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Analysis of recent trends in mean maximum and minimum temperatures in a region of the NW of Spain (Castilla y León)

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Summary

The present paper is an analysis of mean maximum and minimum temperatures carried out on monthly, seasonal and annual time-scales examining the data collected at 171 meteorological stations over a region in the North West of Spain (Castilla y León) for the period 1961–1997. Various statistical tools were used to detect and describe significant trends in these data. The magnitude of the trends was derived from the slopes of the regression lines using the least squares method, and the statistical significance was determined by means of the non-parametric Mann-Kendall test. The pattern obtained is quite similar for mean maximum and minimum temperatures with increases in all months of the year, and in the annual series. The seasonal series corresponding to winter and summer also followed this same pattern. Spring and autumn were found to be more irregular. Because maximum temperature increased at a higher rate than minimum temperature in this period, an increase in the annual diurnal temperature range (DTR) was observed. The correlation between the North Atlantic Oscillation (NAO) and the regional maximum and minimum temperatures and DTR series for the period 1961–1997 have also be studied in this paper.

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del Río, S., Fraile, R., Herrero, L. et al. Analysis of recent trends in mean maximum and minimum temperatures in a region of the NW of Spain (Castilla y León). Theor. Appl. Climatol. 90, 1–12 (2007). https://doi.org/10.1007/s00704-006-0278-9

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