Spring  |   Apr   |   May   |   Jun   
 ------- | ------- | ------- | ------- 
    1    |    x    |         |         
    2    |         |    x    |        
    3    |    x    |    x    |        
    4    |         |    x    |         
    5    |         |         |     
    6    |    x    |         |         
    7    |         |    x    |         
    8    |         |         |        
    9    |    x    |         |        
   10    |    x    |         |         
   11    |    x    |         |         
   12    |         |         |         
   13    |         |         |         
   14    |         |         |         
   15    |    x    |         |        
   16    |    x    |         |         
   17    |         |         |         
   18    |         |         |         
   19    |         |         |        
   20    |         |         |         
   21    |         |         |         
   22    |    x    |         |        
   23    |         |         |        
   24    |         |         |         
   25    |    x    |         |         
   26    |         |         |         
   27    |         |         |     
   28    |         |         |         
   29    |    x    |         |         
   30    |         |         |        
   31    |         |         |        
 ------- | ------- | ------- | ------- 
   tot   |    11   |         |       

 Winter  |   Jan   |   Feb   |   Mar   
 ------- | ------- | ------- | ------- 
    1    |    x    |         |         
    2    |         |    x    |        
    3    |    x    |         |        
    4    |    x    |         |         
    5    |    x    |         |    x   
    6    |         |    x    |         
    7    |         |         |         
    8    |    x    |         |    x   
    9    |         |         |    x   
   10    |    x    |         |    x    
   11    |         |         |         
   12    |    x    |         |    x    
   13    |         |    x    |         
   14    |         |         |         
   15    |    x    |    x    |    x   
   16    |         |    x    |    x    
   17    |         |         |    x    
   18    |    x    |         |         
   19    |         |    x    |    x   
   20    |    x    |    x    |         
   21    |         |    x    |    x    
   22    |         |         |        
   23    |         |         |    x   
   24    |         |         |    x    
   25    |    x    |    x    |         
   26    |         |         |         
   27    |    x    |         |     
   28    |         |    x    |         
   29    |         |    x    |         
   30    |         |         |    x   
   31    |    x    |         |        
 ------- | ------- | ------- | ------- 
   tot   |    13   |    11   |    13