Abstract
Various aspects of the connection between low cloud cover (LCC) and cosmic rays (CRs) are considered. Most features of this connection point to the absence of substantial causal relationship between LCC and CRs. Even on the assumption that some LCC fraction is related to CR intensity and varies with it, its most likely value is about 2% (although, within two standard deviations it can be as high as 20%). The most serious argument against the causal relationship between CRs and LCC is the existence of negative correlation between low and medium cloud cover (MCC). The scenario of simultaneous influence of solar activity on CRs and cloud cover is discussed, which might lead to the observed correlations.
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