Shaw Meter Dew Point Calculator

Expert Guide to Shaw Meter Dew Point Calculation

Introduction & Importance

The Shaw meter dew point is a crucial measurement in meteorology, representing the temperature to which a given parcel of air must be cooled, at constant barometric pressure, for water vapor to condense into water. Understanding and calculating dew point is vital for weather forecasting, agriculture, and many other fields.

How to Use This Calculator

1. Enter the temperature in degrees Celsius.
2. Enter the relative humidity as a percentage.
3. Click ‘Calculate’.

Formula & Methodology

The formula for calculating dew point (T_d) from temperature (T) and relative humidity (RH) is:

T_d = (T – 14.55) + (243.5 * (log(RH/100) + 5)) / (17.27 – log(RH/100))

Real-World Examples

Temperature (°C)	Humidity (%)	Dew Point (°C)
25	60	13.5
10	85	5.4
30	40	17.2

Data & Statistics

Location	Average Temperature (°C)	Average Humidity (%)	Average Dew Point (°C)
London	11.5	82	7.6
New York	13.2	63	8.2

Expert Tips

• Dew point is a better indicator of atmospheric moisture than relative humidity alone.
• High dew points can lead to discomfort and increased risk of thunderstorms.

Interactive FAQ

What is the difference between dew point and relative humidity?

Relative humidity is the ratio of the current partial pressure of water vapor to the saturated vapor pressure of water at a given temperature. Dew point, on the other hand, is the temperature to which a given parcel of air must be cooled, at constant barometric pressure, for water vapor to condense into water.

For more detailed information, see the NOAA’s climate data and the METED’s guide on dew point.