In an earlier post I noted that the use of average temperatures
could actually hide indications of climate change. Inaccurate
temperatures would further reduce the accuracy of any analysis.
the use of high and low temperatues instead of hourly
temperatures creates a potential bias if temperatures are
checked at times other than midnight for reporting periods that
end at midnight. Procedures exist for minimizing this problem,
but they cannot prevent the possiblity that would reduce
accuracy. Although highs and lows usually occur at times other
than midnight that is not always the case. For example,
especially in the United States, the passage of a strong cold
front through an area not long after midnight may result in the
high temperature for the day occurring just after midnight
instead of the normal time in the afternoon. Or the cold front
could pass through just before midnight resulting in the
previous day’s low occurring just before midnight. In such
situations highs or lows may not be representative of t