Rainfall Summary for Chennai City

  Dry months Summer South West monsoon North East monsoon   Monsoon
Year

Jan

 Feb Jan-Feb

Mar

 Apr May Mar-May Jun Jul Aug Sep Jun-Sep Oct Nov Dec Oct-Dec Total  
Mean 16 4 20 3 14 49 66 54 98 150 109 411 283 350 138 771 1268 start date
Actual Mean 19 29 48 22 20 43 77 57 125 101 153 434 422 308 123 903 1420 end date
Ave. Rain days 2 0.7 2.7 0.4 0.9 1 2.3 4 7 8 7 26 11 11 5 27 58  
                                     
2008 50.2 10.0 60.2 165 0 1.6 166.6 125.2 29.4 147.0 121.0 422.6         649.4  
Departure % 214% 150% 201% 5400% -100% -97% 152% 132% -70% -2% 11% 3%         -49%  
RD 2 2 4 9 0 0 9 8 5 8 3 24         37  
                                     
2007 0 6.6 6.6 0 0.4 0.2 0.6 94 249.2 166.2 167.6 677 275.4 95 255.2 625.6 1309.8 Oct 22nd
Departure % -100% 65% -67% -100% -97% -100% -99% 74% 154% 11% 54% 165% -3% -73% 85% -19% 3% Jan 10th
RD 0 1 1 0 0 0 0 10 12 12 8 44 11 5 9 25 70  
                                     
2006 3 0 3 9.5 7.1 17.8 34.4 36.4 73.8 139 143.8 393 635.6 236.2 20.8 892.6 1323 Oct 19th
Departure % -81% -100% -85% 217% -49% -64% -48% -33% -25% -7% 32% -4% 125% -33% -85% 16% 4% Dec 28th
RD 1 0 1 1 1 2 4 7 8 11 10 36 15 19 3 37 78  
                                     
2005 2 5 7 0 83 31 114 31 152 56 98 337 1078 608 422 2108 2566 Oct 12th
Departure % -88% 25% -65% -100% 493% -37% 73% -43% 55% -63% -10% -18% 281% 74% 206% 173% 102% Dec 19th
RD 1 1 2 0 3 1 4 4 7 5 6 22 14 15 12 40 68  
                                     
2004 51 0 51 0 3 211 214 29 42 48 241 360 285 280 7 572 1197 Oct 18th
Departure % 219% -100% 155% -100% -79% 330% 224% -46% -57% -68%

121%

 -12% 1% -20% -95% -26% -6% Nov 12th
                                     
2003 0 0 0 6.2 0 0.5 6.7 31 94 126 169 420 149 85 77 311 737.7 Oct 20th
Departure % -100% -100% -100% 107% -100 -99% -92% -43% -4% -16% 55% 2% -47% -76% -44% -60% -42% Dec 25th