Do not decide whether summer dry-ice use rises from a forecast or fixed percentage. Temperature around the package, direct sun, waiting, route duration and product load may all affect the result; use your own shipment measurements.
On the shipment form, record product and load quantity, starting dry-ice mass, remaining mass at delivery, packaging model, product temperature, vehicle environment and sun/wait events. Keep weather data separate from readings around the actual vehicle or package.
Compare summer and winter records for similar products, packages and routes. Note differences in route or load; where possible, test one controlled change such as shaded parking or shorter waiting. Any decision to increase dry ice must fit product acceptance conditions and authorised dangerous-goods instructions.
Before making summer packaging or quantities routine, run thermal validation for hot-route and delay conditions. If product readings approach or exceed its limit, the quality owner assesses them. Records describe your lane; they do not guarantee performance for other products or transport conditions.
