Table 1 The average, maximum, minimum value and range value of the temperature series in different decades in the Three Rivers’ Headstream Region (°C).

	Area	From 1960 to 2015	1960s	1970s	1980s	1990s	00s in 21st	2010–2015
Mean value	LARHR	2.54	1.95	2.08	2.31	2.49	3.39	3.53
	YERHR	− 0.47	− 1.14	− 0.89	− 0.62	− 0.43	0.27	0.43
	YARHR	− 1.52	− 2.09	− 1.88	− 1.85	− 0.71	− 0.71	− 0.66
Maximum value	LARHR	4.05	2.55	2.59	2.80	3.62	4.05	3.84
	YERHR	0.81	− 0.59	− 0.22	− 0.03	0.81	0.81	0.71
	YARHR	− 0.06	− 1.57	− 1.55	− 1.30	− 0.06	− 0.06	− 0.37
Minimum value	LARHR	1.13	1.13	1.48	1.48	1.53	2.73	3.20
	YERHR	− 1.92	− 1.72	− 1.92	− 1.69	− 0.97	− 0.26	0.29
	YARHR	− 3.08	− 2.69	− 2.50	− 3.08	− 1.33	− 1.33	− 0.75
Range value	LARHR	2.92	1.43	1.11	1.32	2.09	1.33	0.64
	YERHR	2.73	1.14	1.71	1.65	1.78	1.07	0.42
	YARHR	3.02	1.12	0.95	1.78	1.27	1.27	0.38

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