geographical and seasonal variations in solar radiation
see also: table
3D graph
2D graph at 40o
daily solar radiation / (MJ/m2)
17.7
32.5
42.2
45.7
42.4
32.8
18.8
0.3
6.5
32.0
41.6
45.0
41.8
32.3
18.0
6.6
5.6
1.0
5.5
12.9
22.0
31.5
39.7
43.0
39.9
31.8
22.3
13.0
11.7
6.2
3.1
2.1
11.6
26.7
34.0
39.4
34.4
27.0
19.0
17.8
12.3
8.7
7.5
12.1
17.6
24.1
30.8
36.5
40.5
42.0
40.7
36.8
31.1
24.4
23.5
18.4
14.9
13.5
14.8
18.2
23.1
28.7
33.9
38.3
41.1
42.1
41.3
38.6
34.3
29.1
28.4
21.0
19.8
20.9
23.9
28.2
36.3
39.1
40.8
41.4
36.7
32.9
32.7
29.3
25.7
26.6
35.3
37.5
38.9
39.5
39.2
38.0
35.7
35.9
33.8
31.9
33.5
35.5
37.0
37.7
37.6
37.2
37.1
37.4
37.9
38.1
37.3
35.8
36.1
36.9
36.6
35.2
34.1
39.6
34.6
29.9
29.2
30.0
35.0
39.0
38.5
27.8
25.1
25.2
28.0
43.5
44.2
43.3
40.9
27.4
22.8
19.7
18.5
43.8
43.6
40.1
34.8
22.6
17.4
13.9
12.6
14.0
17.5
43.2
44.8
43.1
17.2
8.2
7.0
17.3
27.7
36.0
44.4
41.9
27.3
11.3
5.9
2.9
2.0
11.4
22.9
33.3
45.9
33.0
5.3
5.4
48.1
45.1
48.8
Source: CRC Handbook of Chemistry and Physics (D.R. Lide, Editor-in-Chief), 83rd edition (2002-2003), CRC Press, Boca Raton, FL, 2002, p.14-26. [NOTE]