The European Pharmacopoeia defines room temperature as 15-25 °C, and most of the stock in a medicines warehouse sits in that band. An unheated store drops below it in winter and the space under the roof climbs above it in summer, while the single wall thermometer reads the most comfortable spot in the building.
| Warehouse spot | Typical behaviour |
|---|---|
| Under the roof, top shelves | Hottest in summer |
| Foot of an outside wall | Coldest in winter |
| In front of the dispatch door | Swings through the day |
| Middle of the warehouse | The most stable zone |
The EU GDP Guidelines (section 3.2.1) and the Turkish TİTCK GDP Guide (4.2.6) require temperature mapping before use, place the monitoring devices where fluctuation is greatest, and repeat the mapping after a risk assessment or a significant change to the facility.
Moving loading to the morning in summer, keeping product on the dock in the shade and setting alarms on both the upper and lower limit stop an excursion at its source. Moving the product elsewhere does not fix the spot, and the same excursion returns with the next shipment.