With regards to the lack of decimal precision on temperature that is going to be a deeper issue.
The forecast call which is used now does all the unit conversions to the local (Fahrenheit vs Celsius for example, but unfortunately just returns whole numbers.
/observations/station/{station_id} however gives more detail but returns all the data in one standard unit. Celsius for temperature for example. It does however provide the stations expected units so we know if we need to convert and what to convert to.
But we would need to write some untility code to convert C to F as well as MB to to the various pressure units.
The observations call seems to be missing current conditions (sunny, cloudy, etc) so that would be an issue as well.
Probably best to contact Tempest and see if they can provide an all in one endpoint that gives us more what we want. They would probably be interested anyway since the forecast call returns a lot more data than we need.