After remaining north of Guyana for November and most of December the ITCZ appears to have moved rapidly south in late December and is now south of Georgetown.
On the image (courtesy of wsi.com) my best guess of its position is marked by red dots.
This month we have had many quite dry days but also days with short heavy showers or short periods of rain. The south of Guyana seems to be getting more rain than the north.
Note: I continue to make occasional comments on this topic since no-one else seems to be doing so - not that I claim any particular expertise. I guess my interest originates from working at the Met Office in the UK for a couple of years as a programmer.