TABLE 2 ~ Cont'd. South Dakota,Vermillion Collection Period 1957 2 Cumulative sr99 ° 6r90 Precipitation mo Sr90/mi~ mo Sr?9/ni2 (inches ) n= 9.18 7 0.19 —— January 0.08 2 0.01 9-26 # 0.19 17 0.22 February 0.38 * 0.02 9.44 2 0.19 13 2e13 April 2.5421.00 12.38 2 0.19 12 5015 May 2.28 20.06 14.66 2 0.21 12 1.85 June 0.16 U,.82 Oe2l 5 1.209 July 22 20.08 1762) 2 0.22 31 Lyols7 August 0.50 20.02 17-7) 2 0.22 ag 0019 April to =n December 1958 2 0.02 z September 0.88 October November December * Values extrapolated to midpoint of collection period. -~15-