ass(x) must be Date</p></dd>

  <dt>out.fmt</dt>
<dd><p>character, indicating the format of the output seasons. Possible values are: <br>
-) <kbd>seasons</kbd> =&gt;  c("winter", "spring",  "summer", autumn")  <br>
-) <kbd>months</kbd>  =&gt;  c("DJF", "MAM",  "JJA", SON") or c("DJFM", "AM",  "JJAS", ON")</p></dd>

  <dt>type</dt>
<dd><p>character, indicating which weather seasons will be used for computing the output. Possible values are: <br>
-) <kbd>default</kbd>          =&gt;  "winter"= Dec, Jan, Feb; 