National Physical Laboratory

  • Science + Technology
  • Commercial Services
  • Educate + Explore
  • NMS Learning Zone
  • Measurement Network

On-line barograph

Atmospheric pressure in Teddington: 1007.0 hPa
Sea-level equivalent: 1008.0 hPa
Three hour trend: +0.8 hPa
Time of measurement - made every 5 minutes (see note about UTC below): 03:35 UTC
Date: 2018/Jan/19

There is no need to tap the screen.....

The graphs below show the pressure in Teddington for the past 24 hours and 7 days.

The barometric pressure data is derived from an on-line electronic pressure transducer. The measurement uncertainty of this on-line transducer is approximately 0.3 hPa. The unit hectopascal (hPa) is numerically identical to the millibar (mbar) Link to pressure units.

The pressure values shown are those at the point of measurement, that is approximately 10 metres above mean sea level. If a hole were dug to sea level, the pressure at the bottom would be about 1 hPa greater than at the top. Note that, when estimating a pressure value from the graphs, the uncertainty will be considerably higher than that of the measuring transducer because of limitations in screen resolution.

When using the pressure values, particularly for checking another barometer, it is important to appreciate that the differences in altitude, distance from Teddington and weather conditions may seriously limit the validity of the comparison.

Proper calibration of barometers can only be accomplished by direct pneumatic connection to an appropriate pressure standard and adherence to well defined procedures.

For the latest weather forecast, see the Met Office

Historical Barometric Pressure Data

Access to historical data is currently unavailable.