Hi In Altissimus,
This time of year, when the onset of winter is rapidly approaching and the temperatures dip, you may find Icing will be a factor. Say on the ground it is 4 degrees, as low as 2,000' could put you in icing conditions if you're in visibile moisture and that just doesn't mean cloud, it also means rain showers etc.
Also as Evo suggests if you're home airfield doesn't have published IAP approaches then you'll need at least basic VFR weather to get back down. If, however your field has an ILS and you have an FM Immune aircraft (if in controlled airspace) then you can go back in on an IFR clearance to the lower minimums if you're instructor has an IR.
Another point is if there is a strong wind at altitude across the published hold you are trying to fly... it'll make life very difficult in the early days of IR training (or IMC training in this case).
Also may not be a wise idea to try an NDB approach at a coastal airfield at night with thunderstorms off the coast, if you do, then you may see some interesting results with the ADF (or RMI if you're very lucky) needle. (No prizes for guessing which State of America I did my IR in!). :-)
Best wishes,
Charlie Zulu.