Upgrade seems to have fixed my HIGH temp problems. Unit is indicating a bit cooler at night than the surrounding area WU's and WAAS stations, but tracking pretty close during the day.
Had a problem getting downloads from the console to my PC, a tip from customer service was right on. Fixed that problem. Really good experience with the CS folks. Thanks
I'm just accepting this because there is no likely fix aside from providing shade over the casing, which would then shut down solar power to the fan. I'm sure one could fabricate a shield around the case that left the solar panels exposed, but my time is more valuable than that effort's worth right now. Especially given that probably 75-80% of the year here it will present fairly accurate data.
An easy temporary, summer-only shield could be contrived from aluminum foil, perhaps wrapped around a wire frame that mounted underneath the unit on the support shaft/pole/post. It would come up around the 5-in-1's body, covering over but not touching (a 1/2" spacing) most of its sun-exposed surfaces except the solar panels. The bottom would be relatively open so air could vent through and out around the top and solar panel areas. Constructed for ease of installation, It could be removed in the early fall.
My suggestion to AccuRite/Chaney would be an idea similar to others' here. Perhaps a plastic shield on standoffs that carry it around the south-facing upper body perimeter, providing a half inch ventilation space. Or the same concept but with a shield, still on standoff posts, but consisting of plastic fins with their flat faces toward the sun. Of course the plastic would have to be bomb proof so it doesn't become brittle over time - thin plastic with minimal support can break too easily.
Its either that or engineer a new case with ventilation ports so case-absorbed heat can't build up and convect or radiate as aggressively to the sensor.