Windy team,
I was just hoping to express the same wish. I am a farmer and premium subscriber with some fields as much as 25 miles from others and rainfall variability, even within a mile or two, can be very significant, particularly in high summer where we tend to get much of our rain from isolated thunderstorms that may dump an inch in one place and nothing a mile away. The NWS/NOAA has maps here: https://water.weather.gov/precip/ that I would guess are just based on radar observation rather than actual ground measurements.
The main other historical datapoint that would be useful to me would be observed humidity. This can help me to assess risk of fungal and other crop diseases and possibly allow me to skip fungicide applications in favorable conditions. I have no idea if there are useable data sources for this or even what the best way to represent such data would be....possibly where one could select daily minimum, maximum and mean measurements by day or the average of those measurements over a given time period (average the min, max and mean values over last 7 days, 14 days, 21 days, etc...) Might be a long shot but just thought I'd mention it as well.
I really love your software and it has truly changed my farming life. The ability to view and assess differing predictive models helps me operationally to assess weather risk and timing for crucial operations. The drought information that I've only fairly recently discovered, has also been extremely helpful in marketing my crop, as I can see conditions and 10 day forecasts for my southern hemisphere competitors in near real time, allowing me to better understand commodity markets swings with the weather data that is often driving them with every model refresh rather than relying on weekly updates from prognosticators as before. I applaud your efforts and constantly evangelize for you with my fellow farmers and neighbors. Thank you for all you do.