Wednesday, Jan. 17, 2007 | 7:01 a.m. The more sensitive among
you might have noticed something about the weather. No, not that
we're in a cold snap. We know that. And we've heard that
Sunday's high temperature was a record setter for being so low
on that date - reaching only 39 degrees at the day's warmest
point. No, that's not the news. The news is that, record-
breaking cold temperatures in Las Vegas notwithstanding, the
nation's average annual temperature is slowly increasing -
further evidence, some scientists say, of global warming. And
we're feeling that warming here. According to the National
Weather Service, last year was the third-warmest year on record
for average temperatures in Las Vegas. Our mix of hot and cold
could continue through summer, when federal scientists are
predicting scorching heat for the desert Southwest. That's an
option that might sound appealing to those shivering through
subfreezing nights and taking pictures of the frozen water
fountains. Nationally, a lingering wave of warm ai