The boundaries of the Köppen system (as well as other climate classification systems) are

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

is this for the e2020 class

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added