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The weather mechanic in New Horizons works slightly different from the other games. For one thing, the game uses weather seeds that predetermine a specific island's weather. Also, the different weather and wind patterns
==Weather seeds==
In New Horizons, there are weather seeds that predetermine the weather for an island. There are <span title="Exact number: 2,147,483,648">over 2 billion</span> weather seeds in the game's files. When a new [[Deserted island|island]] is created, the game will randomly select 1 of these seeds. Then the chosen weather seed will list the weather patterns, one for each day, as well as when special clouds occur. It also lists when shooting stars occur during a [
==Weather patterns==
There are 34 weather patterns in New Horizons. All of these patterns are divided into specific groups, based on the first part of their label. For example, Fine02 will be in the Fine group, while CloudRain00 belongs to the CloudRain group. There are 10 groups, with 8 being normal groups and 2 being the special groups. The weather patterns in the normal groups are stated in the weather seed with one pattern for each day, and they occur on normal days with no events. The 8 normal groups are stated in the following:
*'''Fine''' patterns are sunny all day. There are 7 Fine patterns ranging from Fine00 to Fine06. The Fine00, Fine02, Fine04, and Fine06 patterns are meteor shower patterns, meaning that those patterns will have a guaranteed meteor shower with shooting stars. Fine00 will produce a heavy meteor shower while the other 3 patterns will produce a light meteor shower. Heavy showers have 5 or 8 stars a minute, very frequently (every other minute on average), between 7 PM and 4 AM. Light showers have 5 stars a minute, in very rare bursts. During [[Winter]], Fine01, Fine03, and Fine05 will produce an [[Aurora (weather)|aurora]] during clear hours in the night.
*'''Cloud''' patterns are cloudy all day. There are 3 Cloud patterns (Cloud00 to Cloud02). The only Cloud pattern that can produce rain is Cloud02 from 8 AM to 11 AM and again from 2 PM to 5PM. Other than that however, there will be cloudy skies.
*'''Rain''' patterns will rain over the course of the day, with a few 1-4 hour breaks. There are 6 Rain patterns (Rain00 to Rain05). There is only one 1 pattern in which it will rain all day without any breaks: Rain04. All of the Rain patterns except for Rain00 will produce at least 1 hour of heavy rain with thunderstorms being possible.
*'''CloudRain''' patterns will be cloudy in the morning and rainy the rest of the day. There are 3 CloudRain patterns (CloudRain00 to CloudRain02). The only times there will always be no rain is from 6 AM to 10 AM. Like the Rain and FineRain patterns, there can be heavy rain and thunderstorms.
*'''RainCloud''' patterns will be rainy in the morning until 3 PM, then will be cloudy the rest of the day. There are 3 RainCloud patterns (RainCloud00 to RainCloud02). RainCloud02 will have heavy rain and possible thunderstorms from 6 AM until 8 AM.
There are 2 special weather groups, with both of them only having 1 weather pattern. '''EventDay00''' will occur on specific events like [[Bunny Day]] and the [[Bug
===Weather patterns table===
The following table lists how each weather pattern looks like<ref>[https://docs.google.com/spreadsheets/d/16VjCWO94jG_QexsBAjoKLntyfUF_e-B6WPRl8l-jM1o/edit#gid=1139529364 Weather Rates and Patterns: Weather Patterns Only sheet]</ref>:
{| class="article-table"
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NH-Weather-Sunny.jpg|Sunny weather
NH-Weather-Cloudy.jpg|Cloudy weather
NH-Weather-Rain clouds.jpg|Rain clouds
NH-Weather-Rain.jpg|Rainy weather
NH-Weather-Heavy rain.jpg|Heavy rain
</gallery>
==Special cloud types==
During certain times of the year, special clouds can appear during hours which are '''clear/fine''' or '''sunny'''. These can help to identify your day's weather pattern, and since their appearance has a random factor involved, their presence can also rule out some seeds and speed up the process.
===Cumulonimbus===
'''Possible between these dates''': July 21 to September 15 (northern hemisphere), January 21 to March 15 (southern hemisphere)
These clouds appear between 9 AM and 9 PM. They appear roughly 5 minutes after the start of the hour, and disappear roughly 5 minutes before the end of the hour.
