Mmm, 100°F is 37°C or thereabouts . . . South Africa is (apparently) similar to Australia in a lot of ways, temperature wise I looked up the following for Brisbane, the capital of the State of Queensland and, as it's still spring here, these are the average temperatures . . .
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
29° 29° 28° 26° 23° 21° 20° 22° 24° 26° 28° 29°
these are the maximums (averaged)
21° 21° 19° 17° 13° 11° 10° 10° 13° 16° 18° 20°
these are the minimums (averaged)
. . . it does get hotter west of us (west of anywhere really,
) . . . but, the record in Australia is held by Queensland, with the Highest Recorded Temperature being at Cloncurry, 53ēC in 1889! And of course, there's Marble Bar (Western Australia) a town that holds the record for the longest 'hot spell' . . . Highest Average Monthly Temperature, 160 days/year over 37.5ēC!
And for those interested to know, it does get COLD in Australia, the Lowest Recorded Temperature was at Charlotte Pass, New South Wales (in the Australian Alps) of -23ēC in 1994!