An investigation of the 28-year climatic record of the Pacific Northwest in Oregon and Washington reveals the natural seasons, subseasons, and singularities evident in the record. So much emphasis is placed on the topography and temperature of each station site that the term topothermal is introduced and defended. Statistical analyses of the topothermal parameters throughout time and is space made possible the identification of coherent topothermal climatic zones on the surface of the Pacific Northwest in Oregon and Washington.