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I hope you are not expecting to get the right answer based on this explanation given by you. This doesn’t even explain what your subject area is and what you need the data for. With different data and research work, different methodologies and time durations are suggested. So, saying that 30 minutes is enough and that any 30 minutes data around the year is acceptable depends on the research type and research purpose. Please clear it first to get the reliable data.

Hi Berat, I agree with Emre on this. With such a little information, it is really impossible to provide you with the right answer.  For this discussion to be more successful and helpful to you and others, I would like it if you can add a bit more details.

The data collection and research methodology depend on the research needs and the research hypothesis you have set in the draft. Understand the need and study whether the approach will answer your research question or not.   I agree that the information is not enough but I didn’t want you to leave with no suggestion. So, get to understand the research needs.  

The technique of sliding window aggregation does not apply on any 30 minutes of the year. You have to note down the maximum precipitation everyday in consideration with the standard duration selected. The highest value will be considered as the maximum value for that year.   Your question surely needs further explanation but if you can not do that, then I would suggest you consider whether 30 minutes is enough for your project or not.   Also, below I am attaching the link to the illustration of this method. So, please refer to this link to get a better idea.  https://docs.wavefront.com/query_language_windows_trends.html