Isopleths are contour maps that represent various data such as, temperature, rain, wind, pressure, etc. This map shows the 50 year averages of north to south winds as a function of the latitude and time of year (months). These guidelines were constructed to help observe salmon migration, brought on by the transition into spring, which is brought on by the reversal of winds. So even though it is only displaying wind speed, this can be an identifying factor in other questions and categories.
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