When I … to Riga, it was cold, a strong northern wind … and it … for a fortnight.
1.came, blew, was raining
2.had come, had been blowing, had rained
3.came, was blowing, had been raining
4.was coming, had blown, was raining
5.came, blew, rained
came, was blowing, had been raining
вариант под номером 3