Thailand had three seasons : summer,rainy and winter. Each seasons,it would be different.My favorite seasons is winter.
Thailand is generally hot and humid. But in winter it's cold and dry. However,the cold weather is just 3-4 weeks in late December to early January.
Food is no different from others seasons. But focusing in food to warm the body. Event is travel to the mountian for enjoy the beauty of nature. Which I very like to see a stunning views and feel the coldn weather.