... also, if you can see your temp/humidity sensor through the sides of your radiation shield then your sensor can also "see", or detect, reflected solar radiation from nearby surfaces absorbing and emitting heat and give you higher readings. An example; Mine was showing around a 4 degree higher reading than actual temp. due to the sensor exposed to a reflection off the ground nearby. By blocking that source of reflection the temps read more accurately. I made a radiation shield that used bowls deep enough to block reflected radiation from below and still allows air to flow.