The next logical step for using sensors, in this case LM35 and DS18B20 temperature sensors, is to shield them somehow from elements. I am not very comfortable installing a bare sensor outside, into the rain for example.
Some kind of small metal pipe should bee good enough. I did find some electric cable connectors for a thick power cable in local hardware store.
I used some plasticine like stuff, which hardens in about an hour and is intended for emergency car repairs, to plug one end of that tube.
End result can be seen on picture. Sensor is a bit slower reacting to temperature changes, but the difference is not something to worry about.
