What term describes visibility that varies at different points around the observation location?

The term that describes visibility varying at different points around the observation location is "variable." In meteorological contexts, variable visibility indicates that the range of sight may differ significantly in different directions or distances from a central observation point. This can occur due to various factors such as localized weather conditions, topographical features, or obstructions that affect visibility in specific areas.

In contrast, the other terms do not accurately capture this phenomenon. "Consistent" suggests uniformity and predictability in visibility across all directions, while "uniform" implies that visibility is the same everywhere around the observational point. "Non-linear" generally refers to relationships or changes that do not follow a straight line and does not pertain specifically to variability in visibility. Thus, "variable" is the correct term to describe the situation where visibility differs in different directions around the observation location.