Seasons

Seasons (Japanese:  season) are a mechanic from the fifth generation of the Pokémon games.

Seasons will not change in-game automatically; they will change only upon exiting a cave or building. Unlike in the real world, where each season lasts for approximately three sequential months (in the astronomical model) or exactly three sequential months (in the meteorological model), the seasons in Unova will change each month, going through the full cycle of spring, summer, autumn, and winter three times per year.

Spring
Spring (Japanese:  spring) occurs in January, May, and September.

Effects

 * Morning begins at 5:00 AM, while Day lasts until 7:59 PM.
 * and appear in their Spring Form.
 * Snow is not present in any locations.
 * Certain areas may have.
 * Some wild Pokémon encounter rates change.
 * The background music on most routes changes slightly.
 * Casteliacones are sold on Tuesdays.
 * Cynthia is in Undella Town and will battle the player daily; female Elite Four members may visit her.
 * Maya (if the player is ) or Dirk (if the player is ) is at the  in Nimbasa City.
 * Persephone (if the player is ) or Dirk (if the player is ) is at the  in Nimbasa City.
 * N will battle with his spring team at N's Castle.

Summer
Summer (Japanese:  summer) occurs in February, June, and October.

Effects

 * Morning begins one hour earlier, at 4:00 AM, while Day lasts an hour longer, until 8:59 PM.
 * and appear in their Summer Form.
 * Snow is not present in any locations.
 * Some wild Pokémon encounter rates change.
 * The background music on most routes changes slightly.
 * Casteliacones are sold on Tuesdays.
 * Cynthia is in Undella Town; female Gym Leaders may visit her.
 * Andy (if the player is ) or Austin (if the player is ) is at the  in Nimbasa City.
 * June (if the player is ) or Augustin (if the player is ) is at the  in Nimbasa City.
 * Tame appear in Striaton City at night.
 * There will be additional NPCs in Undella Town, one of whom will trade his for a.
 * N will battle with his summer team at N's Castle.

Autumn
Autumn (Japanese:  autumn), also known as fall in North America, occurs in March, July, and November.

Effects

 * Morning begins at 6:00 AM, while Day lasts until 7:59 PM.
 * and appear in their Autumn Form.
 * Snow is not present in any locations.
 * Some wild Pokémon encounter rates change.
 * The background music on most routes changes slightly.
 * Casteliacones are sold on Tuesdays.
 * Cynthia is not in Undella Town (unless she hasn't been fought yet).
 * Trisha (if the player is ) or Aurora (if the player is ) is at the  in Nimbasa City.
 * Trisha (if the player is ) or Andy (if the player is ) is at the  in Nimbasa City.
 * Fallen leaves are present on.
 * Due to leaves piling up, certain areas can be accessed that are normally inaccessible.
 * The water in the Castelia Sewers is drained.
 * N will battle with his autumn team at N's Castle.

Winter
Winter (Japanese:  winter) occurs in April, August, and December.

Effects

 * Morning begins at 7:00 AM, while Day lasts an hour shorter, until 6:59 PM.
 * and appear in their Winter Form.
 * Snow is present in Twist Mountain, Icirrus City,, Moor of Icirrus, and Dragonspiral Tower; all puddles in these locations are frozen over, acting as ice tiles. Small patches of snow are also present in other locations, such as Driftveil City.
 * Due to snow piling up, certain areas can be accessed that are normally inaccessible, while certain cave entrances in Twist Mountain are covered by it.
 * and are common in Driftveil City, Cold Storage,, and Mistralton City.  are common in Icirrus City and.
 * Some wild Pokémon encounter rates change.
 * The background music on most routes changes slightly.
 * Casteliacones are not sold.
 * Cynthia is not in Undella Town (unless she hasn't been fought yet).
 * Winter (if the player is ) or Martin (if the player is ) is at the  in Nimbasa City.
 * December (if the player is ) or January (if the player is ) is at the  in Nimbasa City.
 * The water in the Castelia Sewers is drained.
 * N will battle with his winter team at N's Castle.

Trivia

 * Because February is included among the months considered as summer in the games, summer is the shortest season on average. Whereas the other seasons each last a total of 92 days in a real-time year, summer lasts a total of 89 days, or 90 days in case of a . In the real world, this is true for astronomical summer in the southern hemisphere, as the Earth is near ; astronomical summer lasts only approximately 89 days, while winter lasts closer to 94. The opposite is in effect for the.
 * When summer and winter start in the Northern Hemisphere of the real world, the same season is in effect in-game. This is not true for spring and autumn: it is spring in-game when autumn starts in real life and vice versa. The opposite is true for the : real-world spring and autumn start in months with their respective in-game seasons, while summer and winter start in in-game winter and summer respectively.
 * In the astronomical model of seasons (used in and parts of ), seasons start at s and es. In the game, seasons start at the start of the month, as is the case in the meteorological model of seasons (used by  and in countries such as ).
 * , the first games to introduce this feature, were released during autumn in Japan, and the in-game season was spring. The international releases were released during spring in the Northern Hemisphere, and the in-game season was autumn.

In other languages
Jahreszeiten Estaciones del año Saison Stagioni きせつ 季节