Climate Central Report: U.S. Summers Extend Further into Fall

Recent analyses indicate that summer temperatures are extending further into the fall across the United States, posing challenges for public health, energy consumption, agriculture, and ecosystems.

A report by Climate Central, published on September 16, 2025, reveals that in 227 out of 246 major U.S. cities analyzed (92%), summer temperatures now persist an average of 10 days longer into the fall compared to the early 1970s. Notably, cities like Miami, Florida, and San Angelo, Texas, experience summer temperatures extending 46 and 31 days later, respectively.

The National Oceanic and Atmospheric Administration (NOAA) forecasts above-normal temperatures for the upcoming fall in much of the U.S., especially in the Northeast, Southwest, and Florida. This trend aligns with broader patterns of global warming observed over the past several decades.

Public Health Implications

Prolonged exposure to high temperatures increases the risk of heat-related illnesses, particularly among vulnerable populations such as children, the elderly, and outdoor workers. Extended heat can also exacerbate respiratory conditions due to prolonged exposure to allergens and pollutants.

Energy Consumption

Longer summers lead to increased demand for air conditioning, resulting in higher energy consumption and costs. This trend places additional strain on power grids and contributes to higher greenhouse gas emissions.

Agricultural Impact

Extended heat can disrupt traditional planting and harvesting schedules, affect crop yields, and increase water demand for irrigation. Certain crops may suffer from heat stress, leading to reduced productivity and economic losses for farmers.

Ecosystem Disruption

Longer warm seasons can alter the timing of natural events such as plant blooming and animal migrations, potentially disrupting ecosystems and biodiversity. Additionally, extended warmth can lengthen the active periods of pests and invasive species.

Climate experts warn that without significant reduction in heat-trapping emissions, summers could continue to stretch even longer in future decades, affecting ecosystems and human health.

As summers continue to extend, the United States faces a pressing need to adapt to these changes to mitigate their impact on health, economy, and the environment.