days  date        temp_avg  sal_avg  
0     2012-06-11  25.9      33       
1     2012-06-12  25.6      28.6     
2     2012-06-13  26        24.8     
3     2012-06-14  27        27.9     
4     2012-06-15  26.3      30.8     
5     2012-06-16  26        31.7     
6     2012-06-17  26        32.4     
8     2012-06-19  27.5      33.4     
9     2012-06-20  28.4      33.4     
10    2012-06-21  29        33.8     
11    2012-06-22  28.7      33.9     
12    2012-06-23  29        33.9     
13    2012-06-24  29.6      34       
14    2012-06-25  28.5      33.1     
15    2012-06-26  25.8      32.4     
16    2012-06-27  24.3      32.8     
17    2012-06-28  25.9      32.8     
18    2012-06-29  27.6      33       
19    2012-06-30  29.4      33.1     
20    2012-07-01  29.6      33.8     
21    2012-07-02  29        33.5     
22    2012-07-03  29.7      33.7     
23    2012-07-04  30.3      33.4     
24    2012-07-05  30.6      32.9     
25    2012-07-06  30.6      32.6     
26    2012-07-07  30.9      33.2     
27    2012-07-08  31        35       
28    2012-07-09  30.8      36       
29    2012-07-10  29.3      36.2     
30    2012-07-11  28.3      35.5     
31    2012-07-12  28.7      35.5     
32    2012-07-13  29.5      35.7     
33    2012-07-14  30.1      35.9     
34    2012-07-15  30.7      36       
35    2012-07-16  30.8      36.2     
36    2012-07-17  30.4      36.3     
37    2012-07-18  29.9      35.7     
38    2012-07-19  29.9      35.6     
39    2012-07-20  29.4      35.9     
40    2012-07-21  28.9      36.3     
41    2012-07-22  29.6      36.2     
42    2012-07-23  30.4      36.3     
43    2012-07-24  30.5      36.7     
44    2012-07-25  29.4      35       
45    2012-07-26  30.2      35.7     
46    2012-07-27  30.7      36.1     
47    2012-07-28  30        36.6     
48    2012-07-29  28.8      36.6     
49    2012-07-30  26.9      30.7     
50    2012-07-31  27.9      31.3     
51    2012-08-01  28.5      32.8     
52    2012-08-02  29.4      33.1     
53    2012-08-03  29.7      34       
54    2012-08-04  30.3      34.7     
55    2012-08-05  30.4      35.2     
56    2012-08-06  30.7      35.3     
57    2012-08-07  29.7      35       
58    2012-08-08  28.6      34.4     
59    2012-08-09  29.2      34.4     
60    2012-08-10  29.1      33.8     
61    2012-08-11  28.6      34       
62    2012-08-12  28.7      34       
63    2012-08-13  29.2      34.4     
64    2012-08-14  29.6      34.8     
65    2012-08-15  29.9      35.1     
66    2012-08-16  30        35.3     
67    2012-08-17  29.6      35       
68    2012-08-18  28.7      34.4     
69    2012-08-19  28        33.3     
70    2012-08-20  27.8      33.7