Summer Simmer Index

The Summer Simmer Index calculator computes the Summer Simmer Index based on the air temperature and relative humidity.

INSTRUCTIONS: Choose units and enter the following:

• (t) Air Temperature
• (RH) Relative Humidity

Summer Simmer Index (SSI): The calculator returns the index in degrees Fahrenheit and Celsius.

The Math / Science

The formula for the Summer Simmer Index is:

     SSI = 1.98(T_f - (0.55 - 0.0055(RH))(T_f-58)) - 56.83 

where:

• SSI is the Summer Simmer Index  in degrees Fahrenheit
• T_f is the temperature in degrees Fahrenheit
• RH is the relative humidity expressed as an integer.

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