The chart below illustrates how to interpret your barometer's inches of mercury reading. This provides a reasonably accurate forecast for the next 12 to 24 hours.
Barometric Reading - Forecast
Over 30.20"
Rising or steady - Continued fair
Slowing falling - Fair
Rapidly falling - Cloudy, Warmer
29.80" to 30.20"
Rising or steady - Same as present
Slowing falling - Little change
Rapidly falling - Precipitation likely
Under 29.80"
Rising or steady - Clearing, cooler
Slowing falling - Precipitation
Rapid falling - Storm
