Abstract: Based on Guangzhou 1873-1980 monthly mean temperature time series in an extended 3-D phase space, Lyapunov exponent λ1 is calculated for different parameters following the method in Wolf et al. (1985). Results show that for each set of parameters λ_1,2>0 (where λ₁>λ₂) and λ₃ < 0 are acquired. Our further investigation indicates that chaotic attractors exist in the short-range evolution in the climate of China's monsoon area, in good agreement with the fractional dimensios obtained by calculating the same data (peng et al. , 1989), and thereby it is shown that climate is supposed to share characteristic evolutional features typical of a system experincing behavior of chaotic mechanics.