Table 4.

Change in mean and variance at the Cloquet Forestry Center (CFC) and Marcell Experimental Forest (MEF) in the pre- and post-1976 time periods, as well as the results of the Mann–Kendall test for the significance of trends in time series data, and F test to test differences in variance between the two time periods. Mann–Kendall and F test p-values and test statistics indicate model significant and fit

	Pre-1976		Post-1976		Mann–Kendall		F test
Record	Mean °C	Variance	Mean °C	Variance	P	T	P	F
CFC Station	3.33	1.33	4.60	3.00	<0.001	0.230	0.14	0.79
CFC CRU	3.21	1.60	4.78	2.83	<0.001	0.282	0.10	0.78
MEF Station	2.70	1.54	4.23	3.01	0.469	0.001	0.08	0.72
MEF CRU	3.21	1.06	4.78	2.89	<0.001	0.282	0.80	0.96