What you need to do is set a temperature that you can achieve all year long.
Most cameras provide a -45° delta from ambient. In SE QLD it can still be 30° C at midnight in summer so I can get the camera down to -15°C in summer and I base my darks library at that temp'. Otherwise if you go for -20 or lower you may have to save a set of summer darks at a higher temp' and winter darks at the lower temp'.
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