Table 1: Descriptive statistics for monthly average temperature from 1961 to 2010 (unit: °C).

Jan.Feb.Mar.Apr.MayJune

Maximum5.105.205.808.3013.1018.00
Minimum−5.20−5.20−2.301.908.4012.00
Mean0.830.542.215.6810.5814.78
Standard deviation2.482.391.851.361.201.07
Variation coefficient2.994.440.840.240.110.07

JulyAug.Sep.Oct.Nov.Dec.

Maximum21.0021.5016.9013.208.307.10
Minimum13.9014.6011.607.602.70−2.80
Mean16.9917.0413.9810.035.802.49
Standard deviation1.591.451.201.331.271.88
Variation coefficient0.090.090.090.130.220.76