| Definitions | noun - (meteorology) The fraction of the sky that is obscured by clouds, in eighths (one octa means that one eighth of the sky is obscured, two octas that one quarter is obscured, and so on).
- 1935, Indian Science News Association, Science and Culture, Indian Science News Association, Page 93
- :It has been shown that most of the flood-rainy days are associatied with 6-8 octa ScFb?, CuSc? in the morning and CuSc?, ScFb? with or without Cb in the afternoon of the previous day.
- 1994, Commission of the European Communities / R. Dogniaux (Ed.), Prediction of Solar Radiation in Areas With a Specific Microclimate, Kluwer Academic Publishers , ISBN 0792325966, Page 23
- :This method does not give any information on the distribution of clouds in the sky dome. But it presents the advantage of an objective method by eliminating the source of error do to personal appreciation of the fraction of the sky covered by clouds, as is the case in the classical climatorlogical observation of the cloudiness expressed in (N = 0 corresponding to cloudless sky and N = 8, to overcast sky in this scale).
- 1998,' Ralf Koppmann and Jochen Rudolph, Atmospheric Measurements During Popcorn: Characterisation of the Photochemistry Over a Rural Area, Springer, Page 169
- :In Figure 4 we compare the photolysis frequencies of different processes in scatter plots, including all measurements from the field campaign over a variety of meteorological conditions (χ = 40-90°, 296-380 DU total ozone, 0-8 cloud cover, 9-35 °C ambient temperature).
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