As far as I know, Rodez used to have year-round service from Stansted, even if it was just 1 or 2 days per week. It looks as if Ryanair are suspending all winter flights at Rodez (all routes, not just STN) from early Nov 14 to Mar 15. Beyond March 2015, nothing is on sale yet with Ryanair.
Of course somewhere like Rodez in a very rural area is unlikely to see much inbound demand in winter. Besides Ryanair, the only route at Rodez is a PSO route to Paris. Is this perhaps a precursor to Rodez being dropped completely from Ryanair's network ? Fares on STN to RDZ from late August do not suggest great demand outside high summer...
They have being there 11 years, has STN ever being seasonal over this period. It was year round last year for sure but not sure before this?