Abstract: The horizontal distributions of covariance of geopotential height and temperature are extremely inconsistent with the hypothesis of two dimensional isotropy. However, the distributions of correlation in the region on the north of 35°N fairly agree with the hypothesis of isotropy, but it becomes more nonisotropic on the south of 35°. The isoplethic patterns of correlation around the stations near the mean subtropical jet stream show a ellipses-like figure, their major axes are orientated usually along the jet stream.