Just for some housekeeping, this is a series of system graphs.
Soil system internal temperature, sampled every 15 minutes.
Weather station internal temperature, sampled every 15 minutes.
Weather station internal relative humidity, sampled every 15 minutes.
A graph showing by how much the weather station sample time drifts. Standard measurement interval has been set at 900 seconds but I have noticed that this interval is not always adhered to. Current clock drift is the difference between the times of the current and last most recent readings. Total clock drift is the difference between the time of the initial sample at the beginning of the sample window and the time of the current reading.