Data Snapshots

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Difference from Average - Monthly
Was the month cooler or warmer than usual?  

Colors show where and by how much the average monthly temperature differed from the month’s average temperature from 1981-2010. Red areas were warmer than the 30-year average for the month and blue areas were cooler. White and very light areas had temperatures close to the long-term average.

Where do these measurements come from?  

Daily temperature readings come from ground-based weather stations in the Global Historical Climatology Network. Volunteer observers or automated instruments collect the highest and lowest temperature of the day at each station over the entire month,...

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About This Date: 
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