'''Example images''':
<gallery>
ACNH cumulonimbus clear.jpg|☀️ Clear/Fine
ACNH cumulonimbus sunny.jpg|🌤 Sunny
</gallery>
===Cirrus or cirrocumulus===
'''Possible between these dates''': September 16 to November 30 (northern hemisphere), March 16 to May 31 (southern hemisphere)
This period has two kinds of special clouds: cirrus (on days with patterns named 'FineXX') and cirrocumulus (on days with other patterns).
These clouds appear between 6 AM and 4 AM. They can last multiple hours, but will only appear once in a day, so if they disappear at any point, they won't come back later that day. They appear roughly 10 minutes after the start of the hour, and disappear roughly 10 minutes before the end of the hour.
'''Example images''':
<gallery>
ACNH cirrus clear.jpg|Cirrus (☀️ Clear/Fine)
ACNH cirrus sunny.jpg|Cirrus (🌤 Sunny)
ACNH cirrocumulus clear.jpg|Cirrocumulus (☀️ Clear/Fine)
ACNH cirrocumulus sunny.jpg|Cirrocumulus (🌤 Sunny)
</gallery>
===Billow clouds===
'''Possible between these dates''': December 1 to February 29 (northern hemisphere), June 1 to August 31 (southern hemisphere)
These clouds appear between 6 AM and 5 PM. They can last multiple hours, but will only appear once in a day, so if they disappear at any point, they won't come back later that day. They appear roughly 10 minutes after the start of the hour, and disappear roughly 15 minutes before the end of the hour.
Be careful with these: during the evening, they can be quite difficult to identify!
'''Example images''':
<gallery>
ACNH billow clear.jpg|☀️ Clear/Fine
ACNH billow sunny.jpg|🌤 Sunny
</gallery>
===Thin clouds===
'''Possible between these dates''': March 1 to May 31 (northern hemisphere), September 1 to November 30 (southern hemisphere)
These clouds may appear between 6 AM and 4 AM. They can last multiple hours, but will only appear once in a day, so if they disappear at any point, they won't come back later that day. They appear roughly 5 minutes after the start of the hour, and disappear roughly 10 minutes before the end of the hour.
'''Example images''':
<gallery>
ACNH thin clear.jpg|☀️ Clear/Fine
ACNH thin sunny.jpg|🌤 Sunny
</gallery>
==Wind patterns==
*'''Calm''' wind will always have a wind speed of 0. It only happens if the wind direction is changing. This will always occur 2 times each day, regardless of the pattern of the day: one in the morning at 6 AM, 7 AM, or 8 AM and one in the evening at 6 PM or 7 PM.
*'''Weak''' wind will have a wind speed of 0-3, depending on the island's weather seed.
There are also 2 directions that the wind can blow at a certain time: west and east. Basically, when a new island is created, the game chooses one direction as the sea wind during the daytime, and the other direction gets assigned as the land wind during the nighttime.
===Wind patterns table===
The following lists the possible wind patterns for each hour for each weather pattern<ref>[https://docs.google.com/spreadsheets/d/16VjCWO94jG_QexsBAjoKLntyfUF_e-B6WPRl8l-jM1o/edit#gid=1304541406 Weather Rates and Patterns: Wind Patterns Only sheet]</ref>:
{| class="article-table"
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==Weather probabilities==
===Northern hemisphere===
The following table list the probabilities that a specific weather seed will have a specific pattern for a certain day in the northern hemisphere<ref>[https://docs.google.com/spreadsheets/d/16VjCWO94jG_QexsBAjoKLntyfUF_e-B6WPRl8l-jM1o/edit#gid=2033074870 Weather Rates and Patterns: Weather Rates North (in %) sheet]</ref>:
{| class="article-table"
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<sup>1</sup> Commun00 is the weather on [[Harv's Island]], therefore it is not possible for that pattern to occur on normal weather seeds.
===Southern hemisphere===
The following table list the probabilities that a specific weather seed will have a specific pattern for a certain day in the southern hemisphere<ref>[https://docs.google.com/spreadsheets/d/16VjCWO94jG_QexsBAjoKLntyfUF_e-B6WPRl8l-jM1o/edit#gid=1446043481 Weather Rates and Patterns: Weather Rates South (in %) sheet]</ref>:
{| class="article-table"
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==References==
<references />
Page source: [https://animalcrossing.fandom.com/wiki/Weather/New_Horizons_mechanics Weather/New Horizons mechanics on Animal Crossing Wiki]
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