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how do I know that my time series data has a seasonal trend

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I have a variable of Zenith Wet delay (represent the effect of water vapor on GPS signal) with time resolution 1-hour for three years, it's just a vector of one coulmn, and I want to use FFT to know if my data has a seasonal cycles or not, but I don't know how to put the Fs in it or how to choose the better sampling rate of my data.
any help please.
Thanks

Accepted Answer

Vaibhav Tomar
Vaibhav Tomar on 27 May 2020
Please refer to the following link for an example on how to apply Sn×m seasonal filters to deseasonalize a time series (using a multiplicative decomposition). You can use the same technique for checking seasonality of your time data.
You can also refer here for more information and different ways to check seasonality:

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