Climate scientists discuss what they know about global climate change today, and how they know it.

The Southern Oscillation Index tracks differences in air pressure between the eastern and western sides of the tropical Pacific.

Temperatures measured on land and at sea for more than a century show that Earth's globally averaged surface temperature is experiencing a long-term warming trend.

In the midst of the mega snowstorm bearing down on the East, NCEI's Deke Arndt looks longingly back at December's warmth in his latest Beyond the Data blog. 

This week, Beyond the Data looks at one of the more well-grounded “rules of thumb” for understanding climate change: cooler "things" are warming more quickly than warmer things.

For those who are still waiting for winter's first snow, Deke Arndt blogs about using historical climate data to ballpark when it might arrive. 

This week's bloggers use the historical record to generate 10,000 possible scenarios for the remainder of 2015. In 97% of them, 2015 sets a new record temperature.

In this activity students work with data to analyze local and global temperature anomaly data to look for warming trends. The activity focuses on the Great Lakes area.

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