US temperature anomalies are accelerating toward dangerous warming thresholds with a 0.44°C increase over just four years.

The US temperature anomaly has risen sharply from 0.84°C above baseline in 2021 to 1.28°C by end of 2024, representing a 52 percent acceleration in the past four years. The rate of increase is steepening: the first two years added 0.05°C, but the most recent two years added 0.39°C. This is not a plateau—it is an active upward trajectory.

If the current acceleration rate continues, US temperatures could approach or exceed 1.6–1.8°C anomaly by 2029, pushing into regimes associated with ecosystem stress, extreme weather frequency shifts, and cascading climate impacts. The trajectory suggests the window for stabilization is narrowing rapidly. Even a slowdown to the 2021–2023 pace would still deliver 1.5°C+ anomaly within five years.

Infrastructure tied to historical climate norms—water systems, power grids, agriculture, and insurance portfolios—faces accelerating stress as temperature anomalies drive more frequent heat extremes, drought, and precipitation volatility. Real estate in heat-vulnerable regions, snow-dependent operations, and assets dependent on stable growing seasons bear concentrated risk from this rate of change.