Argentina 4 Climatology 4 Cubic polynomials 4 Dry days 4 Inter-decadal variability 4 Interannual variation 4 Linear trends 4 Low pass filters Patagonian coasts 4 Seasonal cycle 4 Spatial and temporal variability 4 Time series analysis 4 Wavelet analysis 4 annual variation 4 decadal variation 4 regional climate 4 seasonal variation 4 spatial variation 4 temporal variation 4 trend analysis 4 twentieth century 4 wavelet analysis 4