimum (Table II). This lack of heat 

 units no doubt is largely responsible for the indifferent growth which the 

 sorghums made at Puyallup. 



