Storage temperatures, the bane of everyone’s lives, but we don’t make it easy for ourselves. I am sure somebody can explain the rational behind a 25⁰C norm for room temperatures in the pharmaceutical industry but what actual relevance does this have to the real world. It is generally accepted that comfortable room temperature is around 21 to 22⁰C, so with a small margin of error 25 sounds about right as an upper limit of comfort. The problem of course it that this is for humans and for areas where we work and can exert some control over the temperatures, the reality though is that for pharmaceuticals we are not constrained by what feels comfortable. Yes medicines can spend considerable periods of time sharing space and therefore conditions with humans, however they also spend large amounts of time in locations where there are not the same constraints or easy controls, such as warehouses, in vehicles during transit or even in handbags, coat pockets or bathroom cabinets.
A quick search through weather data shows that pretty much every country or city on a longitude south of Nice, experiences average maximum temperatures over 25⁰C for at least two month per year. For somewhere like Lagos in Nigeria the average daily temperature does not fall below 25⁰C at any point in the year with the yearly average being 27⁰C!