Andes 4 Argentina 4 Gas consumption 4 Hard disk storage 4 Heating 4 Heating degree-days 4 Intra-annual variability 4 Natural gas 4 Natural gas consumption 4 Population statistics 4 Principal component analysis 4 Temporal distribution 4 Temporal statistics 4 Trends 4 University of Delaware 4 annual variation 4 heating 4 natural gas 4 principal component analysis 4 spatial variation 4 temporal distribution 4 temporal variation 4 trend analysis 4