That's not so bad. Down here it was mid to upper 90's for almost 2 weeks and dewpoint in mid to upper 70's, even over 80 a couple days. Your weather would have been downright cool in comparison.... and we aren't even in Kansas, texas or the South where it was really, really hot.
But yes, that's a big electric bill for MI and with your rates. For that size home, it's possible to be under 800 kw-hr's.... or around $70-80 with your rates.