SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



tation persists in the averages for many months, on which clay from 

 2 to 8 times as much precipitation falls as on neighboring days of 

 minimum precipitation usually I day earlier and 2 days later. At 

 intervals ranging from 40 to 100 weeks the day of maximum precipi- 

 tation shifts a little, within the period, and at times, though rarely, a 

 pronounced double maximum persists. 



Table 4 — Percentages of Precipitation 



Interval I II III IV 



on Selected Days 



1924-Oct. 1924 

 1924-Sept. 1925 

 1925-Nov. 1927 

 1927-Oct. 1928 

 1928-Dec. 1929 

 1930-Mar. 1931 

 1931-Dec. 1931 

 1932-Nov. 1932 

 1932-Nov. 1933 

 1933-Mar. 1935 

 1935-Dec. 1935 

 1936-Dec. 1936 

 1937-June 1937 

 juiy 1937-Dec. 1937 

 Jan. 1938-May 1939 



Jan. 



Nov. 



Oct. 



Dec. 



Nov. 



Jan. 



Apr. 



Jan. 



Dec. 



Dec. 



Apr. 



Jan. 



Jan. 



July 



11.4 

 18.4 

 134 



5-8 

 14.4 

 11.0 

 19.8 

 23.3 

 12.4 

 16.6 

 10.6 

 14.2 



6-3 

 16.5 

 12.4 



17.4 



4.2 



24.3 



13-5 

 28.5 

 13.0 

 10.8 



17-5 

 13-8 

 14-5 

 5-7 

 20.8 



9-5 



5-2 



16.3 



7-9 

 31.1 

 10.7 



13-5 

 22.5 

 26.8 

 8.1 

 u. 6 

 11. o 

 26.0 



i5-i 



17.9 



6.7 



20.2 



8.6 



28.0 

 17.8 

 n. 7 

 21.0 

 12. 1 

 9.4 

 6.6 

 20.4 

 10.4 

 12.7 

 30.8 

 12.7 

 15-5 

 15-5 

 20.3 



21. 1 

 6.7 



99 



10.2 

 12.4 



6.1 

 19.6 

 11.7 

 10.4 



7.2 



17-5 

 24.1 

 22.2 



17-3 

 12.2 



VI 



8.1 

 12.3 



13-9 

 23.5 



6.9 

 23-4 

 10.9 



5-7 

 17.8 



9-7 



9-3 



74 



25.7 



12.0 



16.9 



vn 

 6.1 



9-5 

 16.0 

 12.6 



3-2 

 10.3 

 24.2 



9-7 

 24.2 



134 

 11.0 

 2.9 

 14.2 

 13-3 

 13-3 



Total 



IOO 



IOO 

 IOO 

 IOO 

 IOO 

 IOO 

 IOO 

 IOO 

 IOO 

 IOO 

 IOO 

 IOO 

 IOO 

 IOO 

 IOO 



Max . 

 Min. 



4.6 



74 

 2-5 

 4.0 



8.9 

 44 

 3-7 

 4.1 



2.3 

 3-6 

 54 

 8-3 

 4.1 



3-9 

 24 



In May 1939, an exceptionally dry month, maxima of precipitation 

 occurred on Saturday and Monday. According to table 4 maximum 

 precipitation should have occurred between them on Sunday. In 

 reality zero precipitation occurred on Sunday, Wednesday, Thursday, 

 and Friday. If we use the average position of maxima and minima 

 in the interval from January 1938 to the present time, the maxima 

 for June 1939 should fall on Sunday and Tuesday, the minimum on 

 Saturday, and these features should come 1 day earlier in the week 

 successively in subsequent months. 



