From ca. 50 to 20 ka, Summer Lake, Oregon, rose and fell in tune with North Atlantic interstadial and stadial climatic oscillations, respectively. This record exhibits the complete morphology of the North Atlantic millennial-scale climate-change signal including Dansgaard-Oeschger oscillations, Heinrich events, and Bond cycles. The phase relationship of these climate change records (high Summer Lake during warm North Atlantic; low during cold) is demonstrated at millennial-scale resolution by the relative positions of the Mono Lake and Laschamp paleomagnetic excursions in these records. These results, in conjunction with comparisons of historical climate records, also presented here, imply a direct temporal connection at the subcentury scale between the North Atlantic and the northwestern Great Basin via an atmospheric teleconnection.