If you want some mining stats from past (i.e. with hashrate of X, today I get A coins, yesterday B coins, day before C coins), I am afraid that won't be so easy (not sure if there are data in the pool database for accurate calculation of such statistics), but I can look at it and see how hard that would be and how accurate results would that yield.
Just:
today, mined coins (average/h; note calculating not by 24h but by passed hours/minutes of current day)
dateA, mined coins (average/h)
dateB, mined coins (average/h)
dateC, mined coins (average/h)
no hashrate needed. The data is there - transactions -> credit, just need to be presented with per day aggregation.