There are several grades according to whether the weather conditions will cause fire.

According to the Code for Fire Protection Design of Buildings (GB 500 16-20 14), the possibility of fire caused by weather conditions is divided into three levels:

1. High risk level: when the atmospheric temperature is high, the humidity is low and the wind speed is high, it is easy to cause fire.

2. Medium risk level: When the atmospheric temperature is moderate, the humidity is low and the wind speed is high, it is easy to cause fire.

3. Low risk level: when the atmospheric temperature is low, the humidity is high and the wind speed is low, it is not easy to cause fire.