Which of the following factors is NOT one that affects scene safety?

Weather conditions are indeed a significant factor that can impact various aspects of a fire scene, including visibility, the ability of responders to carry out their duties, and the potential for further hazards. However, while weather may create challenging conditions, it does not inherently affect the immediate safety of the scene to the same extent as structural stability, electrical hazards, or standing water.

Structural stability is vital because compromised structures can lead to collapses, posing a direct risk to responders. Electrical hazards are critical concerns as exposed wires or live circuits can lead to electrocution. Standing water can present slip hazards or increase the risk of electrical shock if connected to electrical hazards. Each of these factors requires immediate assessment and management to ensure the safety of personnel on the scene.

In contrast, while weather conditions should certainly be taken into consideration for planning and operational safety strategies, they typically do not pose a direct, immediate risk in a way that the other factors do. Thus, it stands out as the factor that does not directly affect the scene's safety in the same manner as the others.