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rnso
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How to interpret these acf and pacf plots

Following are acf and pacf plots of a monthly data series. The second plot is acf with ci.type='ma':

enter image description here

The persistence of high values in acf plot probably represent a long term positive trend. The question is if this represent seasonal variation?

I tried to see different sites on this topic but I am not sure if these plots show seasonality.

ACF and PACF plot analysis

Help interpreting ACF- and PACF-plots

Understanding the blue dotted lines in an ACF from R

Autocorrelation and partial autocorrelation interpretation

Edit: following is the graph for lag upto 60:

enter image description here

Following are plots of diff(my_series):

enter image description here

And upto lag 60:

enter image description here

rnso
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