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[peter]

Unless WF have changed the algorithm since last summer (perfectly possible!), the maximum temperature correction they make is 1.5 deg F, so I don’t think the difference you are seeing is due to the algorithmic correction. It is probably more related to the different thermal properties of the two devices.

@WFstaff

On the ambient temperature correction…
The Tempest software adjusts the raw temperature reading to an ambient temperature simulating a fan aspirated environment. This correction is calculated using solar radiation and wind speed data. Stronger irradiance values and light or calm winds will yield a higher temperature correction up to a maximum of 1.5 degrees F .