For better readability of the table, pass into the landscape mode.
El Salvador is a country in Central America. Here's the map. Its name comes from the Spanish for "The Savior", the person who saves, referring to Jesus Christ.
Lying along the Pacific ring of fire, there is significant tectonic activity including frequent earthquakes and volcanic activity. There are only 2 seasons; the dry season (mid October to mid May) when it hardly ever rains and the wet season, (mid May to mid October).
Los Cobanos (situated on the Pacific Ocean) is one of the most popular diving areas (80 Km from San Salvador). During the summer, and with the right conditions, you can see Morays eels, Angel fish, Eagle mantas, Green turtles, lobsters, etc.
If you want to dive in the winter season, why not try crater diving at Coatepeque or Illopango lakes?