The temperature of water is a measure of how much heat energy the water contains. Temperature can be measured on many different scales. In the U.S. we usually use the Fahrenheit scale. On the Fahrenheit scale, water freezes at 32 degrees and boils at 212 degrees. Scientists usually use Centigrade (Celsius) scale. Water freezes at 0 degrees C and boils at 100 degrees C. 

     Converting Fahrenheit to Celsius = oC = (5/9) × (oF-32)

    Converting Celsius to Fahrenheit = oF = [(9/5) × oC] + 32


    Learn About: 

    Air Temperature

    Water Temperature

    The temperature of streams reflect the surrounding climate. Streams in warm climate generally stay warm throughout the year, while streams in colder climates tend to change throughout the year. The water in a stream is constantly mixing; hence, the temperature usually remains the same at all depths. However, in slow-moving waters, like deep pools, different temperatures at different depths are found. Riparian vegetation, snow melt, material on the stream bottom and banks, and industrial discharges all affect water temperature. 

    Visit our Temperature information page for more information on natural and human factors that influence temperature.

    When in the field, measure both air and water temperature. Click on the tabs above for instructions on how to measure them.


    Turn on the thermometer and make sure it is set in Celcius (°C). Measure the air temperature first by holding the thermometer in a shady location and let the thermometer adjust to the ambient conditions for at least 1 minute before recording. 
    Airtemp 1 Airtemp 2



    Measure the water temperature by submerging the thermometer two-thirds below the surface of the water. It is best to record the temperature of the stream in a central flowing location. Let the thermometer adjust to the water temperature for at least 1 minute before removing the thermometer from the water and quickly recording the temperature.


    Watertemp 1 Watertemp 2