Would the typical routes be the same (CDG) every night or is there a bit of variety thrown in.....such as weeks away at other outstations?
TLS-CDG-TLS is operated by Swiftair with their Emb 120 aircraft. They fly the same route 4 weeks a month, all the year, same captain and same FO
Méteo France have an ATR42 based at TLS, maybe you can give a try.