What is the best time of year to travel to Thailand and Cambodia?

We are planning a 10 day vacation to Thailand/Cambodia. Our two options are July - Aug period or the December timeframe. The primary focus of the trip will be to do fieldwork on temples and architecture, but we would also like to do some vacationing in Phuket in the process. Any advice on travelling to Thailand and Cambodia would be appreciated.

I have to disagree with the other answers. I go to Thailand 2 -3 times a year and if you are interested in temples and architecture and not battle growds of tourists - go in the summer. Just deal with the heat (you get used to it) and enjoy having the most wonderful temples almost to yourself! I was in Siem Reap last year in July and frequently was the only person visiting some of the Anghor sites - it was magical and otherworldly. And vacationing in the islands is cheaper and not as crowded - high season is just not fun if you want to really have some time in the field. Enjoy your trip - it is a lovely region.

Hi Welcome to Travel in Thailand http://treelives.blogspot.com/

We have Travel Guide with Packet Around Asia and Now We have Special Promotion about Air Ticket Hotel and Many Agent for you Change

(( With Beautiful Picture for Guide Line )) http://answers.yahoo.com/question/accuse_write?qid=1006012608314&kid=OadxAWXiDVn3Uyzdt0VE&s=comm&date=2008-06-23+01%3A59%3A04&.crumb=

i agree, i was in thailand in november during their "cool" season, it was still about 90 degrees but it did not rain once and perfect weather for the beach!

November to February is the best time to visit the Thailand. The weather is typically mild and pleasant then. It's usually hot from March to May, and then rainy from June through October.