14 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I43 



Table 3 — continued 



Category A 

 Wolf sunspot numbers < 20 



Category B 

 Wolf sunspot numbers > 20 



The same 27 harmonic periods were evaluated for temperature fore- 

 casts that were used for precipitation forecasts (see Publ. 4390). As 

 stated above, atmospheric changes required division of the monthly 

 temperature records, 1870 through 1956, into 220 groups. Each pe- 

 riod was determined in form and amplitude by employing these groups 

 as was described in Publication 4390 and other papers cited therein. 

 Thereby a table of 216 months, 27 columns wide, was formed to cover 

 the interval 1950 through 1967. The columns were added together 

 across the table to make a single column of temperature forecasts for 

 each city for the years 1950 through 1967. This column was desig- 

 nated "2." A parallel column designated "Obs" contained the ob- 

 served temperatures of 108 months, 1950 through 1959. Both columns 



