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Buenos Aires looks quite similar to Nice; except that it seems there is constant a 2 week delay - i.e. BA's fall temps look like those of Nice 2 weeks earlier at the same period (March in BA = mid-Aug to mid-Sep in Nice instead of Sep; April in BA = mid-Sep to mid-Oct instead of Oct, etc )
That is the transitional quarter from summer to winter, so I'd say Sep-Oct-Nov is the best fit hemisphere-wide. Some places, such as many parts of California, locally define it more as Oct-Nov-Dec, because of the seasonal lag in summer. On the other side, in Alaska autumn is more of an Aug-Sep affair. In many other places such as the Koeppen Cfa zone autumnal weather can drag on into winter.
Buenos Aires looks quite similar to Nice; except that it seems there is constant a 2 week delay - i.e. BA's fall temps look like those of Nice 2 weeks earlier at the same period (March in BA = mid-Aug to mid-Sep in Nice instead of Sep; April in BA = mid-Sep to mid-Oct instead of Oct, etc )
Nice has an A autumn for me
BA has an unusual sunshine pattern during autumn, only 15 hours difference between the 3 months- if the figures are correct.
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