Table 3. Pearson correlation matrix of climatic variables.

	TMP	SOLA	SUN	1000	2000	3000	4000	5000	10000
TMP	1
SOLA	0.56**	1
SUN	0.35	0.76**	1
1000	0.58**	0.95**	0.80**	1
2000	0.62**	0.94**	0.82**	0.96**	1
3000	0.63**	0.95**	0.84**	0.96**	0.97**	1
4000	0.62**	0.95**	0.85**	0.96**	0.98**	0.99**	1
5000	0.61**	0.96**	0.86**	0.96**	0.98**	0.99**	1.00**	1
10000	0.62**	0.96**	0.86**	0.96**	0.98**	0.99**	1.00**	1.00**	1

TMP: Annual mean temperature.

SOLA: Annual mean solar radiation.

SUN: Annual total sunshine duration.

1000–10000: Annual mean effective day length at 1000 to 10000 lx.

^**p<0.0001.

^*p<0.005.