If you hate the cold of winter, cloudy skies at night are a great thing. Cloud cover at night acts much like a blanket. It keeps any warmth at the ground from escaping up into the atmosphere, which makes for relatively warmer lows at night. On the flip side, cloudy skies during the day blocks out the sun. Less sun means relatively cooler highs for the afternoon.
So before you complain about how gloomy things look on a cloudy day, remember... even those clouds can be your friend. -BA