code and begin time = selected race start time and date = random date from selected date +/- 15 days and year = random year from past 15 years (or even 5 years may work) That's always been a personal wish of mine. One of the stumbling blocks I see with live weather though is that you'd need to race in the rough timezone of the real location. An extreme example would be racing in the Sahara desert. If you live on the other side of the world and race at noon your time, you'd get very cold temperatures, which wouldn't make sense if you set the starting time for 14h00. With temperatures playing a big role in the dynamic mix, you might get unexpected results. Or typical afternoon monsoon conditions in Malaysia would happen in the simulated morning. A possible solution would be a 24h database so you can relive the past day depending on the session start time, but then it wouldn't be unpredictable anymore, would it ? What about the posibility to query an online weather service ? then just apply the params to rf2. I remember one of the precursor of this feature was Microsoft Flight Simulator. And taking into account the Q&A posted here that says ... Circuit builders will even be able to include latitude/longitude and date information into the track description for complete real-world accuracy. Then with lat/lon information on the track definition's file you already have everything you need to query an