Summer 2017-18 very warm

Many cockatoos in a tree

Noisy Cockatoos

The heat waves of this summer were several degrees cooler than those of last summer. Also, unlike last summer, there were several cool spells between them. Arid spells with extremely low dew points came in mid-January and mid-February.
While last summer had 12 very hot days (over 40°), this summer had only 4; not as many as in the summers of 2013-14 (5), 2003-04 (6) or 2002-03 (5).
For most of the season, as falls of rain were light, and came at increasingly long intervals, the soil became very dry. That changed on 25 February, which had rainfall of 54 mm.

Graphical weather log for summer 2017-18

While this summer is the second-hottest of the new century in Manilla, its mean temperature (26.6°) is a degree below last summer’s 27.6°, and close to that of 2005-06 (26.3°). The subsoil temperature has been low (24.6°) in each of the last three summers. Two other measures have held steady, but a little high: cloudiness at 38%, and daily temperature range at 16°.
While the mean dew point is lower (less humid) than in last summer, the total rainfall is higher. At 140 mm (estimated), the rainfall is still well below the summer mean of 227 mm. It is at the 20th percentile, perhaps the 25th driest summer from 1883.

Climate for summer 2017-18


Data. A Bureau of Meteorology automatic rain gauge operates in the museum yard. From 17 March 2017, 9 am daily readings are published as Manilla Museum, Station 55312.  These reports use that rainfall data when it is available. That gauge failed (again) on the 25th of September 2017, and later readings are from my non-standard gauge.

All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

2 thoughts on “Summer 2017-18 very warm

  1. Hi Garry,   two years ago, Anna and I were returning from Burketown, she by car, I by glider, and we were stopped at Winton for five days while a steady hot blue stable sou-easter of around 50kmh at ground level, blew. In this time, we saw a reported dewpoint at Longreach on the BoMsite of minus 22. I haven’t seener a lower; have you?    DD

  2. I don’t know much, DD.
    There was quite a lot about dew point extremes (mainly about high ones) on a weatherzone forum thread seven years ago.
    http://forum.weatherzone.com.au/ubbthreads.php/topics/929194/Highest_dew_points_with_temps_
    I cannot find Bureau of Meteorology data for extreme recorded values of relative humidity or dew point, but this link from the USA claims that Coober Pedy, once had dry bulb plus 93 degrees and dew point minus 21 degrees (presumably Fahrenheit) for a relative humidity of 1%.
    http://articles.chicagotribune.com/2011-12-16/news/ct-wea-1216-asktom-20111216_1_relative-humidity-zero-dew-point

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