The 100th Meridian has shifted 140 miles east since 1980

The U.S. 100th meridian approximately marks the border within humid subtropical climates in the east and the semi-arid climate in the west.

According to the online magazine Yale Environment 360 this the North American climate boundary that visibly separates the humid eastern part of the American continent from the more arid western plains has shifted 140 miles east since 1980.

The animated map below shows what will happen to the 100th meridian in 2050 and 2070.


Af – Tropical rainforest climate, Am – Tropical monsoon climate,Aw – Tropical savanna climate, BSh – Hot semi-arid climates, BSk – Cold semi-arid climates, BWh – Hot desert climates, BWk – Cold desert climates, Cfa – Humid subtropical climate, Cfb – Oceanic climate, Cfc – Subpolar oceanic climate, Csa – Hot-summer Mediterranean climate, Csb – Warm-summer Mediterranean climate, Cwa – Humid subtropical climate, Cwb – Subtropical highland oceanic climate, Dfa – Hot humid continental climate, Dfb – Warm humid continental climate, Dfc – Subarctic climate, Dfd – Subarctic climate, Dsa – Hot humid continental climate, Dsb – Warm humid continental climate, Dsc – Subarctic climate, Dwa – Humid continental climate, Dwb – Warm humid continental climate, Dwc – Subarctic climate, ET – Tundra climate.

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