I live in the french alps and for the rides around here, I'd give it a 3. That is, about an average ride. It works out to 20 meters per kilometer or 4% average gradient (assuming half the distance is climbing the other half descending, as there's not much flat on your route).

A hilly route over one or two cat 1 climbs is typically about 3000 meters climbing for 100 kilometers, i.e. 30 meters/kilometer or 6% average gradient.