The amount of low cloud cover impacts the planet's temperature. (notrickszone.com)
Ever been out on a cold clear night with the stars clearly visible, and then low cloud cover comes in, and you experience a warming effect? (realclimate.org)
The change in low cloud cover in the 1997 - 1998 El Niño came mainly as a decrease in optically thick stratocumulus and stratus cloud. (realclimate.org)