You may use any oil weight on the chart, because your local temperature is not extremely hot or cold. Be sure that you follow the ACEA spec.
From what I've seen, 5W20 weight will provide adequate lubrication and protection, and allow for better mileage. 5W-20 weight runs in most small cars, and even light duty trucks, across the USA.
You could try all of those motor oil weights, and report back with your progress. Chart everything. Give us as much raw data as possible.