Correlation Analysis and Graphing

I have several datasets (weather eg. rain (mm), wind, sunshine,) which have been measured alongside other variables such as soil moisture (at two depths), soil temperature (at 4 depths), & pasture growth rates (weekly).

I want to be able to understand which variables influence pasture growth, soil moisture, and soil temperature content the most.

example (weather dataset) is attached along with the processing required to complete the task in a word document