China Post: Martha Stewart, the popular American lifestyle guru who visited Singapore recently, commented on the quot;cruelquot; heat. Singaporeans who feel their country has become hotter over the years are not wrong. According to figures from the National Environment Agency (NEA), the average temperature last year was 27.9 deg C, or about 1 deg C higher than the average temperature over the last 50 years. The NEA said last year that it was difficult to determine how much of the upward …