This image shows a heated 50-meter long blade. This is an infrared photo taken from the ground of an 80-meter tower. The heating is targeted to the leading edge of the blade, which you can see from the spot temperatures. The leading edge shows a temperature between 15.7°C and 21.2°C depending on the location. Due to the distance that the infrared photo was taken from, there may be +/-2°C of error.
This table shows the predicted temperatures and the measured temperatures. The ambient conditions where -2°C degrees Celsius with wind speed around 2.2m/s. The predicted blade surface temperature was between 14.5°C to 20.0°C.