Where are you traveling to?

If you are going to Slovenia be sure to visit this site first.
If you are going to Poland look here or there.
When your plans include a visit to Moscow, in Russia or try this site first, or maybe this, or perhaps this, if you are setting out from St. Petersburg.

Try these sites for further destinations:

Albania
Armenia
Azerbaijan
Belarus
Bosnia
Bulgaria
Croatia
Czech Republic , Prague
Estonia
Georgia
Hungary , Budapest
Kazakhstan
Kyrghyzstan
Latvia
Lithuania
Macedonia
Moldova
Mongolia
Romania
Slovakia
Slovenia
Tajikistan
Turkmenistan
Ukraine
Uzbekistan
Yugoslavia

and always check the weather report beforehand... http://europe.cnn.com/WEATHER/!

.