Giant fish are combat encounters, not a longer wait on the same cast. The developer description points at fish weighing thousands of kilograms. It does not publish a minimum Attack stat.
Weather window
The official FAQ says weather spawns on the map every 30 minutes and despawns after 10 minutes. There is no published start clock. A snowstorm demonstration tied a boss to a variable island, not one dock. Unlock travel first, then search during the 10-minute window with a rod that can finish and a skill that is off cooldown.
The Index groups ordinary fish and giant bosses by region and is the in-game clue list. Community notes connect snowy weather with some world bosses. That is an observation, not a spawn table for every species.
How a giant fight fails
Prepare a rod you can equip, at least one damage skill, and prompt practice on ordinary fish.
- Cast at the special spot when the boss interface appears. A normal cast is not documented as the same fight.
- Answer direction and rhythm prompts while you click. Missed prompts are a documented way to lose the line.
- Spend a direct or multi-hit skill when it moves the bar, and save a finisher if the fight uses the white marker.
- If the fish heals or stuns you, return to prompts instead of retreating to the shop mid-fight.
- If you lose, write down the cause: prompts, heal, stun, not enough damage in the window, or the line snapping. Change one of those on the next try.
No public formula converts Strength into a required number for a named boss. Strength is part of the official progression sentence next to abilities. Spend it when the live menu shows a cost and an effect you can retest on a familiar fish.
Golden Catch is a separate counter for a Golden Fish, not the weather boss. One screen showed 44 catches remaining. That was the counter's current value, not a fixed rule.
Dragon Koi is named in boss discussions, but a full spawn and drop card was not in the pages read here. Use the Index entry on your island instead of a guessed timer.
The 2x Boss Drops pass was listed at 199 Robux. It does not summon the boss.