Table 1 Sr? Denosited by 1953 and 195h Chicago Rains 1953 Chicago Rains Inches of Rain Jamuary 1.20 (0) February 1.45 (0.22) March April DPM Sr90/ft2 DPM Sr90/ft2 1,02 (0) --- 0.99 (0.15) 2.17 (0) --- 3259 (1.72) 7615 (3.h2) hob (2.49) 64.0 (35.8) 2.83 (1.59) 4.53 (1.85) 2.25 (0.80) 15.7 (6.4) May 2.0h (0.75) 7.8 (h2.3) 2143 (7,6) June 4.l9 (1.87) 37.1 (15.5) 2073 (1.55) 27.0 (15.4) July 3.95 (1.95) 22.4 (11.1) 6.37 (3.89) 18.7 (11.h) August 1.32 (0.88) 2.16 (1elh) 6.12 (0.60) 45.3 (hk3) September 2.17 (0.78) 39.0 (13.7) 0.98 (0) --- October 1.58 (0.45) 45.2. (12.9) 11,69 (6.5) 21.2 (11.8) November 1.53 (0.39) 2.0 (0.51) December 2.44 (0) Total Notess l, --- 1954 Chicago Rains Inches of Rain 640 (242) --- 1.37 (0.13) Tels (0.70) 2.05 (1.80) 2760 (23.8) 7210 “>250 Values in parentheses are totals for measured rains. 26 One April 1953 rain of 0.9 inches deposited 39.) dpm Sr90/ft2, This rain was omitted in the estimation of the contribution of April rains which were not collected. Be The estimates for August and Novenber 195) are based. on a very low fraction of the monthly precipitation with the result that the estimates are probably high for August and low for November, Such errors should approximately average out over the year.