function [MM] = extract03 (M)

s = size (M);
n = s (1);

MM = [];

for i = 1 : n
    
    year = M (i,1);
    month = M (i,2);
    day = M (i,3);
    hour = M (i,4);
    
    rain = M (i,5);
    
    if hour == 03
        
        MM = [MM;year,month,day,hour,rain];
        
    end
    
end