What is the effect of high pressure altitude on rate of climb and climb angle?

At high pressure altitudes, the atmospheric pressure and density decrease. This reduction in air density has a significant impact on aircraft performance, particularly during climbs. A lower density means there are fewer air molecules for the wings to generate lift and for the engines to produce thrust. Consequently, the rate of climb decreases because the aircraft is not able to gain altitude as effectively as it would at lower altitudes with denser air.

Moreover, the climb angle is influenced by the same factors. A decreased rate of climb along with reduced thrust capabilities leads to a shallower climb angle. This translates to the aircraft needing to trade altitude gain for increased horizontal distance covered during the climb.

Therefore, high pressure altitude results in both a decreased rate of climb and a decreased climb angle, confirming that the correct answer is the one indicating both factors decrease.