Before that, there was the and is the ongoing mud season of spring, before that a mild winter where the ground was not frozen solid. While the press, pundits and experts have made predictions, the fact is for the last six months getting around on the front lines has favored holding and defending more than attacking. Its like the Revolutionary War, where historians try to make the long periods of nothing happening on the battlefield sound vitally important.
Ukraine held, got equipment, and trained. Russia mobilized untrained conscripts and attacked, instead of holding and correcting issues with training, logistics, command and control. Because of the weather and equipment issues, neither side may try to attack until the end of April or May.