Data Snapshots

Maps
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Total Monthly Precipitation
How much rain and snow fell during the month?  

Colors show monthly precipitation totals for each of the 344 climate divisions in the contiguous United States. The darker the color, the higher the total precipitation.

Where do these measurements come from?  

Daily measurements of rain and snow come from weather stations in the Global Historical Climatology Network. For each station, climate scientists check the data quality, calculate the monthly total, and plot it on a gridded map. To fill the grid, a c...

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