Agricultural observations are retrieved from the Australian Bureau of
Meteorology (BOM) Weather Data Services Agriculture Bulletins,
http://www.bom.gov.au/catalogue/observations/about-agricultural.shtml
and
Australian Bureau of Meteorology (BOM)) Weather Data Services
Observation of Rainfall,
http://www.bom.gov.au/climate/how/observations/rain-measure.shtml
Station location and other metadata are sourced from the Australian Bureau of
Meteorology (BOM) webpage, Bureau of Meteorology Site Numbers:
http://www.bom.gov.au/climate/cdo/about/site-num.shtml