| Seasons | 
        Months | 
        2010 | 
        2011 | 
       
      
        | Station I | 
        Station II | 
        Station I | 
        Station II | 
       
      
        | Post monsoon | 
        January | 
        0.971 | 
        0.972 | 
        0.978 | 
        0.979 | 
       
      
        | February | 
        0.983 | 
        0.985 | 
        0.986 | 
        0.987 | 
       
      
        | March | 
        0.978 | 
        0.975 | 
        0.976 | 
        0.973 | 
       
      
        | Summer | 
        April | 
        0.981 | 
        0.982 | 
        0.982 | 
        0.980 | 
       
      
        | May | 
        0.972 | 
        0.973 | 
        0.976 | 
        0.575 | 
       
      
        | June | 
        0.975 | 
        0.976 | 
        0.975 | 
        0.974 | 
       
      
        | Pre monsoon | 
        July | 
        0.968 | 
        0.963 | 
        0.962 | 
        0.963 | 
       
      
        | August | 
        0.985 | 
        0.987 | 
        0.987 | 
        0.989 | 
       
      
        | September | 
        0.976 | 
        0.975 | 
        0.973 | 
        0.963 | 
       
      
        | Monsoon | 
        October | 
        0.958 | 
        0.959 | 
        0.959 | 
        0.954 | 
       
      
        | November | 
        0.912 | 
        0.913 | 
        0.913 | 
        0.914 | 
       
      
        | December | 
        0.968 | 
        0.963 | 
        0.963 | 
        0.968 | 
       
      |