Now that I think about it, statistically my dreams outside take place during either sunny or cloudy days, while dreams inside take place during the night.

I had a lucid once though where I just walked down the street and marveled as the dream cycled from a dark winter night with heavy snowfall and hundreds of snowflakes dancing before my eyes, and where I could see the bright orange projection of a streetlight reflecting off of banks of snow glowing a sort of purplish blue, to bright and sunny day, to a cloudy one, and finally to one of those autumnal sunsets that tends to color everything a pretty shade of orange. It was the most beautiful dream I ever had.