Climate Data Online offers temperature, rainfall and solar exposure values, per day, and per month for each station, for all years that a Station has been operating and measuring that variable. Data is from both closed and open stations. Data timespans vary across stations.
The earliest data is for Parramatta, commencing 1832.
Data values are typically incorporated into CDO within 24 hours of the value being recorded, but QC of the data can take some time. The data's QC-status is indicated by the font (colour and italics).
Rainfall: Daily rainfall Observations are nominally made at 9 am local clock time, and record the total for the previous 24 hours. Rainfall includes all forms of precipitation that reach the ground, such as rain, drizzle, hail and snow.
For more information, see: [ About daily rainfall data: http://www.bom.gov.au/climate/cdo/about/about-IDCJAC0009.shtml ] and ["About rain data: http://www.bom.gov.au/climate/cdo/about/about-rain-data.shtml ] and [ About measuring rain: http://www.bom.gov.au/climate/cdo/about/rain-measure.shtml ].
The Monthly rainfall data is the total of all available Daily rainfall for the month. Rainfall includes all forms of precipitation that reach the ground, such as rain, drizzle, hail and snow. [ More information about monthly rainfall data: http://www.bom.gov.au/climate/cdo/about/about-IDCJAC0001.shtml ].
More information about Temperature measurements : [http://www.bom.gov.au/climate/cdo/about/about-airtemp-data.shtml ].
Temperature (Daily maximum or minimum): The Daily minimum or maximum air temperature is nominally recorded at 9 am local clock time. The daily maximum air temperature is the highest temperature for the 24 hours leading up to the observation, and is recorded as the maximum temperature for the previous day. The daily minimum air temperature is the lowest temperature for the 24 hours leading up to the observation, and is recorded as the minimum temperature for the day on which the observation was made. Temperature data prior to 1910 should be used with extreme caution as many stations prior to that date used non-standard shelters. [See: http://www.bom.gov.au/climate/cdo/about/about-IDCJAC0011.shtml (minT) and http://www.bom.gov.au/climate/cdo/about/about-IDCJAC0010.shtml (maxT) ]
Temperature (Mean minimum or maximum, per month) : The Monthly mean minimum (or maximum) temperature is the average of all available daily minima (or maxima) for the month. For detail of daily Temperature, see above. [ For more detail on Mean minimum or maximum, per month, see : http://www.bom.gov.au/climate/cdo/about/about-IDCJAC0002.shtml ]
Temperature (Lowest or Highest per month, for each month) : The Monthly highest (or Lowest) temperature is the highest (or lowest) of all available daily maxima (or minima) for the month. For detail of daily Temperature, see above. [ For more details, see: http://www.bom.gov.au/climate/cdo/about/about-IDCJAC0006.shtml ]
Temperature (Lowest Maximum or Highest Minimum temperature per month, for each month) : The Monthly lowest maximum (or highest minimum) temperature is the lowest (or highest) of all available daily maxima (or minima) for the month. For detail of daily Temperature, see above.
Solar Exposure (Daily): The Daily global solar exposure (per station) is the total solar energy for a day falling on a horizontal surface. It is measured from midnight to midnight. The values are usually highest in clear sun conditions during the summer and lowest during winter or very cloudy days. Units of Measurements are MJ/m2.
The Monthly mean daily global solar exposure is the average of all available daily Solar Exposure for the month.
For more details about the Daily Solar Exposure product, see: [ http://www.bom.gov.au/climate/cdo/about/about-IDCJAC0016.shtml ]. Info about solar exposure: [ http://www.bom.gov.au/climate/austmaps/solar-radiation-glossary.shtml#globalexposure ;
For more details about the Monthly Sol.Exp product, see: [ http://www.bom.gov.au/climate/cdo/about/about-IDCJAC0003.shtml ].
