The weather is cold, and the clutch is a little hard and squeaky. How to solve it?

The fault is probably caused by the lack of lubricating oil in the clutch pedal return spring. You can add some lubricating oil to the return spring. If there is still abnormal noise after adding lubricating oil, it may be that the clutch pedal is badly worn and needs to be replaced. Another possibility is that the release bearing and clutch pressure plate in the clutch system are worn. The specific fault point needs to be checked before it can be determined.