Table 2. Simple linear regression coefficients of the monthly climatic variables over the time (1997–2008) in the middle region of Chongqing.

Month	T	RH	Rainfall	SD
January	0.4552	–0.5588	0.1515	0.5371
February	1.6385	–1.0961	1.4192	2.0542
March	3.1030**	–0.9689	1.7543	3.4359**
April	2.7998*	–2.1578	1.4771	3.4948**
May	1.7876	–2.1705	0.1171	2.2140*
June	0.1580	1.3125	1.9869	0.5271
July	–0.6712	–0.7876	–0.0102	–1.1510
August	–1.5422	0.0941	–0.7275	–0.8591
September	–4.5770***	–0.0332	–2.9418*	–2.5712*
October	–3.5901**	–0.3751	–2.3973*	–2.7427*
November	–1.3460	–0.2907	–1.8985	–1.4752
December	–0.0341	–0.2723	–0.8396	–0.7386

T: average temperature; RH: relative humidity; SD: sunshine duration. *p≤0.05, **p≤0.01, ***p≤0.001.