The American Meteorological Society recently released a report on how the weather effects baseball. Results can be seen here:
http://sports.espn.go.com/mlb/news/story?id=6476711
The upshot is that sunny days help the pitcher, cloud cover helps the batters and the fielders. The article is definitely worth the read for any baseball fan but the fantasy impact isn't great, especially for hitters. For those streaming pitchers, however, the extra .5 K/9 (approximately) caused by a sunny day just might make a difference in your choice.
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