Aquarium Thermometer Holder
I made a cheap thermometer for the outside.
I used this fish thermometer:
http://www.banggood.com/Wholesale-Digital-Fish-Aquarium-Water-LCD-Terrarium-Thermometer-p-12339.html
added a spit and a Tesa Power strip small and voilà, there is a sensor hanging in the wind....
UPDATE 28/12/2014: Thermometerholder2_b to protect the sensor of sunlight