Unlike in English, in Russian double negatives are absolutely OK. Moreover, in this case, "Там никогда идёт снег" grammatically incorrect and sounds funny for Russian native speakers.

yes, никогда always has to have a negative не after it, it doesnt work without it.

Никогда - это значит: ни при каких обстоятельствах. under no circumstances And there is a word «некогда». It is a completely different word.

Yeah, it negative form that is always use together in russian. This as twice negative никогда не. Word никогда is negative and the preposition не also is negative. for example: я никогда не говорила тебе. Я никогда не пью алкоголь. This just need learn by heart. Form "никогда...не" For example: Я никогда в жизни не буду этого делать!

Márcia, compare: что-нибудь ('something' (random), literally: what-ever[it]be) никуда ни ты ни я - neither you nor I with genitive: ни рубля - not a rouble, ни малейшего сомнения - not a slightest doubt This particle is close in meaning to English 'ever' sometimes. It may imply choice of many options (что-нибудь). It also has a semantics of negation in никуда etc. Никто is like - not a single person (of many). It does need не: Никто не знает = nobody knows Никто знает - Mr. Nobody knows. ... unless the verb is omitted. - У вас когда-либо бывает снег? - Нет, никогда. (никогда не бывает) - Я без тебя никуда!