NOAA has released the global analysis for May 2015. It reports that May was the hottest on record, beating the 2014 record by 0.08°C. NOAA has May higher than GISTemp, but that doesn't mean a whole lot. For one thing it's only one month. For another, GISTemp does change as it receives reports from around the world. Not all data comes in at the same time.
Here is a chart with both GISTemp and NOAA data. The chart includes 2015 year to date average, which might or might not drop as the year progresses.
|Data sources: NOAA and NASA GISS|
You'll notice that the Y axis is shifting higher. If it stays hot this year, any "hiatus" looks as if it will be nothing but a memory soon, with all the other
Here's the percentiles map from NOAA, for the period from March to May 2015. Most places are hot, with large areas showing the record warmest:
|March–May 2015 Blended Land & Sea Surface Temperature Anomalies in °C. Source: NOAA|
I've pointed to a cool spot in the Arctic, because Stefan Rahmstorf tweeted about it. He was referring to his recent paper in Nature Climate Change which is in the May issue. (It was first published online in March.) That paper was discussing the observed cold spot in the North Atlantic and the slowing of the Atlantic Meridional Overturning Circulation (AMOC). You can read more about that here.