I've enjoyed reading through this thread!
I think a lot of it has to do with what size your house is, as several people have mentioned. And how many users there are.
OP, I really think you don't need to worry at all!
My husband and I have a 1100 sqft condo, and in the summer our bill was about the same as yours because of air conditioner, we were having 114 degree days.
But here in the fall the weather outside has been nice and about 75 degrees, so we haven't had the air or heat on at all hardly and this month our bill was $57.
I'm not sure how we achieved that lol but hubby was a happy camper. I assume a lot of it has to do with the weather outside. Plus, my husband and I don't have kids so when we are at work nothing gets used.
I wouldn't worry OP, you probably have a bigger home and kids, your bill seems normal! My mom lives in a 2,000 sqft home with my grandparents and her bill has gone up a bit because of the number of users, even though they are all conservative. More so than my husband and I.
Good luck this month, I wouldn't worry about it though!