Where did spring go?

Just last week we were having overnight low's that prompted the furnace to kick on.  This week we are having high's in the upper 80's!  What the heck happened to spring?  I really thought these temps were just an anomaly since it is still early May, but when I just checked the five day forecast it shows nothing but upper 80's...not what I am hoping for!  It's also pretty miserable with allergies this time of year, so I guess the one good thing is that I won't mind too much if we have to break down and turn on the a/c...although there is usually much more of a break between the furnace and a/c!