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It was all known that Lhasa went through a high temperature of30.8$^{\circ}$C in late June 2019, which hit record highs. To better understandthe reasons, based on observations recorded at automatic weather stations inLhasa, we studied the characteristics of temperature variation at multiple timescales using the linear trend method, Mann-Kendall mutation test, morletwavelet analysis, R/S analysis and so on. The results showed that: (a) Theannual mean temperature (AMT) is rising at a rate of 0.5$^{\circ}$C/10yr, andthe average temperature for different seasons also increased significantly,especially in winter. (b) Although there was an intersection in 1995, we foundthat AMT, did not pass the reliability test of significance level ${\alpha}$=0.05, this means there are no abrupt changes for AMT, the values are7.97$^{\circ}$C and 9.15$^{\circ}$C respectively before and after theintersection point. (c) AMT has a periodic oscillation for 18~25yr and 25~32yrbased on a mass of data and the wavelet variance diagrams in Lhasa. AMT has amain cycle of 28yr, cyclic Patterns of temperature changes in spring, summerand autumn is similar to AMT, but it is relatively complex in winter. (d) TheHurst index of AMT and different seasons demonstrates that the temperature arelikely to continue to rise in the future in Lhasa.

Spatio-temporal variation of temperature for the recent 40 years in Lhasa