September has gone by fast!
Have a look at the solar radiation graph from data collected in Singapore for the month of September. There were two days during the month where the solar levels were much lower than average. This would suggest greater cloud cover.
Now, compare the solar radiation data with relative humidity or air temperature and notice how the cloud cover effects them. Overlay the relative humidity or air temperature onto the solar radiation graph using the plot tools provided in the exploratory. This will help with the analysis. Note how the relative humidity stays at a higher level throughout the day and how the air temperature remains lower.
See if you can extract any further information from this data.