I cannot find the humidity specs for your motherboard, which I assume would be more important. All I see is the operating temperature.
I checked the datasheets on the processor, and could not find humidity specs.
So, you should contact asrock for the environmental specs on the board, while we wait for one of the intel support engineers to comment on the humidity specs for the processor.
For the board to not specify the humidity specs seems unusual to me, since it is an industrial board.
Also, I have moved this to the forum.
daniel74: Since the Intel® Core™ processors are intended for home use, they should be able to handle indoor humidity without any problem. It does not matter the zone or climate, if it is used as it should be, the humidity will not generate any issue to the unit.
Then, humidity is important for packaging or storage. Are you looking for this information for this purpose?