SimpleWetBulb

Calculates the wet-bulb temperature, heat index, and dew point from a given temperature in degrees Celcius or degrees Fahrenheit and the relative humidity. The calculations are taken from the following authoritative sources:

1. Wet-bulb temperature: Stoll formula (2011, DOI:https://doi.org/10.1175/JAMC-D-11-0143.1)
2. Heat index: The National Oceanic and Atmospheric Administration of the US (https://www.wpc.ncep.noaa.gov/html/heatindex.shtml)
3. Dew point: Magnus formula [Sonntag90] (http://irtfweb.ifa.hawaii.edu/~tcs3/tcs3/Misc/Dewpoint_Calculation_Humidity_Sensor_E.pdf)

The output is color-coded according to the following ranges of wet-bulb temperature:

• white text: no risk (<=80ºF, <=26.66ºC)
• green text: low risk (<=85ºF, <=29.44ºC)
• yellow text: moderate risk (<=88ºF, <=31.11ºC)
• red text: high risk (<=90ºF, <=32.22ºC)
• black background, white text, bold: extreme risk (>90ºF, >32.22ºC)

These ranges are taken from the US National Weather Service:

Suggested Actions and Impact Prevention
WBGT(F)	Effects	Precautionary Actions
< 80
80-85	Working or exercising in direct sunlight will stress your body after 45 minutes.	Take at least 15 minutes of breaks each hour if working or exercising in direct sunlight
85-88	Working or exercising in direct sunlight will stress your body after 30 minutes.	Take at least 30 minutes of breaks each hour if working or exercising in direct sunlight
88-90	Working or exercising in direct sunlight will stress your body after 20 minutes.	Take at least 40 minutes of breaks each hour if working or exercising in direct sunlight
>90	Working or exercising in direct sunlight will stress your body after 15 minutes.	Take at least 45 minutes of breaks each hour if working or exercising in direct sunlight

To test the script, you can make a new virtualenv and then install simplewetbulb:

$ virtualenv venv
$ . venv/bin/activate
$ pip install --editable .

It should now be available:

$ simplewetbulb

or:

$ simplewetbulb --temp 30 --humid 30 --input ºC