Question

Why does dew form only on cold winter mornings??

Answer 1

dew is deposit of waterdrops formed at night by the condensation of water vapour from the air onto the surfaces of objects freely exposed to the sky . It forms on clear nights when the air is calm or, preferably, when the wind is light.
 
This happens at different temperatures depending on how wet the air is ie the amount of water vapor in the air, the humidity. 

so it
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Answer 2

Dew is water in the form of droplets that appears on thin, exposed objects in the morning or evening due to condensation. As the exposed surface cools by radiating its heat, atmospheric moisture condenses at a rate greater than that at which it can evaporate, resulting in the formation of water droplets. Water vapor will condense into droplets depending on the temperature. The temperature at which droplets form is called the dew point. When surface temperature drops, eventually reaching the dew point, atmospheric water vapor condenses to form small droplets on the surface.