Thread: High and Low variances
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Old November 3rd 03, 11:08 PM posted to sci.geo.meteorology,sci.environment,alt.global-warming,alt.talk.weather
Roger Coppock Roger Coppock is offline
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Default High and Low variances


Icebound wrote:

Roger Coppock wrote:
While I was examining another question, I happened to notice a
large difference between the variances of the daily high and
daily low series. The day to day variance of the daily high
series is much greater than the day to day variance of the
daily low series.

Why are daily lows steadier that daily highs? I am sure
someone has seen this before, it is way too obvious to overlook.
Does anyone have any references?



1. In cloudy conditions, the temperature does not change much anyway.
2. In clear conditions, the overnight low temperature is governed (to
some extent) by the moisture in the air, and the moisture is also slow
to change. Overnight lows in clear conditions tend to fall to somewhere
near the dewpoint.

Thanks, Icebound!


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