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Summer lows above 25C (77F) are exceptionally rare in Rome.
Even during the nastiest heat waves minimums won't normally be higher than 23-24C (73-75F).
I voted "never", but maybe 80F lows can happen once or twice a century.
Location: The Valley Of The Sun just east of Canberra
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80F+ lows are a record breaking event here in Sydney, which might come as a surprise to most people. At the conclusion of a week long heatwave in February 2011, an 82F/27.6C low was recorded at the official Observatory Hill site. However, other stations outside of the urban core managed to fall just below 80F. Since the site I use to dredge up the figures is undergoing maintenance at the moment, I can't review the complete data from that morning.
Sydney is usually saved from extremely hot nights by the Great Dividing Range, which acts as a buffer to wind originating from the hot inland. The hot NW'lys can breach the ranges during the day since mixing is greater, leading to temps well over 100F at times. Additionally, a seabreeze usually arrives by early evening moderating temperatures further. However, as a consequence we get many humid nights around 70F which aren't really that much more comfortable than a dry 80F night!
Perth and Adelaide usually see several 80F+ nights a season because hot interior winds don't have to overcome a significant topographical barrier (especially in Adelaide's case). Melbourne can also see the odd 80F+ night.
Perth and Adelaide usually see several 80F+ nights a season because hot interior winds don't have to overcome a significant topographical barrier (especially in Adelaide's case). Melbourne can also see the odd 80F+ night.
Actually if you look at the stats here Perth doesn't get 80F+ nights very often at all. Seems to be much more common in Adelaide though (with an incredible record of 33.9C!), I wonder why?
Location: The Valley Of The Sun just east of Canberra
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You're right, there are less 80F nights in Perth (or Perrrrrrrrrrrfffffffffffffffffffffffffffffffffffff fff) than I thought. Probably the same two factors at work here as for Sydney, namely the Darling Ranges to the east (though they are significantly lower than the Blue Mountains) and the frequency of the 'Fremantle Doctor' seabreeze.
Adelaide though has no range to the direct north which is where the hot interior winds make their entrance. The Mt. Lofty ranges to the east might possibly make the situation worse by acting to funnel the northerly?
Trust me, you don't want lows in the 80's. The air turns dangerous and toxic. It will suck the living daylights out of you before you can walk a couple meters. I was born in lethally hot Chennai, India, the worst and deadliest climate this earth has to offer. Lows around 80 F occur for 10 months straight without any break. Thank god I am out of there.
Now I understand why all the guys from south India where I'm working in Kuwait started wearing heavy coats and stocking caps when the temperature dips just a few degrees below 70s. It's funny seeing them wear even heavier coats and earmuffs on the one or two days a cold front from Russia drops the T maybe into the upper 40s or lower 50s!
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