30
02 tenths
July
20
10
0
100
810 tenths
July
90
80
70
60
800
700
600
500
1960
1950
1970
1980
1990
Figure 7. Frequency of clear skies (02 tenths) and over-
cast skies (810 tenths) in July on the North Pole drift-
ing stations indicated in Figure 5. The total July glo-
bal solar radiation on the same drifting stations comes
from Marshunova and Mishin (1994). The dashed lines
are 5-year running means.
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