So, the tempest weatherflow is indeed solar-powered, for the outdoor part of the unit. It transmits wirelessly to the indoor ac-powered unit, and from there, you decide where the data is going. I use a simple pc with WeatherDisplay software to send it to various internet weather sites, who store the data long-term for me, and, WD also updates a local db for me.
While the outside data-collecting unit is solar-powered, and can be placed advantageously for your camp, the inside hub piece and the pc piece would need a black box that you build to house it and power it for a year. This doesn't seem hard to me, and it could be expandable into other services for your camp (can also provide power to other needs).
Ultimately, the black box consists of what you are willing to stick into it ... the pc piece can be a "windows mini pc", of low power draw. the tempest "hub" piece is wifi. a mini-wifi (usb stick) will go into the windows mini pc. All of this sits in a thermal/weatherproof box of your choice, powered by a mini-inverter, battery-bank, panel(s) that you whip up, like a diy solar generator.
My little pc runs for weeks at a time, if I don't use it for something else ... I'd bet it could go to months, years, especially if you stuck a "watchdog" function of some kind into the black box. If not running, get it running.
Still seems possible to me ...