![]() ![]() ![]() Also, each map covers 7.5-minutes of Latitude and Longitude. These maps are at a scale of 1:24,000, or 1-inch on the map equals about 2,000-feet on the ground. The city of El Cajon, just 12 miles (19 km) inland from downtown San Diego, averages January lows of 42 ☏ (6 ☌) and August highs of 88 ☏ (31 ☌). The popular USGS topographic quadrangle maps (often called 'topos' or 'quads') are available for the entire state. Thus, for example, downtown San Diego averages January lows of 50 ☏ (10 ☌) and August highs of 78 ☏ (26 ☌). Even in the absence of June gloom, inland areas experience much more significant temperature variations than coastal areas, where the ocean serves as a moderating influence. Sometimes the June gloom lasts into July, causing cloudy skies over most of San Diego for the entire day. Frequently, particularly during the "May gray/June gloom" period, a thick "marine layer" cloud cover keeps the air cool and damp within a few miles of the coast, but yields to bright cloudless sunshine approximately 5–10 miles (8–16 km) inland. In San Diego, this is mostly because of the city's topography (the Bay, and the numerous hills, mountains, and canyons). The climate in San Diego, like most of Southern California, often varies significantly over short geographical distances, resulting in microclimates. ![]()
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