Fog is a common weather feature in Coastal Southern California national parks. Fog is typically prevalent in the summer season when rainfall is rare and temperatures are highest. Research has indicated that fog plays an important role in the ecological functioning of coastal ecosystems. For instance, fog can enhance the water status of vegetation by falling on leaves, stems, and the soil thus increasing the total water input to an ecosystem beyond precipitation alone. Fog can also enhance nutrient delivery to an ecosystem through deposition of inorganic and organic nitrogen.