NO. 12 TEMPERATURES AND SUN's RADIATION — ABBOT 



II 



casting for 14 days in advance. For since the effects last so long, the 

 solar conditions of a previous week as well as those of a present week 

 combine to govern the weather of the week to come. Hence it would 

 be necessary to have highly accurate solar-constant observations for 



MEAN RESULTS 19:4-1935 



SOLAR VARIATION AND TEMPERATURE DEPARTURES AT ST. LOUIS 



Fig. 5.— Oppositeness of temperature departures at St. Louis which follow 

 average rising and falling sequences of solar variation. 



nearly every day in the year in order to attempt to utilize this discovery 

 for weather predictions. Unfortunately, we cannot yet command this 

 information. Three solar-constant stations are indeed in operation, 

 but at least lo cooperating stations would be required for the purpose. 

 If means to establish and maintain lO stations were now available, 

 forecasting by this method could not begin until 1940. For the most 



