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1. By periods
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2. Overcast within 1 day
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3. Average monthly overcast
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4. Average annual overcast
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5. Number of cloud and cloudless days in 1 month
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6. Number of cloud and cloudless days in 1 year
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7. Repeatability of cloud forms in 1 month
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8. Repeatability of cloud forms in 1 year
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9. Daily movement of clouds
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10. The height of the lower boundary of the clouds (for 1 day)
