Yes — considerably.
The windy season is getting established. Conditions are already very good, but there can be more variation than during the peak months. For many riders, having a slightly larger kite available is useful.
These are among the strongest months in Preá. Wind frequently reaches
30 knots or more, making smaller kites particularly important. If you're a light rider, this is when a 5 or 6 m can become genuinely useful rather than just emergency luggage.
The wind remains highly reliable, and
7–9 m sizes are particularly common around Preá for an average-weight rider.
December can still be excellent, but the average wind begins to soften compared with the strongest part of the season. A larger kite becomes more useful again, particularly for heavier riders.
This is important if you're coming specifically for a
December Brazil kite trip: don't pack exactly the same quiver you would choose for September.