To work out month to month average price ranges, KAYAK takes all rates for each month over the last 12 months for round-trip flights from London to Atlanta, eliminates the top 0.1% to account for outliers, and then will take the median of all values for each and every month. https://bookcheapbusinessclass.wordpress.com/2024/10/24/what-are-the-top-tropical-destinations-to-heat-up-your-holidays/