weather · the model over the view
Wet-bulb temperature
Wet-bulb temperature 2 m above the ground as a field: the coolest a wet, sweating body can get in this air, so heat and humidity read as one number of danger.
Wet-bulb temperature is a Pro layer. Open it in the app to see what is behind it.
Open in the app Pro · 9 USDWhat it shows
Wet-bulb temperature 2 m above the ground as a field: the coolest a wet, sweating body can get in this air, so heat and humidity read as one number of danger. Over 26 °C heavy outdoor work is unsafe, over 28 °C it is dangerous for anyone not acclimatised, over 31 °C most people cannot keep cool even at rest, and 35 °C is the limit of survival in the shade. The readout also gives the air temperature and relative humidity.
Where the data comes from
Computed in your browser from the NOAA GFS 0.25° global model (public domain) temperature and relative humidity at 2 m, baked on our server every hour from 24 h ago to 48 h ahead in 3-hour steps, with Stull's 2011 formula (accurate to about 0.3 °C).
Reading the map
Grey-blue under 0 °C, green around 10 °C, yellow from 22 °C, orange at 26 °C (heat stress), red at 28 °C (dangerous), magenta at 31 °C (extreme), deep purple at 35 °C (beyond survivable).
Units Degrees Celsius or Fahrenheit; air temperature in the same unit, relative humidity in percent.
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