The Earth Resources Observation and Science (EROS) research center in Sioux Falls, SD offers an opportunity to compare measurements from many observational networks in one location. This site hosts stations belonging to the US Climate Reference Network (USCRN), COOP Network, Automated Weather Station (AWS) Network, Soil Climate Analysis Network (SCAN), Surface Radiation (SURFRAD) Network, and Canadian Reference Climate Station (RCS) Network. Apart from near-surface temperature, initial findings indicate a higher degree of variation than expected among the measurements taken by the networks of precipitation, and soil moisture. These differences were particularly pronounced and could not be explained by microclimates alone. Precipitation tended to be sensitive to station infrastructure (existence and type of precipitation shield, heated gauges, and wetness sensors), observational redundancy, and QA algorithm. Soil moisture, on the other hand, tended to be influenced by observational techniques (approaches to sampling, and conversion from raw measurement units to soil moisture units), sensor installation, observational redundancy, and QA methods to detect faulty sensors. These subtle differences between network architectures can lead to heterogeneities in data quality across the suite of networks, which is very important to recognize as data from more observational networks become more easily accessible. Moreover, it is suggested here that potential users have a strong understanding of possible weakness and biases of the networks from which their data originated.