Confused over which statistical method.

#1
I've got a series of statistical tests I need to conduct for a masters project and I'm slightly confused over which is the best to use. I'll start off with my first one and hopefully someone will have the patience to help me with the others...

I have climate data over an approximate 12 month period (some variation) and I need to examine the relationship with geophagy (soil eating) by guereza across 4 different sites from camera trap data. As there are large gaps in the data (sometimes days or weeks at a time) I have summarised by month however this effectively reduces my sample size to 12-14. I need to determine not only if there is a correlation between the two but some level of predictability power, I'm not sure if a regression analysis would be suitable or I'm going to be limited to correlation tests i.e. Spearman?