Geoscience Reference
In-Depth Information
Annual precipitation (mm)
400
200
600
900 1200 1800 2400
Figure 10.19
Mean annual precipitation (mm) over North America determined on a 25km grid as a function of
location and elevation. Based on data from 8000 weather stations for 1951-1980. Values in the Arctic underestimate
the true totals by 30-50 percent due to problems in recording snowfall accurately with precipitation gauges.
Source: Thompson et al. (1999). Courtesy of the US Geological Survey.
