A grain bin capacitive moisture sensor system comprising: a data collector of a grain bin, comprising a data collector microprocessor and a data collector memory; a capacitive moisture cable configured to be located within the grain bin and being in communication with the data collector; a plurality of capacitive sensor nodes spaced at a predetermined interval along the capacitive moisture cable, each sensor node being wired in parallel to the data collector and comprising a sensor node microprocessor, a sensor node memory, a temperature sensor in communication with the sensor node microprocessor, a reference capacitive sensor and a capacitive moisture sensor, a main controller comprising a main controller microprocessor and a main controller memory, the main controller being in communication with the data collector, the main controller memory includes a data structure comprising grain type data, temperature data, raw reference capacitance data, raw moisture capacitance data, node identification data, physical node positional data, and a calculated moisture content for each sensor node; wherein each sensor node includes a circuit board having primary length L and width dimensions defining a circuit board plane BP, and a pair of capacitive plates (46, 48) extended along opposing sides defining the length L of the circuit board, the circuit board being positioned between the pair of capacitive plates (46, 48) with the plates positioned generally perpendicular to the circuit board plane BP; wherein each sensor node further comprises a wiring cable positioned between the capacitive plates (46, 48) and including a first pair of conductors (38,40) defining a conductor plane CP parallel to the circuit board plane BP, wherein the capacitive plates (46, 48) have longitudinal sides inclined toward each other outside a pair of planes extending along the inside edge of adjacent main conductors (38, 40), and wherein the circuit board, the capacitive plates (46, 48), and a corresponding portion of wiring cable are all enclosed within a two-part housing providing a sealed inner space and define each sensor node. a data collector of a grain bin, comprising a data collector microprocessor and a data collector memory; a capacitive moisture cable configured to be located within the grain bin and being in communication with the data collector; a plurality of capacitive sensor nodes spaced at a predetermined interval along the capacitive moisture cable, each sensor node being wired in parallel to the data collector and comprising a sensor node microprocessor, a sensor node memory, a temperature sensor in communication with the sensor node microprocessor, a reference capacitive sensor and a capacitive moisture sensor, a main controller comprising a main controller microprocessor and a main controller memory, the main controller being in communication with the data collector, the main controller memory includes a data structure comprising grain type data, temperature data, raw reference capacitance data, raw moisture capacitance data, node identification data, physical node positional data, and a calculated moisture content for each sensor node; wherein each sensor node includes a circuit board having primary length L and width dimensions defining a circuit board plane BP, and a pair of capacitive plates (46, 48) extended along opposing sides defining the length L of the circuit board, the circuit board being positioned between the pair of capacitive plates (46, 48) with the plates positioned generally perpendicular to the circuit board plane BP; wherein each sensor node further comprises a wiring cable positioned between the capacitive plates (46, 48) and including a first pair of conductors (38,40) defining a conductor plane CP parallel to the circuit board plane BP, wherein the capacitive plates (46, 48) have longitudinal sides inclined toward each other outside a pair of planes extending along the inside edge of adjacent main conductors (38, 40), and wherein the circuit board, the capacitive plates (46, 48), and a corresponding portion of wiring cable are all enclosed within a two-part housing providing a sealed inner space and define each sensor node.