Hi Everyone,
I would appreciate if someone can help me with braking the following problem:
Task
- Create next twelve months revenue forecast prediction based on the existed statistical data
Existed data
- Revenue data for the last 36 months;
- Human heuristic prediction for the next twelve months based on info received from a client, previous experience, personal feelings, weather outside, coffee quality bought in a morning, wife's complains about working late and going fishing too often, mother-in-law's resent visit and god knows what else.
I tried to brake it on my own, but unsuccessfully.

Thank you very much!