Table 4. Comparison of climate variables between climate events in central inland region

Seasons	Variables	Climate events		t-test
		Normal	Abnormal1)
Autumn	AT (°C)	1,327.68 ± 20.55	1,256.46 ± 26.53	2.15*
	RH (%)	70.29 ± 1.01	71.56 ± 1.23	−0.80 (p = 0.43)
	PA (mm)	56.85 ± 6.07	110.22 ± 12.56	−3.66*
	SD (h)	193.16 ± 2.99	171.13 ± 3.49	4.79*
Winter	MT (°C)	−0.55 ± 0.21	°C1.60 ± 0.56	2.17*
	RH (%)	66.00 ± 0.77	59.29 ± 1.90	3.28*
	SA (cm)	8.40 ± 1.06	11.84 ± 2.27	−1.37 (p = 0.20)
	WS (m/s)	1.56 ± 0.03	1.77 ± 0.09	−2.30*
Spring	AT (°C)	1,074.10 ± 16.53	1,026.46 ± 22.96	1.68 (p = 0.10)
	RH (%)	67.14 ± 0.92	61.13 ± 0.94	4.55*
	WS (m/s)	1.91 ± 0.03	2.04 ± 0.07	−1.85 (p = 0.08)
	PA (mm)	82.84 ± 4.48	55.10 ± 4.76	4.25*
	SD (h)	219.77 ± 4.75	204.86 ± 4.88	2.19*

Abnormal: low-temperature in autumn, severe cold in winter, drought in spring.
p < 0.05.
AT, accumulated temperature; RH, relative humidity; PA, precipitation amoun; SD, sunshine duration; MT, mean temperature; SA, snowfall amountt; WS, wind speed.