Some people want to quote two poems to illustrate that latitude is one of the main factors that determine the arrival of phenology, but they can't think of it at the moment.

Phenomenon: In August, the northern frontier was snowed heavily, the north wind roared, and the white grass was broken.

Reason: This reflects the phenological phenomenon and is related to latitude. The northern frontier fortress has high latitude and cold weather, so it snowed heavily in mid-August when the original land was still in midsummer.