[Humphrey]

Best time of year is subjective!! All Lonely Planet guide books solve this problems by explaining what each place is like at each time.

Eg, for Yosemite, it describes how during summer it is rediculosy busy & hot, so you might prefer to go during the shoulder months, but then you risk having some of the park closed for snow. So, "best weather is subjective".

Likewise, there are many locations, such as Thailand, where the best time to travel is winter. It's too hot in the summer!!

[stephenr]

> there are many locations, such as Thailand, where the best time to travel is winter.

"Winter". Haha. Terminology aside, you're right of course. I was surprised that this actually showed the 'correct' time for most pleasant weather in Ayutthaya (Thailand) - Dec to Feb, the cold/dry season. (People here call it winter, but Thailand doesn't have four seasons so I hate using that term for it)

Weirdly, it suggested almost exactly the same time of year to visit Adelaide, South Australia, which is frankly ridiculous. It'll be hot and dry, and everything will be brown. Seriously.

If you must visit the 1970s. Sorry, I mean Adelaide.. go in Autumn (March - May).

[naiv]

Yes, we travel a lot and what is warm for you might be cold for me etc.

I have solved this problem analyzing more than 20 billion weather data points and created a nice search around it, so you can find the perfect spots that fit your needs depending on temperature, humidity etc. right now it's an internal page for my own use and one of my side projects that I never officially released but use frequently myself.

There seems to be demand so I will put it online in the next days. It will take the subjective out of the best time to go.