Based on the examples provided at wunderground-core, I created the class available here. Data includes temperature, wind speed, humidity, rain rate, etc., but unfortunately not solar radiation. I used this API to build a Java class that retrieves historical data over a year from a specific weather station. Martin Benning developed wunderground-core, a Java API for weather data handling from wunderground weather stations. In the following, I describe such a method. There is however no built-in functionality to retrieve historical data over long periods (e.g., a year), which means that you need to write a script, either using the API, or using another method. An API also exists for retrieving data from the service. Measurements from personal weather stations can also be uploaded to the website and be made available. Weather Underground ( wunderground) is a website that provides weather-related reports, forecasts, maps, etc.

This Java class automatically retrieves weather data from wunderground. Retrieving historical weather data from wunderground

Wunderground historical weather