If the umpire believes the game can be played safely and well the game will continue despite the rain or snow. As soon as this is not the case, the game will be delayed. Usually if the umpire expects the delay to be significantly more than an hour, the game will be stopped.
The game is considered an official game if it is stopped after 5 or more innings of play. If the home team is winning after four and a half innings, it is also official. Whoever was winning after the last complete inning is declared the winner. If the game is tied, the game will usually be resumed at a later date from the point where it was stopped.
If the game is stopped after fewer than five innings, it is replayed from the start at a later date. Occasionally a rained-out game is not made up, if it has no bearing on the final playoff picture.
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Like most objects, when a football is wet is becomes harder to throw and hold on to. Rain will not noticably affect the flight of a football as wind does.
It can but it is gennerally not done. Last year (2009) in the World Series there were several delayed games due to rain.
If a Basketball has started and it start raining some people will leave and some will stay.
Precipitation affects the baseball field because when the runners are running they might slip and fall and it makes everything slippery and muddy.