High and low pressure systems?

Well, I don't completely understand how your brochure will work but in general, areas of high pressure generally mean sunny to partly cloudy skies depending on the strength of the high pressure. In the summer in Detroit, this will mean very warm temperatures in the 80's and 90's. In the winter, high pressure can mean temperatures in the 20's and 30's in Detroit. Low pressure systems are generally ociated with precipitation like rain and snow. In the summer, this can mean thunderstorms with hail as well as heavy rain. In the winter, low pressure systems will usually produce cloudy skies with snow. If it is too warm, rain may fall in the winter as well.