Variability across all seasons at 150 and 220 GHz. Left: flux densities of sources across three seasons, portraying data from f150 in blue and f220 in red. All sources shown are variable and classified as synchrotron emitters. We observe a correlation between frequencies, indicating that changes in flux at f150 correspond to analogous changes at f220. Right: fractional variability for the entire sample from f150 and f220, encompassing all seasons. We highlight sources with a mean f220 flux exceeding 50 mJy in red. The Pearson correlation coefficient for these sources is r = 0.94, while for the entire sample r = 0.84. These findings suggest a significant correlation between frequency bands.