May    June July   August  September
 Day
 1st bird 2nd bird 1st bird 2nd bird 1st bird 2nd bird 1st bird 2nd bird 1st bird 2nd bird
1
           21.44 21.49       20.13
2
      21.32 21.32 21.16 21.16        
3
         21.48 21.49     19.59 20.01b
4
                 20.06 20.08b
5
     21.40 21.40     21.11 21.14 20.05 20.08bc
6
     21.17 21.17b       20.59 - 19.55
7
         20.48 20.48c     - -
8
     17.00 17.00  
E
   21.17d    
9
     17.08 17.20 21.40 21.40 21.00 21.01    
10
     21.50 21.50  
E
   21.17b    
11
   -                
12
   20.45 21.30 21.30   21.47 20.59 21.03b    
13
   20.47 21.58 22.00d            
14
     21.45 21.47            
15
   -           20.47b    
16
       21.32     20.46 20.51    
17
 - - 21.58 22.00   21.38d 20.37 20.44    
18
 - - 21.36 21.41     20.38 20.44    
19
 21.05 21.05       21.39 20.43 20.44b    
20
 21.06 21.07         20.33 20.40c    
21
 20.57 20.57d   21.25            
22
   21.02          
T
    
23
 21.04 21.07         20.33 20.37d    
24
 21.20 21.20b     21.30 21.30 20.24 20.32    
25
 21.23 21.27b     21.36 21.36   20.20    
26
   21.25 21.52     21.27 20.29 20.29    
27
 21.29 21.31 21.43 21.53c   21.15d 20.21 20.23c    
28
 21.25 21.32 21.57 21.45 21.24 21.29 20.21 20.27bc    
29
     21.45 22.01b 21.11 21.26dH 20.16 20.19    
30
 20.54 20.56dT   21.52b   21.31 20.10 20.21d    
31
 21.39 21.42       21.23d   20.14d    

d dark, b blue sky, c cold, T thunderstorm, E egg, H hatching out, - no entry