Abstract: Systems and methods in accordance with embodiments of the invention implement integrated environmental sensors that can operate in rigorous environments. In one embodiment, an integrated environmental sensor includes: at least one sensor and a substrate; where: the at least one sensor is disposed on the substrate; the at least one sensor can detect at least two environmental properties including: the surrounding temperature; the surrounding pressure; the flow rate of surrounding fluids; and the surrounding composition; the at least one sensor is capable of detection in an environment that has: a temperature greater than 150° C.; a pressure greater than 100 bar; and/or an inclusion of one of liquid hydrocarbons, H2S, CO2, and sulfur species; and the substrate can withstand an environment characterized by at least one of: a temperature greater than 150° C.; a pressure greater than 100 bar; and/or an inclusion of one of liquid hydrocarbons, H2S, CO2, and sulfur species.