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The "anomaly" here, the number being graphed, is the temp versus the 1980 average. So, in April 2018, the planet lower troposphere of the planet was considered to be 0.21 degrees C hotter than it was in 1980.
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For those following along at home, the May 2018 numbers are in; and the anomaly was +0.18, down 0.03 from April. That makes May 2018 the 10th hottest of the last 40 Mays.
Each month's anomaly change doesn't tell us much of anything about warming -- like being told one day's Dow Jones closing number and change amount doesn't tell us how our long-term investments are doing. It's just a single point of perspective.