Tuesday, October 13, 2015

Global cooling

Satellite temperatures: January ends an 18-month above-normal run.

Global cooling


Ever so slightly, January finished just below long-term averages in the satellite data, according to the monthly temperature report released this afternoon.

The global temperature was a mere 0.02 Fahrenheit below the 30-year January average, but of significance is that it ended a run of 18 consecutive months of above-normal readings, according to the University of Alabama's John Christy, keeper of the data for NASA.

It also was only the second month in the last 2 1/2 years in which temperatures finished below normal.

The big factor, says Christy, is the obvious one -- the La Nina cooling event in the equatorial Pacific.

This is one of the strongest ever, and it covers an area of millions of square miles.

The cooling supplanted last year's impressive El Nino, which helped drive the 2010 temperature to record heights.


Inquirer Weather Columnist
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About this blog

Everyone talks about the weather, and here we write about it.

When we’re around and conditions warrant, we’ll keep you updated about what’s coming, but we will do our best always to discuss weather and climate developments in context and remind you that nothing in the atmosphere happens in a vacuum.

Tony Wood has been writing about the atmosphere for The Inquirer for 26 years.

Reach Tony at twood@phillynews.com.

Tony Wood Inquirer Weather Columnist
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