How do we
measure the
weather?
Weather
 The
daily atmospheric conditions
 Includes temperature, pressure, wind
speed and direction, relative humidity,
and precipitation.
Temperature
 Thermometer:
Degrees Fahrenheit or
Degrees Celsius.
Pressure
A
barometer measures atmospheric
pressure in inches or millibars. Normal
pressure at sea level is about 30 inches or
1013 millibars of pressure.
Wind Speed
 Anemometer
Wind Direction
 Wind
Vane/Weather Vane. The pointer
shows the direction of the wind.
Relative Humidity




Psychrometer
Relative humidity is a measure of the amount
of water in the air compared with the amount
of water the air can hold at the temperature
it happens to be when you measure it.
For example, you measure 20 grams of water
vapor at room temperature. At room
temperature the air can hold 40 grams of
water vapor.
Relative humidity = 20 grams/40 grams = 0.5 *
100= 50% humidity.
Precipitation
 Rain
ice)
Gauge or Meter Stick (for snow and