For conduction to occur,
a. dark objects are required to absorb energy.
b. substances must be in contact with each other.
c. hot and cold regions must flow within a substance.
d. heat must transfer from an area of less energy to more energy.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

when cloud cover increases then the suns ray's which provides the earth with light and warmth gets covered due to the due to the suns ray's being blocked, the temperature in that region

therefore to conclude i would like to say that,

=more the cloud cover, the lesser the

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