Guest essay by Bob Fernley-Jones
Well Melbourne (Oz) sure does, (and we are the butt of a few intercity jokes, a polite one being; we can have “four seasons all in one day”). The following graphic (source) of an extreme example when we had tragic bushfires in 2009 shows how wind direction, strength and duration can have a dramatic effect:
My interest was perked when our nice weatherman on ABC TV news recently announced two nights in a row that Melbourne had experienced the hottest July (midwinter) on record. That’s odd I thought, because me living in a NE suburb didn’t notice anything unusual. I Googled for: melbourne + “hottest July” and found that it was viral out there. And, repeating that search today there were 15,900 hits, although there were imperfections in the results by page 10 at least. Well anyhow, next stop was the BoM temperature records for this our smallest mainland State, and:
[Note: Correction; temperature difference should be (only 0.36F) BF-J]
It seems that for our State, last July was rather ordinary for about the last four decades.
Here follows a tabulation of BoM daily weather data for Melbourne for last July with my highlighting added, (see footnote for the two locations used in this dataset, which strangely are not available for St Kilda as reviewed in figure 1 and vice versa):
Notice that very few days had cool winds between SW and SE; but just one in the morning and four in the afternoon out of the 31 days. So why would the city warm more than the State as a whole because of sustained north winds from the hot centre, (deserts)? So let’s take a peek at the city weather station, courtesy of Google maps and contemplate UHI (Urban Heat Island) effect as an additive factor, in this view looking west:
This is no longer a regional weather station office as it likely was when it was set-up, and here follows some demographic stuff according to Wikipedia:
Here follows an adapted Google satellite view in which Google confusingly “enhances” traffic routings. It appears to have been taken on a Sunday afternoon:
And, here follows a Google street shot looking east, including the edge of the park to the north. [BTW, for NH readers the midday sun is from the left, (north).]
Is there a desert near you, or cooler ocean breezes?