You cannot know for certain the hourly variation based on monthly data, there is no absolute way of doing this as less information is provided to supposedly generate more information.

This question was addressed during this discussion: https://www.researchgate.net/post/How_should_one_generate_hourly_data_for_temperature_from_monthly_or_daily_data

To recap, you won't get real data, just simulated. However, you should go through that thread for more information on how to proceed.

Understanding the pattern in monthly data, defining the distribution methds and identifying the best one may be helpfull in this regard.

Thanks

سلام

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