There are four climatic types of islands in the Grand Line: Winter Islands, Summer Islands, Spring Islands, and Autumn Islands. Each of these islands have a climate similar to their namesake seasons. There are still different seasons on each island, with the weather in each season dependent on the type of island. The Red Line is composed of such islands grouped together.
Island Climatic Zones
The climatic type of an island is reflected upon the sea which surrounds the island itself. So, when sailing through the Grand Line the weather becomes stable, then there is most likely an island in proximity. Between the islands, the weather is inconsistent and unpredictable. A particular case of this phenomenon is the immediate first part of the Grand Line, after Twin Cape, because the influences of the first seven island climatic zones and their magnetic field make the weather chaotic.
A Winter Island (冬島 Fuyu-jima?) is an island with cold climate. On winter islands, snow is normally seen even in the summer.
A Spring Island (春島 Haru-jima?) is blooming with plant life and has nice warm weather.
- Green Bit
- Unnamed island where the On Air Pirates were last seen (in the New World).
A Summer Island (夏島 Natsu-jima?) has a hot and dry climate.
- The Red Line, according to Nami, is composed of several islands linked together, each with its own climatic zone.
- Rusukaina is a forty-eight season island whose climate changes every week.
- Little Garden is a prehistoric island which has an extreme climate and where dinosaurs are not extinct.
- Raijin Island is an island where lightning falls the same way rain does.
- Enies Lobby is an island where it is always daytime.
- Wano Country is divided into different regions, each with its own unique climate.
- Punk Hazard is split into two zones with two different climates.
- One Piece Manga and Anime — Vol. 15 Chapter 132 and Episode 79, Vivi explains the four standard climatic types of islands in the Grand Line and their influences over the weather.
- SBS One Piece Manga — Vol. 38, Oda explains that there are still for seasons on each type of island when someone asks what the Straw Hats' favorite seasons and islands are.
- One Piece Manga and Anime — Vol. 62 Chapter 604 (p. 14) and Episode 524, Nami explains the islands that form the Red Line.
- One Piece Manga and Anime — Vol. 13 Chapter 115 and Episode 70, Vivi explain that the weather of the first part of the Grand Line is a special case.
- One Piece Manga and Anime — Vol. 61 Chapter 595 (p. 4) and Episode 514, Unnamed climatic islands that the Drake Pirates were on
- One Piece Manga and Anime — Vol. 61 Chapter 595 (p. 4) and Episode 513, Unnamed climatic islands that the On Air Pirates were on
- One Piece Manga and Anime — Vol. 24 Chapter 218 and Episode 144, Nico Robin states that according to the record, the island after Arabasta is an Autumn Island.
- One Piece Manga and Anime — Vol. 61 Chapter 597 (p. 9) and Episode 516, Rusukaina shown to be have forty-eight seasons.