Climate Change Indicators in the United States
Climate Change is Happening Now
EPA's indicators provide important evidence of what climate change looks like in the U.S.
Seasonal Changes and Climate
EPA’s report uses indicators to explore how seasonal patterns are changing throughout the United States.
The last spring frost is occurring earlier in many places, affecting when and how plants grow.
Heat Waves in U.S. Cities
Heat waves in most large U.S. cities are occurring more often and the average heat wave season is longer.
About EPA's Indicators
The Earth's climate is changing. Temperatures are rising, snow and rainfall patterns are shifting, and more extreme climate events – like heavy rainstorms and record high temperatures – are already happening. Many of these observed changes are linked to the rising levels of carbon dioxide and other greenhouse gases in our atmosphere, caused by human activities.
EPA partners with more than 50 data contributors from various government agencies, academic institutions, and other organizations to compile a key set of indicators related to the causes and effects of climate change. These indicators also provide important input to the National Climate Assessment and other efforts to understand and track the science and impacts of climate change. Explore the indicators below. Learn more about EPA's indicators.