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The dynamics of the climate system has been investigated by analyzing the complex seasonal  oscillation of monthly averaged temperatures recorded at 1167 stations covering the whole  USA. We found the presence of an orbit-climate relationship on time scales remarkably  shorter than the Milankovitch period {related to the nutational forcing}. The relationship  manifests itself through occasional destabilization of the phase of the seasonal component  due to the local changing of balance between direct insolation and the net energy received  by the Earth. Quite surprisingly, we found that the local intermittent dynamics is modulated  by a periodic component of about 18.6 yr due to the nutation of the Earth, which represents the  main modulation of the Earth's precession. The global effect in the last century results in  a cumulative phase-shift of about 1.74 days towards earlier seasons, in agreement with the  phase shift expected from the Earth's precession. The climate dynamics of the seasonal cycle can  be described through a nonlinear circle-map, indicating that the destabilization process can  be associated to intermittent transitions from quasi-periodicity to chaos

The complex dynamics of the seasonal component of USA's surface temperature