cleaning rubble in Normandy 44

[Xerxes77]

This brings up another question.
If clearing rubble is tied to digging in parameter then my unit will never clear the rubble since digging in is not allowed in frozen conditions?

You cannot dig-in on Frozen ground, but the chance to clear rubble is still tied to the Parameter Data value.
If you set a value of 200 for "Digging In", your engineers will always take just 1 turn to clear RUBBLE, even in Frozen conditions. (Just tested this in Mius)