When did the weather get cold?

Autumn has begun. According to the survey, the weather began to get cold in early autumn. Beginning of autumn is the first solar term in autumn, which marks the official start of the season in Qiu Meng. Autumn means hot summer and cooling down. When I arrived in early autumn, the phoenix tree began to shed its leaves, hence the idiom "Ye Zhiqiu". Autumn is the transitional season when the weather turns from hot to cold, and then from cold to cold. After beginning of autumn, there are still volts, and autumn tigers still exist. So we should pay attention to heatstroke prevention. However, the weather has changed, and it has become cold since beginning of autumn.