Cold Weather Adjustments MET
Although for the Met exam you will be required use temperatures and ISAISA —International Standard Atmosphere deviations to convert indicated to true altitudes (and vice versa) in an actual aircraft on the approach you will not have time for this and so they keep it simple; if the temperature is too low (and therefore you are closer to the ground than your altimeter shows) then you apply a published cold weather increment to the published minima. Simply add this adjustment onto the minima, and fly to this new figure. The only mistake that can really be made is subtracting rather than adding.
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During an approach to Rekjavik at 14000 ft the approach plate gives a cold weather altitude adjustment of 30 to a published altitude of 450 feet on the approach. What decision altitude should you fly to in order to ensure appropriate terrain separation?