For a month, no, that'd be fine.
I have however been reading various medical publications about solubility and preservation of N. They seem to draw this conclusion:
N, water, PEG - years at <4C
N alone - years
Apparently, the molecule is broken apart by hydrolysis, so any water solution is unstable unless combined with various things, like PEG or alcohol. Not a chemistry expert so someone else can explain why the drug breaks apart in that environment.
Something I learned in basic chemistry was that reactions generally speed up the higher the temperature, so whatever you're holding, best to keep it cool.