In one embodiment, an enclosure for electronic circuit boards and components is disclosed. The enclosure has a closable, weather-resistant housing that is sized and shaped to receive mounted circuitry in an enclosed space that is defined by a back wall and side walls extending outwardly from the back wall. The housing includes a detachable cover for covering and sealing the enclosed space. In one embodiment, the circuitry includes a planar electronic circuit board that is mounted within the enclosed space. The planar electronic circuit board has a subsection of power supply circuitry that is operative to receive electrical power from outside of the enclosure. The circuitry further includes power supply transformers and capacitors that operate from power received from outside the housing, and data processing and communications components that include a data processor and a data bus. The data bus is coupled to electronic circuit connectors. The enclosure is configured such that the electronic circuit board is exposed to an external environment when the cover is detached.