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San Juan in Puerto Rico?
San Juan has a tropical climate that can get very humid in the summer, with an average high of 87 degrees in July. It doesn't cool down much in the winter in this Caribbean island city. January's average low temperature is a pleasant 71 degrees.
Hawaii is about as consistent as it gets. It never gets hotter than 89 degrees or colder than 65 degrees Fahrenheit (although contrary to popular belief, it does in fact snow in Hawaii).
Deep tropics in small landmass. E.g. KL (Eurasia is one big landmass but KL is located in a thin peninsula so it can be considered as a small landmass), Jakarta, Singapore.
They have multiple factors that ensure a high degree of moderation. Low latitude will mean that max sun angle is consistently high (>60 degrees). Small landmass mean that there is no place for extreme cold or extreme heat to flow.
In mid-latitudes, places isolated from the coast experience drastic changes in temperature due to the small heat capacity of land. But in the tropics, even places far from the coast have similar standard deviations from the coast. This is due to the high cloud cover and humidity. During the day, the cloud shields the ground from the intense sunlight, therefore keeping the high from going extreme. In night, the cloud prevents heat from escaping as it absorbs infrared (source of heat) and reradiates it back to the ground. Water vapour work the same way as clouds.
The ocean works as an extra source of moderation. That is why those on the coast are even more consistent. Singapore's record high is only 36C, despite an average of 32C.
For a nontropical place, the Atacama desert has the most consistent temperatures closest to room temperature with little standard deviation. AC is required for comfortable living in places like Singapore. Not so for these locations:
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