I doubt Ichud is open in the winter but there is a year round chassidish kehilah in Monticello, with more than one shul. Unfortunately I don't know the details.
Also, there's a shul open in South Fallsburg year round. Right near Landaus/BoosurChabad Rabbi, small Kiddush every week. Very friendly people.Think it's called South Fallsburg Hebrew Association26 Lake Street
Is satmar monticello (ichud hatalmidim) open during the winter for minyanim weekdays and shabbos? asking for this shabbos specifically
That shul threw out the Rav and the South Fallsburg kollel that was learning there. The Rav now has the minyan in his house further down the road - 187 Lake St.
But the Shul still exists for anyone in the area.Very warm and welcoming.