Why Direct Broadcast satellite is interrupted by climatic conditions?
The difference is probably because of the different Radio Frequency Bands used by the different Satellite Services. 
Normally the higher the frequency is, the more is affected by the rain. On RF links rain fade start to occur at some GHz and it becomes very important if you go above 10GHz.
You can check the ITU-R model for the rain attenuation on this link: 
http://www.itu.int/rec/R-REC-P.838/en

Another thing that might make the difference is how fault tolerant the service is (they could have redundancy, diversity…).