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Based on the 120-station North American radiosonde network, temperature trends for 100–50-mb (low stratosphere), 300–100-mb (tropopause), and 850–300-mb (troposphere) layers, and Earth’s surface, are evaluated for six 10° latitude bands extending from 20°–30°N to 70°–80°N for the 20-yr interval 1975–94. Confidence estimates are indicated by two standard errors of the least squares regression. In the average for the six latitude bands, the 100–50-mb annual temperature trend is −0.5°C decade−1 and the 850–300-mb trend is 0.2°C decade−1. In spring at 70°–80°N, the 100–50-mb and 300–100-mb layers cool by almost 2°C decade−1. The 300–100-mb layer cools by 0.7°C decade−1 relative to the 850–300-mb layer at 70°–80°N, but the two layers have the same warming trend at 20°–30°N, indicating the transition from the 300–100-mb layer being mostly in the stratosphere in polar regions to mostly in the troposphere in the northern subtropics. The surface warms much more than the troposphere at 70°–80°N (showing th...

Variation with Height and Latitude of Radiosonde Temperature Trends in North America, 1975–94