Temp and humidity for storage optical media?

For long-term storage of optical DVD / MDisc discs and electronic devices is it better to store at a humidity of 65-70% at a temperature of 31-32ºC or at a lower humidity of 55-60% and at a high temperature of 32-33ºC? my dehumidifier device cannot keep temperature and humidity low at the same time

If the temperature difference is just around 1°C, I’d go for 10 - 15% lower humidity.

Calculator for the effects of temperature and humidity on archives in storage:

http://www.dpcalc.org/