The tables give the normals for maximum and minimum temperatures based on weather data collected from 1981 to 2010 by the US National Climatic Data Center. You can jump to a separate table for each region of the state: Eastern Shore, Central Maryland and Western Maryland.
A computer application is simply another word for a computer program or an executable file. Examples would be games, word processors (such as Microsoft Word), and media players.
An operating system (OS) is the main program on a computer. The OS also determines how you see information and perform tasks. Most operating systems use a graphical user interface (GUI), which presents information through pictures (icons, buttons, dialog boxes, etc.) as well as words.