HowOften?

HowOften? is a program that allows you to review long-term rainfall records to see how often rainfall events have occurred in past seasons.

Read about our selection process for including tools on Climate Kelpie

 

Who this tool is for

Farmers and consultants throughout Australia.

Back to top

Questions this tool answers

The tool answers the question: "How often did it rain X mm in Y days between date A and date B?"

You can apply it to many formats. For example, you could ask:

  • How often has there been planting rain in previous years, what were the durations of wet periods and how much runoff was there?

Back to top

What this tool does

HowOften? estimates the chance of a user-specified rainfall event occurring in the future, based on historical data.

It will give you a robust estimate of the probability of a rainfall event based on past rainfall; it is not a forecast.

For example, it can tell you:

  • how often planting opportunities have occurred in your district
  • how seasonal rainfall has fluctuated relative to the Southern Oscillation Index

Back to top

Inputs

HowOften? uses long-term rainfall data from SILO.

Rainfall data for some locations are packaged with the program, others are available by request.

You can also enter your own rainfall data.

Back to top

Outputs

HowOften? produces simple rainfall calendars and graphs. See Figure 1 for an example.

Back to top

Reliability

HowOften? is based on historical data from SILO [link to page of same name] and uses the APSIM [link to page of same name] simulation model.
As climate change starts to affect our weather patterns, the relevance of past data will decrease.

HowOften? is based on historical data from SILO and uses a model similar to that of the APSIM simulation model.

As climate change starts to affect our weather patterns, the relevance of past data will decrease.

Back to top

History

HowOften? was developed by CSIRO's Agricultural Production Systems Research Unit.

It was further developed into the Australian CliMate app and website by the Australian CliMate team.

Back to top

Support available

Dr David Freebairn

Email: david.freebairn@gmail.com

Refer to the HowOften? manual available on the website.

Back to top

Where to get it

Visit the HowOften? website to download the software and manual.

Back to top

Cost

Free

Back to top

JRegistry Object
(
    [data:protected] => stdClass Object
        (
            [pathwaypage] => 0
            [pathwaytype] => 1
            [scale] => 
            [topic] => Rainfall and run-off probabilities
            [cost] => Free
            [summary_commodity] => Grains
            [summary_region] => All
            [tabledisplayscale] => 0
            [tablesubpagetitle] => Page
        )

)


JRegistry Object ( [data:protected] => stdClass Object ( [pathwaypage] => 0 [pathwaytype] => 1 [scale] => [topic] => Rainfall and run-off probabilities [cost] => Free [summary_commodity] => Grains [summary_region] => All [tabledisplayscale] => 0 [tablesubpagetitle] => Page ) )

Print page