In order to make the wind tunnel perform wind, rain, and snow experiments in a climate laboratory, this paper designs a movable DC open wind tunnelDirect Current (DC) open wind tunnel with a temperature effectTemperature effect for a test section at 4 m from the back end of the tunnel exit. The CFD method is utilized to simulate the 3D flow field of the wind tunnel in the laboratory. The velocity fieldVelocity field and pressure fieldPressure field distribution of baseline temperature and low-temperature field at – 30 °C are calculated and analyzed. The differential pressure transmitter and auxiliary equipment are then employed to calibrate the characteristics of the wind tunnel flow field under the corresponding working conditions. The 3D numerical simulationNumerical simulation and experiment results indicate that the errors of maximum velocity, velocity stability, evenness, and pressure fluctuation range of specific parts of the simulated wind tunnel flow field are within 10%. The simulation results of the wind tunnel flow field, velocity fieldVelocity field, and pressure fieldPressure field are compatible with the experimental data under different temperature conditions. The low-temperature environment deteriorates the air quality of the wind tunnel and increases the pressure fluctuation. The performance indices of simulation and measurement of the wind tunnel meet the design requirements. This study will provide technical support for the quality optimization and performance improvement of the flow field in the DC open wind tunnelDirect Current (DC) open wind tunnel.