Visualising the world by apparent temperature at a given time of the year [closed]

My overseas trips tend to be in the middle of the year (roughly some time between June and September), as Australian workplaces tend to have a Christmas shutdown straddling Christmas and the new year.

However, I want to avoid going to excessively hot destinations during the northern hemisphere summer. For example, Vietnam isn't all that suitable because of either temperature or rain for all three of its regions. I want to go to locations reasonably close to Australia, and I've already been to Japan, South Korea and Taiwan, with many of the Asian alternatives being closer to the equator.

How can I visualise the average apparent temperature at a specified time of year, so that I can compare locations and see the effect of changing the time of travel?

I'm predominantly interested in the Asian region.

Related questions: Is there a map showing historical average precipitation at a specific time of year? and Is there a website with historical temperatures and weather data?