Observing details at the Otter
Valley Weather Station
Daily at 09:00 (GMT & BST)
Temperature:
Readings are taken manually from Met Office sheathed minimum and
maximum thermometers housed in a Stevenson Screen positioned
1.25 metres above grass. These are
then reset.
Humidity:
A
wet & dry bulb hygrometer gives humidity readings, these are
noted and relative humidity is calculated using a slide rule or
the humidity calculator.
Rainfall:
A
standard rain gauge is checked for rainfall during
the last 24 hours.
Pressure:
A pressure reading is taken from a digital barometer.
Grass temperature:
A
minimum overnight grass temperature is noted and the
thermometer reset.
Soil temperatures:
Readings are taken using soil thermometers at depth of 30 & 100
cm.
Daily at 22:00 pm (GMT & BST).
Sunshine:
A
reading is taken of the total sunshine for the day and the
display reset to zero. Also one minute interval data sets are
produced via an ADC-16 data logger which are uploaded to a
computer and total sunshine is calculated by using a
spreadsheet.
AWS:
Data from a Davis Automatic Weather Station (AWS) is uploaded to a
computer and incorporated into a spreadsheet along with the
manual recordings made at 09:00 & 22:00 on that day. The AWS
provides continuous 15 minute data sets for temperature,
rainfall, wind speed and direction, humidity, dewpoints and air
pressure.
Monthly
All
the weather monitoring data collected is then used to produce a
monthly report which is submitted to the Climate Observers Link
and also uploaded to this website.
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