We are planning a trip to USA next year, and are trying to decide when is the best time to come. We would like to see New York but only for a few days, and possibly Boston, but mainly New England, and take in some of the fantastic fall colours. We could come from the last 2 weeks in september going into October , we would take approx 3 weeks in total. We don't know whether to take majority of time in September, or October or split the time equally between the two months. What would the weather be like in these months?Any help would be gratefully received. Thanks.