12 Table 2 DPM Sr90/Ft? Deposited by 1955 Rains and Snows Month Chicago January February Pittsburgh Washington, D.C. 6.6 (1,20) ~18 8%(1,61") 30.0 (1.7h") March Uhe9 (2.17") 25.2 (3.0") 58.5 (3.49") April 88.6 (4.8)") 75.3 (2.33") May 3947 (2.42") 105.0 (2.66") 120.2 (1.82") June ~67.8#(2.77") 80.3 (2.82") July 31.6 (2.63") 78.6 (2.35") August 13.0 (6.60") 133.0 (6.95") September 10,8 -(1,57") 8.3 (1,84") October 27.5 (6.12") 31.7 (3.27") November 18.2 (1.77") 15.6 (2.79") December 5.5 (0.47") 709 if tt * Based on assay of two thirds of total monthly rainfall,