In standard Russian, the vowel я in the word январь must be reduced to /ɪ/. So, январь sounds [ɪnˈvarʲ]. Today in Forvo there are eight people pronouncing this word, and all of them do it as [jɪnˈvarʲ], without the vowel reduction. Considering that is borrowed from latin ianuarius and the sound /ɪ/ is preserved in most languages like English, French, Catalan, German, Italian, Romanian, maybe there is an exception for this word and the rule doesn't met in this case, or the eight people in Forvo are non standard speakers? How most Russian speakers pronounce it?
In standard Russian, the vowel я in the word январь must be reduced to /ɪ/. So, январь sounds [ɪnˈvarʲ]
It does not sound like that.
Word-initial and post-vocalic я, е, ю, ё, are subject to iotation (prepending the vowel with
[j]), so the Forvo pronunciations are correct.
The vowel reduction is still there: a stressed word initial я, as in яблоко, would have been