In reply to French Erick:
sorry I got interrupted and my post ended up unclear.
... to climb a buttress steep route (grade IV and above).
It is winter climbing, clearing is part of the game. You get a climb in conditions (hopefully) and those are on the helpful side (dry cracks...) or unhelpful (vergalassed, heavily hoared up...).
The variation in conditions could affect the grade on that given day to a certain extent.
Anyways, at no point this season was a climb (as defined above) unclimbable because of too much snow on it. You may decline climbing it as being too tough for the grade ( as I did early this season on a verglassed but not iced up Gargoyle wall), but someone bolder than me would have climbed it at VII,6 on that day.