Urban exposure can vary by street, shade, parking location and wait duration. A weather forecast alone does not show conditions in the vehicle load space or beside the product.
Place the logger at a point representative of the load on the trial route. Record each stop's time, location, shade, parking duration, door opening and delivery order on the same form.
Where practical, compare an alternative stop order with a similar product and load arrangement. Align logger time with the route app or delivery sheet, and note shaded and sun-exposed parking separately.
Review data by day, vehicle, packaging and route. Do not infer a citywide temperature difference or universal risk threshold from one day or location.
If you change stop order, waiting point or parking, measure again with the same layout and recording method. Take product requirements from the approved instructions for that product.