78 THE INSECT ASSOCIATION OF A LOCAL ENVIRONMENTAL COMPLEX! 
Table XII. 
Year 1913. 
Year 1914. 
Physical Factor. 
January, j 
February. 
March. 
April. 
May. 
June. 
July. 
August. 
September. 
October. 
November. 
December. 
January. 
February. 
March. 
Average barometric pressure 
29'51 
29-788 
29-52 
29-58 
29-8 
29-91 
29-89 
29-89 
29-77 
29-66 
29-55 
29-74 
29-90 
29-40 
29-17 
Average maximum air tem- 
perature, F. 
42-6 
47-5 
49-6 
56-0 
60-5 
64-76 
65-6 
68-1 
65-7 
62-3 
59-3 
58-0 
60-0 
56-2 
59-4 
Average minimum air tem- 
perature, F. 
34T 
34-5 
39-6 
44-8 
50-9 
1-7 
50-9 
53-4 
49-8 
53-3 
41-9 
42-0 
35-5 
34-6 
39-7 
Average minimum tempera- 
ture on grass, F. 
31-3 
32-5 
35-6 
39-8 
43-1 
47T 
46-1 
46-5 
44-4 
44-2 
36-6 
37-3 
37-9 
42-2 
43-0 
Average soil temperature, 
F. , 6 inches deep 
38-9 
38-9 
39-3 
45-4 
49-8 
56-0 
58-3 
59-1 
56-7 
50-9 
42-9 
42-3 
44-5 
41-0 
40-2 
Average soil temperature, 
F. , 18 inches deep 
40-5 
40-5 
40-7 
45-4 
50-3 
56-5 
58-3 
60-0 
58 . 
52-9 
45-7 
43-6 
38-6 
42-4 
41-7 
Total rainfall in inches 
2-16 
1-01 
3-17 
3-11 
3-59 
2-77 
1-13 
2-83 
1-85 
7-2 
5-00 
3-88 
2-91 
4-75 
6-84 
