According to the United States Census Bureau, the city has a total area of 24.4 square miles (63 km2). 24.4 square miles (63 km2) of it is land and 0.02 square miles (0.052 km2) of it (0.08%) is water. Due to the moderating influence of the nearby Pacific, temperatures rarely fall below freezing in winter and above 90 degress F. in summer. Like most of coastal San Diego County, cool overcast from the Pacific is common in May and June ("May gray", "June gloom"). July through September are usually the warmest months, although hot and dry Santa Ana winds can strike any month (most common Autumn) and raise risks of wildfires. Most of the rain falls between November and March, averaging about 13 inches per year, with up to 20 inches falling in the San Marcos Hills.
source: https://en.wikipedia.org/wiki/San_Marcos,_California
source: https://en.wikipedia.org/wiki/San_Marcos,_California
