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Add to that the more or less regular adsense/adwords system updates/maintenances, during which stats can be really late.
Add to that all the times when google-adsense servers go down in some part of the world.
Add to that all those unannounced google (beta) tests that can mess up some part of the stats (CTR etc).
Add to that the fact that many publishers dont' have millions of impressions. Without large sample it's impossible to establish a stable statistics.
And so on...
Daily stats can give you some idea what's going on during a normal day, but then again, stats may be lagging - so don't take today's earnings too seriously.