NO. 3 SOLAR VARIATION AND WEATHER — ABBOT 



37 



Fig. 30. — Forecasts of precipitation : Cincinnati, Ohio, below, Denver, Colo., above, 1950 to 1958, 



compared to observed. 



forecasts. The shifts mentioned above heighten these average differ- 

 ences above what they would otherwise be. What most recommends 

 the 10-year forecasts of precipitation is that they are about equally as 

 accurate for times of wide departure from the normal as they are 

 for times close to normal precipitation, as is shown for 14 cities in 

 P. 4471, page 6 (here fig. 33). 



10. MISCELLANEOUS MATTER RELATED TO SOLAR VARIATION 

 Ionospheric observations. — From measure of h'Fg published by 

 the Bureau of Standards, Mrs. Hill computed daily averages of 

 h'Fa from 1944 to 1957 (see P. 4338), for the hours 11, 12, 13. 

 An earlier study had fixed the average monthly value for these 



[Cont. p. 45 



