Graeme Smith wrote:
Hi,

If I take 5 minute readings from a barometer what is the preferred/usual
method for calculating the rate of change over an hour.

Thanks,

Graeme

It would be very unsound to extrapolate a 5-minute change to
one hour because the barometer may only change by 0.1 or 0.2 mb in that
time. Can you read it that accurately, and is it that accurate anyway?
The only proper way to do it is to measure the pressure at the
beginning and end of the hour in question.

Tudor Hughes, Warlingham, Surrey.