I agree with the weather sites mentioned above.
Often, instead of re-inventing the wheel, I search online to see what others have done in the past.
For some ideas from routes others have planned, try searching for:
Quote:
70 degree road trip
75 degree road trip
80-degree road trip
60 degree road trip
chasing 75 degrees
rving following 70 degree weather
rv trip in 70-degree temps
70 degree road trip
rv travel based on weather
where is the average temperature 75 degrees year round
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Or, whatever variation you want. The above were some suggested searches by google.
Some folks have written about their past travels. Some include maps.
IIRC, there was a mapping tool that would help plan a route with a given temperature. I do not remember what it was. It may not even exist anymore. Or, someone might mention it in one of the articles you might find online.