Dear Abukar Osoble Barqadle.
Normally temperature for sterile storage is (18 Celsius). Humidity in Guideline disinfection and sterilization on healthcare facilities of CDC and in MDD 93/42 and ISO 13485 write “not high”. So what is it mean “not high”? Normal humidity for human is 60-80%. For sterile item I was find correct information about it only in Standarts and Practice of IDS (Great Britain) in 2011. Temperature should be controlled within a range of 18-220C, Humidity should be within the range of 35-60% RH.
Relative humidity – the ratio of the partial pressure of water vapor in the gas (primarily in the air) to the equilibrium pressure of saturated vapor at a given temperature. Denoted by the Greek letter φ, measured by a hygrometer.(Wikipedia)
So you can measure humidity by hygrometer.
About your question I think that we should measure humidity in delivery container (in case if you use container closed type (with rubber seal)). In that case, I think, temperature and humidity outside (in truck) is does not matter. However in hot country like OAE temperature and humidity can change several times in the day.
In every case packaging of sterile items do not like wet and humidity because microorganisms can pass packaging materials in changing of permeability.
Hope its help
Petr Demidov, Moscow, Russia, email@example.com