I also think that the lack of true summer heat until the past week made the arrival of summer weather feel worse. Many of us had gotten accustomed to moderate temps, but more importantly the low dews during June, that once it warmed up AND got quite muggy last week...that was a jolt to a lot of people.
If it's in the 20s and 30s for days on end, no big deal. If we get one of those Januarys where it's in the 40s and then we get a run of 32 degree days, suddenly it feels much colder than it otherwise would.