As long as I've watched baseball, a tradition existed that saw only three teams in baseball play more day games than night games. Those teams were the Cubs, Giants and A's. The Cubs were obvious because Wrigley Field had no lights for decades, then when they were installed, Friday night was the only usual night game scheduling.
The A's and Giants always played more day games because their traditions included exclusively day baseball on Saturday and day baseball on mid-week getaway games, usually Wednesday. Extra day games were usually sprinkled throughout the schedule on holidays or extra weekday games for whatever reason, including Opening Day for the Giants. Day baseball on Bay Area Saturdays is not too difficult to figure out. The weather is very cool at night, and beautiful during the day. Fridays have beer and the "it's the weekend, night-out" atmosphere to keep the crowd warm.
But the last couple of years, the A's and Giants have adopted Saturday night baseball as the norm with only a few day games. The main reason is because of the exclusive rights given to Fox for the game of the week slot. Now, the Giants are Bondsless and have sucked for four years, and the A's have sucked, too. Day games on Saturday are prohibited from being televised. They now need Saturday night telecasts for revenue. When the Giants were good and everybody wanted to watch Bonds, they were on Fox every Saturday afternoon.
I've attended a few Saturday night games and it is truly strange in several ways. First, the day. Saturday has always been a Bay Area staple of baseball. You wake up and go to the ballpark, and Saturday night is left for eating out, watching a movie, what have you. Now, the crowds at Saturday night games seem odd. It's like they don't know what to do. Their routine has been interrupted and are trying to figure out whether they are supposed to be like a rowdy Friday night crowd, or like a leisurely Saturday afternoon crowd trying to substitute something - anything - for the golden sunshine. I miss Saturday day games and wish they would make a comeback somehow.