Entry from British & World English dictionary
noun (plural same or oktas)Meteorology
A unit used in expressing the extent of cloud cover, equal to one eighth of the sky.
- The amount of sky covered is typically measured in oktas, eighths of sky cover, a non-linear scale.
- Overcast skies (typically 7-8 okta of stratus) reduced exposures by a mean of 54%.
- It was 0.2 + / 0.06 (54% of clear sky conditions) for activities in which cloud cover was measured at 7 okta or greater.
1950s: alteration of octa-.
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