Sounds like crap customer service, lousy maintenace or a lame half-arsed excuse to me. Must be a bit frustrating. If you appreciate that bad wx is bad for business then surely when it is flyable, flying schools/clubs should try their best to deliver the goods/service.
Clear blue skies and half decent vis should be taken advantage of surely. It makes business sense to sort out deicing facilities and make preparations for cold wx problems.