We got our physics expert, Gord O. to answer this one. This is what he said.

The "little drops of water" are dew drops. Dew forms on grass and things for the same reason that the bathroom mirror fogs up when someone has a shower. The humidity (water in the air) turns into a liquid when it touches something cold. In the summer, there is lots of humidity, and in the evening everything cools down. When the humidity touches the things that have cooled down, like grass and windows, it turns into little drops.

In the winter there is not much humidity so there is not usually much dew.

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