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