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The most important factor in determining local weather conditions is local terrain. This is because the physical landscape can significantly influence weather patterns and microclimates. Variations in elevation, the presence of mountains, valleys, bodies of water, and even vegetation can lead to differences in temperature, humidity, wind patterns, and precipitation.

For instance, mountainous areas can cause orographic lift, where moist air is forced to rise over the mountains, leading to increased rainfall on the windward side and drier conditions on the leeward side, known as the rain shadow effect. Similarly, urban areas with concrete and asphalt can create localized heat islands, affecting temperature and weather conditions in those regions.

While the time of year and distance from the equator do play roles in broader climatic trends, they are less impactful on immediate and localized weather conditions than the specific features of the exposed terrain. Global wind patterns certainly influence weather on a larger scale, but it's the local terrain that primarily dictates how these broader influences manifest in any given area.