Seasonality, Interannual Variability, and Linear Tendency of Wind Speeds in the Northeast Brazil from 1986 to 2011

Table 3

Results of the Mann-Kendall tests of the groups for seasonal and interannual variabilities.

Group	Period	Average (m/s)	Mann-Kendall test (𝑍)	Signific. (𝑃)
G1	Annual	3.37	−0.44	—
	DJF (summer)	3.05	−0.62	—
	MAM (autumn)	2.39	0.26	—
	JJA (winter)	3.84	0.26	—
	SON (spring)	4.17	−1.28	—
G2	Annual	4.11	−1.59	—
	DJF (summer)	3.91	−1.50	—
	MAM (autumn)	3.49	−1.28	—
	JJA (winter)	4.34	−1.54	—
	SON (spring)	4.70	−0.22	—
G3	Annual	1.35	−4.14	<0.001
	DJF (summer)	1.11	−3.61	<0.001
	MAM (autumn)	1.12	−4.01	<0.001
	JJA (winter)	1.59	−2.73	<0.01
	SON (spring)	1.58	−3.44	<0.001
G4	Anual	2.14	−4.10	<0.001
	DJF (summer)	1.99	−2.64	<0.01
	MAM (autumn)	1.64	−2.82	<0.01
	JJA (winter)	2.16	−2.64	<0.01
	SON (spring)	2.75	−2.51	<0.05
G5	Anual	2.83	−4.14	<0.001
	DJF (summer)	2.90	−4.06	<0.001
	MAM (autumn)	2.46	−3.09	<0.01
	JJA (winter)	2.64	−3.92	<0.001
	SON (spring)	3.33	−3.26	<0.01