MaxMax, as has been pointed out, for timed GPS activities weather information is there. I surmise that Garmin Connect acquires it from an external weather information service provider, on the basis of the time and vicinity in each such activity record.
You cannot manually supply or overwrite this weather information, even if or when it is inaccurate, or fails to match your recollection, but you can enter freeform text in the Notes section of an activity record, which is (usually!) searchable. That means you can manually encode all sorts of information in the content if you really wanted to, or just compose a description of the relevant aspects of the weather using consistent language and terminology.
philipshambrook, strange as it may sound, perhaps the external weather information service used by Garmin Connect simply does not provide cover for Bendigo.
Hmmm. I never noticed before that the weather information panel can be expanded with a click.
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By the way, the implementation of the tooltip for temperature is incorrect, in that there is a redundant degree symbol.
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OK, so it seems the outdoor (GPS-enabled) activity has to be near an airport or aerodrome to get the weather information.
philipshambrook, I found a few more of your activities near Melbourne and Perth that has weather information. •••• Maybe you can look for something near Auckland or Wellington?