Today, the major averages all gained about 1 . The Dow Jones Industrial average rose 168 points to 17,888. The nasdaq added 47 and the s p 500 was up 22 to close above the psychologically important 2100 level. Bob pisani has more on the sectors that tend to do well in the final month of the year. Reporter historically, december is the best month for the s p 500. In the last 25 years, the s p 500 has been up 80 of the time in december for an average gain of nearly 2 . Thats according to data from kin show. Whats less commonly known is the Sector Performance is uneven. According to ken show again, the best performing sector in december for the last 25 years has been industrials up 84 of the time for an average gain of almost 3 . Another surprise, utilities was the second biggest gainer. Oddly the sector that gets the biggest publicity in december, technology stocks, theyre only up about half the time. Why is that . The data doesnt tell us, but its possible investors are still unsure abou