Posted by: senorwx | February 2, 2008

January Was Chilly

January was chilly around Mexico and long-time residents say it was cooler than normal here, too!  I’m glad to know that since we just escaped the really cool (read: cold) winters in the high desert at San Miguel de Allende.

How cold did it get?  Down to 50.4 F/10.2 C on the 16th, though the average temperature for the month was  65.4 F/18.6 C.  Cooler than normal according to reliable sources.  It was 82 F/28 C on the 3rd and 29th of the month … so I think we’re back on track for warmer days ahead.

If you are really into stats (unlike those sad ones yesterday when my Pats lost to the Giants in a very undistinguished game), remember there’s tons of numbers at the Weather Underground.  It’s all generated and uploaded there 24/7 by your very own San Pancho Weather Station.

You may have noticed some trace amounts of precipitation during the course of the month (I notice we already have some for February).  Truth is, it’s dew. Collecting in the tiny buckets that collect rain for the station.  Dave Thurlow, meteorologist at the Mount Washington Observatory in New Hampshire, says you should know that dew doesn’t come down from the sky.

Dave reports that in 1812, William Wells, an American born doctor working in London, found that the ground loses heat to space, allowing it to cool to the dew point, the point at which water vapor next to the ground condenses into dew or frost. So the dew wasn’t rising from underground or falling from the sky.  It simply appeared out of thin air!

So now it’s time for true confession here on the San Pancho Weather Blog.  Those “trace amounts” of “rain” during the month, which we know is dew, have been deleted from the monthly and annual totals in the database.  We’re looking for wet stuff that comes down from above and dew just won’t qualify, thanks to the observant Mr. Wells.

By the way, if you hadn’t heard about the Mount Washington Observatory before, check it out: http://www.mountwashington.org/  It’s one of the oldest weather stations in the States and sits atop New England’s highest peak.  A mere mountain, though, by Sierra standards!

Incidentally, the spanish word “sierra” comes from the Latin word “serra” and means “saw”!  As in table or hack.

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