I'm probably heading out to NYC/Boston for holiday in a couple of weeks . I'm not sure what the weather is going to be like - browsing the interwebs seems to gather temps between 26-39*C (79-102*F) at this time, which seems like a pretty wide range. If any of you guys living out there (or been before) could give me a few pointers, that would be great - is it so warm that air con is a must 24/7, will I 'survive' with t-shirt/jeans, etc? Also, anywhere cool to see? (going to head up to the main tourist places without doubt).