A small section of land within a winemaking region that, because of its unique location, boasts a climate well suited for growing a certain varietal of grape (or so the winemaker will claim on the label). A microclimate can be as small as the north-facing side of a hill, which may get less sun and wind than the other side but more morning dew and have a steeper slope. A grape grower will then plant a varietal that grows well in that particular microclimate. Rain, fog, altitude, ocean breezes, and temperature are all factors in a vineyard's microclimate.