# xarray.groupers.SeasonGrouper

### *class* xarray.groupers.SeasonGrouper(seasons)[[source]](https://github.com/pydata/xarray/blob/main/xarray/groupers.py#L806-L878)

Allows grouping using a custom definition of seasons.

* **Parameters:**
  **seasons** ([sequence](https://docs.python.org/3/glossary.html#term-sequence) of [`str`](https://docs.python.org/3/builtins/stdtypes.html#str)) – List of strings representing seasons. E.g. `"JF"` or `"JJA"` etc.
  Overlapping seasons are allowed (e.g. `["DJFM", "MAMJ", "JJAS", "SOND"]`)

### Examples

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```pycon
>>> SeasonGrouper(["JF", "MAM", "JJAS", "OND"])
SeasonGrouper(seasons=['JF', 'MAM', 'JJAS', 'OND'])
```

The ordering is preserved

```pycon
>>> SeasonGrouper(["MAM", "JJAS", "OND", "JF"])
SeasonGrouper(seasons=['MAM', 'JJAS', 'OND', 'JF'])
```

Overlapping seasons are allowed

```pycon
>>> SeasonGrouper(["DJFM", "MAMJ", "JJAS", "SOND"])
SeasonGrouper(seasons=['DJFM', 'MAMJ', 'JJAS', 'SOND'])
```

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#### \_\_init_\_(seasons)[[source]](https://github.com/pydata/xarray/blob/main/xarray/../doc/<string>)

### Methods

| [`__init__`](#xarray.groupers.SeasonGrouper.__init__)(seasons)   |                                                            |
|----------------------------------------------------------------------|------------------------------------------------------------|
| `factorize`(group)                                                   | Creates intermediates necessary for GroupBy.               |
| `reset`()                                                            | Creates a new version of this Grouper clearing any caches. |

### Attributes

| `seasons`   |    |
|-------------|----|