How long has it been frozen?

The freezing time varies from region to region, generally starting from 10. Freezing refers to the first frost, which is the eighteenth of the 24 solar terms. The first frost is the last solar term in autumn and the transition from autumn to winter. The first frost solar terms are characterized by cold weather in the morning and evening, hot weather at noon, large temperature difference between day and night, and obvious autumn dryness. Because "frost" is a manifestation of cold weather and large temperature difference between day and night, it is named after "first frost".

The freezing time varies from region to region, generally starting from 10. Freezing refers to the first frost, which is the eighteenth of the 24 solar terms. The first frost is the last solar term in autumn and the transition from autumn to winter. The first frost solar terms are characterized by cold weather in the morning and evening, hot weather at noon, large temperature difference between day and night, and obvious autumn dryness. Because "frost" is a manifestation of cold weather and large temperature difference between day and night, it is named after "first frost".