Instructions based on website as at Feb 13, 2016:
. Open https://www.agric.wa.gov.au/weather-stations
. Select buttons "weather data", "interactive map", pick station , "Air temperature"
. On map you will see box pop-up select "live charts" link
. Optional: change URL value "0.08333" to "0.6" (ie 60% of day divides in 30 min intervals on 1280px wide window)
. Bookmark new chart page (e.g. http://bit.ly/agriPER ) because you will never remember how to do this :-p
(I found this so obscure I thought I would share it with @TweetPerth so please share with your friends on social media)
For Phones:
Samsung Galaxy S4 "0.55" will show in 60 min intervals (landscape view)
Samsung Galaxy S4 "0.35" will show in 30 min intervals (landscape view)
Samsung Galaxy S4 "0.30" will show in 60 min intervals (portrait view)
Samsung Galaxy S4 "0.15" will show in 30 min intervals (portrait view)
