Pack or skip
Packable down jacket for Jacksonville in December
Verdict
Pack it
Lows around 45°F — the packable puffer covers 90% of layering needs.
Why
Jacksonville in December averages highs of 66°F, lows of 45°F, 8 rainy days.
That climate means a packable down jacket earns its space in the bag. Lows around 45°F — the packable puffer covers 90% of layering needs.