Wet Bulb Global Temperatures Resources
Why are Wet Bulb Global Temperatures important?
The ThreeH Thermohygrometer has a WB (Wet Bulb display). This low-cost unit is perfect for portability, for field use.
Heat stress and human safety
Body's cooling mechanism: The body cools itself by sweating & evaporating that sweat. The wet bulb temperature is the key factor in how effective this process is.
☆ Dangerous conditions: When the wet bulb temperature gets too high, around 35°C or 95° F, it can be fatal because the body can no longer cool itself through sweating, even in the shade.
☆ Vulnerable populations: The elderly, young children, outdoor workers, homeless, and people with underlying health conditions are particularly at risk from high wet bulb temperatures.
☆You Can Assess Your Risk with simple Low-Cost Tools
Wet Bulb Temperature tools for everyday use, for everyone. For under £30, a small battery-powered digital thermometer/datalogger with Bluetooth and a smartphone app can provide relative humidity in % & temperature in Degrees Celsius or Fahrenheit. The app can provide graphical output.
YouTube short
Download, colour print & laminate wet bulb tables for later use. Keep them with your thermometer.
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Self-rescue from heat exhaustion can be difficult due to confusion and brain fog being early symptoms of heat exhaustion.
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Link to British Red Cross.
How to stay cool during Wet Bulb Events:
Try to get into shade if you are outside, without excess exertion.
All movement generates heat, which you can't shed, so it makes you hotter.
Try to get into an air-conditioned building if you are in a city.
Sit in a paddling pool in the shade in your garden.
Drink ice cold drinks. Stay indoors and create air movement with a fan.
Sitting in the shade with your feet in a bucket of cold water.
Prioritise staying hydrated with water and electrolytes
Take cool showers or use cold compresses.
Wear loose, light-colored, breathable clothing.
Avoid strenuous outdoor activities.
Encourage children to get into the paddling pool too.
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Did you know the MOD uses Wet Bulb Tables for the safety of staff on exercises and physical training?
Heat Illness Prevention - MOD May 2025
Commanders' Guide to Heat Illness Prevention May 2025
"Where it is assessed, there may be an elevated risk of heat illness; commanders are to ensure that Wet Bulb Globe Temperature (WBGT) monitors are readily available wherever possible and used correctly to inform the proactive and dynamic application of risk management procedures. WBGT readings alone should not be used as the only indicator of risk or as a go/no-go. They should be used as a tool to inform a commander’s own risk assessment. WBGT readings may rise quickly which could lead to a given activity continuing when it is no longer safe to do so. Therefore consideration should be given to checking WBGT periodically throughout an activity."
"Failure to learn lessons following the 2013 death of 3 soldiers whilst on a training exercise in the Brecon Beacons.."
"The mandatory requirement to take Wet Bulb Globe Temperature (WBGT) readings, in accordance with JSP539 (where there is an elevated risk of heat illness) before physical testing and loaded march training has now been included in policy, as it requires informing a risk assessment.
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Further Information from the UK MET Office.
Author: Press Office
27 June 2025
Author: Press Office
7 August 2025
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Help me reach people who aren't online and more people through outreach work:
Education & Outreach
There is a lack of education in the UK for us ordinary people about wet bulb temperatures and severe heat. Military commanders have to work to strict heat /humidity guidelines for soldiers doing physical tasks.
Employers don't really understand when it's too hot to work.
Publishing a wetbulb information booklet, wet bulb charts, information posters and other educational materials about safety in severe heat/humidity weather events.
Outreach talks to community groups, schools, colleges, businesses, local authorities, nursing homes and the public through public outreach stalls on the streets
Providing WBGT Thermohygrometers.
Put me in touch with potential sponsors for the project
Links to other Commentary and Analysis of XReadiness
I have written a fair amount about this Extinction Rebellion civilisation collapse survival research project on my Collapse Adaptation blog and I have just published an early draft on my other blog about Deep Natur3 Cinnection.
Wet Bulb Glob Temperatures education is also missing from the XReadiness survival pamphlet. In this YouTube video I explain why Wet Bulb Temperatures are important for survival.
Survival skills are not a mechanistic approach to solving the hunger problem, with some basic skills you learn off YouTube when you need them, and carry backpack full of dry kindling because you don't have the skill or knowledge to know where to find it when everything is soaked.
The thing is, in a changing climate, your survival skills need to be current and practised. Cotton wool is not a sustainable Tinder, but Tinder we make and collect to process from nature are.
There's an opportunity to really get this right. Through learning the skills, knowledge, and problems associated with foraging during an ecological emergency when food runs short.
Fire, shelter, water/ food foraging, can offer amazing opportunities to learn survival skills that connect us to nature at a very deep level. Learning to make our own tinder as well as learning a variety of other interconnected skills now, means that by the time you need them, you could be an expert.
Fire making and skills initiations to be more sustainable we need to be more connected to nature. Connection to nature is strengthened by learning survival skills in nature co-operatively & prosocially.
XReadiness is a deeply flawed and potentially lethal document. By lacking shelter and sleeping kit, it assumes expert level skills or aims to kill you.
If today was "Go" day..
Author: Rumi Mohideen.
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