I'm thinking having seasons, but like deserts and snowy mountains would be relitivally the same, while plains/forest,etc would get snow at Z time of the year, with no snow at X time. Also, rivers would dry up every once in a summer, and flood sometimes too. (When it floods, have maybe a thunderstorm with alot of rain.) To wrap it all up, a calendar to warn when a flood or dry up river MIGHT(not 100% accurate, maybe like 75%) happen.
Its almost how a map is made, but with different ingredients.
Please comment/reply on what could be better/changed and what is good.