To date, nineteen nations have hit or matched record high temperatures this year, according to Jeff Master's Wunder Blog, making 2010 the only year to have so many national records. In contrast, no nation this year has hit a record cold temperature.
Over the past decade, which was the warmest on record, 75 nations have seen record highs, whereas 15 have seen record lows.
Nations hitting record highs this year are the Ascension Islands, the Solomon Islands, Finland, Belarus, Russia, Ukraine, Colombia, Zambia, Cyprus, Myanmar, Chad, Niger, Sudan, Qatar, Iraq, Saudi Arabia, Kuwait, Pakistan, and most recently Bolivia. If Palestine were nation, the year's total would be twenty, since it hit an all-time high of 51.4°C (124.5°F).
This year is looking to be among the warmest yet recorded since data keeping began in the lat 19th Century. While the first half of the year was unusually warm worldwide, an expected La Nina phenomenon has recently brought cooler-than-average temperatures to much of the Northern Hemisphere.
EDIT
http://news.mongabay.com/2010/1123-hance_record_highs.html