The supply of meteorological information for Comet operations began long before the first prototype was in the air, since information on aerodrome temperature and pressure and ambient air temperature up to 40,000 ft. was required to assess engine performance. Thus it was found that extremes of temperature at 40,000 ft. range from about – 80 °C. over the United Kingdom to – 35°C. over Northwest India and performance curves were constructed to cover this range.

Statistics on low temperatures were required in connection with the performance of the de-icing system on descent; statistics on high temperatures were required for engine performance throughout flight.