Due to multiple factors, expect to potentially pay more when booking in December. For low rates, May can be a great choice for travel to Cape Town International. Flights to Cape Town International from International Sunport in May are about R1 967 on average during May, but can be found for as low as R1 331.
When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Albuquerque is roughly similar to Cape Town. You can assume this to be the case over the next 7 days.
Expect the weather to be around 34 °C on average in July. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Cape Town is generally colder than in Albuquerque.