What does hr stand for when measuring wind?

Answer 1

A complete measurement of wind includes its direction and speed.

The speed may be expressed in units of kilometers per hour, miles

per hour or knots.

When either of the first two choices is used and abbreviated,

"hr" stands for "hour".

Answer 2

HR stands for "highest reported." It is the highest wind speed reported during a specific time period, typically measured in knots or miles per hour. It provides information on the maximum strength of the wind during a particular event or period.