Abstract

RUIZ ALVAREZ, Osías et al. Monthly trend of maximum and minimum temperatures in Aguascalientes, Mexico. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.spe13, pp.2535-2549. ISSN 2007-0934.

The objective of this study was to analyze trends in monthly average maximum (Tmax) and minimum (Tmin) temperature in Aguascalientes and time series of at least 30 years. Statistical analysis was performed using the Mann-Kendall methodology and the exchange rate was calculated with Theil slope. From 612 Tmin series, 365 were not significant, whereas 247 were significant, of these series with significant trend (p≤ 0.05), 129 had positive trend and 118 had negative trend. From 672 Tmax series, 448 were not significant, whereas 224 were significant, of these series with significant trend (p≤ 0.05), 167 had positive trend and 57 had negative trend. The highest positive trend (1.33 °C decade-1) from Tmin was in April and the lowest (0.09 °C decade-1) in July and September, the average annual positive trends was 0.50 °C decade-1; December had the highest negative trend (-1.42 °C decade-1) and August had the lowest (-0.14 °C decade-1), the average annual negative trends was -0.59 °C decade-1. Regarding Tmax, April had the highest positive trend (1.59 °C decade-1) and December had the lowest (0.18 °C decade-1), the average annual positive trend was 0.61 °C decade-1; October had the highest negative trend (-1.51 °C decade-1) and September had the lowest (-0.19 °C decade-1), the average annual negative trends was -0.68 °C decade-1. In Aguascalientes, a small number of localities are cooling and a significant portion are warming, the region that is showing temperature changes is having a more extreme weather and changes in the diurnal temperature range (RTD).

Keywords : climate change in Aguascalientes; diurnal temperature range; Mann-Kendall regression; time series; weather stations.