Wind [and-やら] rain [and-やら] [cause-で], our walk [topic-は] ruined was.
~やら~やら is the listing pattern: 'with X and Y and so on (among other things).' It has a faint complaint nuance, conveying overload from too many troubles at once. 散歩 (walk) is the casualty here, and 我々の is formal 'our.'