Data Snapshots

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30-yr averages by month: Min temp
How cool does it usually get overnight during this month?  

Based on daily temperature readings from 1981-2010, colors on the map show the long-term average minimum temperature in each climate division for the month displayed. The map reveals the average of “overnight low” temperatures during the month over the previous three decades.

Where do these measurements come from?  

Temperatures for each month come from stations in the Global Historical Climatology Network. A combination of volunteer observers and automated instruments collected the lowest temperature at each station every day from 1981 to 2010, and sent them to...

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