This is the 3908th most frequent Chinese word.
不致于
Not to the extent of; unlikely to reach that point.
不致于 is used here to imply that despite the cold weather, it's not severe enough to prevent going for a walk outside.
天气虽然冷，但不致于无法外出散步。
The weather is cold, but not to the extent that going for a walk outdoors is impossible.
不致于 illustrates that although the tasks are numerous, they are still manageable and completion is achievable.
任务繁重，但不致于让我们无法完成。
The workload is heavy, but not to the point where we can't complete it.
不致于 conveys that though injured, the extent of the injury does not impact his daily routines.