# Summer Simmer Index

Not Reviewed
SSI =
Tags:
Rating
ID
rklarsen.Summer Simmer Index
UUID
db06375a-1f01-11e6-9770-bc764e2038f2

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) This is the air temperature.
• (RH) This is the relative humidity.

Summer Simmer Index (SSI): The calculator returns the index in degrees Fahrenheit.  However, this can be automatically converted to compatible units via the pull-down menu.

#### The Math / Science

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

where:

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