This page describes some of the 50 Essential Climate Variables identified by the Global Climate Observing System (GCOS) for worldwide monitoring.

Observations of global temperature going back to 1880 reveal that our planet's temperature is rising. This animation shows maps of yearly temperature compared to the 1981-2010 average from the start of the historical record through 2014--the warmest year on record. Each year's map is synced with a graph showing the evolution of our planet's temperature as compared to the 20th-century average.

Blogger Tom Di Liberto explains the math behind some of the tests that seasonal forecasters use to check forecast skill, and then shows how skillful the past decade's winter forecasts have been.

Summary: This interactive site shows how the social and economic characteristics of the Great Lakes region are impacted by regionally specific changes in climate.

Earth's surface temperature in 2014 was the warmest on record. Five months set new records for warmth, and a sixth tied for record warmest.

Radar technology enables weather observers to track rain and snow storms in real time.

Comprehensive records describing 48 different types of severe events, from localized thunderstorms, tornadoes, and flash floods to regional events such as hurricanes, derechos, and winter storms.

Daily maps, charts, and animations show the extent of snow and ice over the contiguous United States, Alaska, or the whole Northern Hemisphere.

The Interactive Data Visualization tool gives users a way to explore the abundance of different gases at more than 200 sampling sites around the world.

Historical records of U.S. temperature and precipitation as graphs, giving you a way to see how they have changed over time.