Providing Long Range Forecast (LRF) for weather should remain out of the scope of honest, public weather sites like Windy, as it would require huge scientific and computational effort.
There are many so-called "Almanacs" that boast of providing weather forecasts over months or even years: none of them are trustworthy.
A good sample for such an Almanac is here (ouch! they even use Windy widgets :o))); as one can see, it is rather kinda horoscope...
Best would be to use directly WMO's LRF centers when required; they generally provide public data with pertinent documentation.
The full list is here, a good sample (DWD) is here.