General observation
Time to travel
 Weather, the number of people around, costs of accommodation and entry into attractions will vary with time of travel. Check the likely weather very carefully in the areas in which you will be travelling as this can very much affect conditions such as mountain passes at surprising times. If you are travelling north-south or vice versa you will need to make sure you go to the cooler, northern part of your itinerary first if you are travelling late in the season or the reverse if you are travelling early. Keep in mind that the southern desert areas can stay very hot quite late in the year. For example Phoenix, Arizona can get into the 90's in November!
June through August are the peak Summer months and you will feel that all of America is on the road with you. The advantage is that all of the attractions will be available. After the long weekend in early September things start shutting down for winter. The advantage is that those attractions remaining open will often be cheaper. It is noticeable that after the long weekend the number of people drops off significantly but most noticeable is the disappearance of the children as this appears to be when the retirees take their holidays!
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