Good points. I bought a WeatherFlow Ag Bluetooth weather monitor last year for collecting weather conditions when I start and finish a spray job. My intention was to make a bracket to mount it on my boom and take a reading from the cab at the start and finish. Only problem with that is it turns off after a little while and you have to press the button to turn it back on. I would still recommend one though, it has an app that stores the readings so you can reference them later when filling out paper records. It would be ideal if this app could interact with a weather monitoring device such as this if one was available. The technology is available, someone just needs to figure out the mechanics of getting them to communicate 

Edit: added link to weather monitor


WeatherFlow monitor