An atlas containing maps and tables of climatic data usually including distributions of highest and lowest temperatures by month, temperature means by month, diurnal ranges of temperature by month, frequency of wind direction and speed for several class values, monthly average and extreme precipitation, number of days per month with temperatures above and/or below specified values, etc. , at fixed locations over land, or within geographic areas at sea. Marine climatic atlases often include frequencies of sea level pressure values, wave heights, gale-force winds, and other phenomena of significance to mariners.