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Table 1

Mean irradiance measured at a tilt angle of 45°, along the evaluated period. Mean and SD values were calculated from the five highest values of each month.

Month Mean irradiance/Wm−2 ± SD
May 19 132 35
June 19 43 10
July 19 77 11
Aug. 19 199 14
Sept. 19 426 23
Oct. 19 627 27
Nov. 19 835 19
Dec. 19 875 29
Jan. 20 827 57
Feb. 20 646 32
Mar. 20 537 10
Apr. 20 287 22
May 20 134 16
June 20 44 3
July 20 108 29
Aug. 20 290 41
Sep. 20 465 28
Oct. 20 701 26
Nov. 20 745 36