Winter 2018 had the driest air

A gum-tree blowing in the wind

Wind-blown Gum-tree

Temperatures varied widely, especially at night. In both mid-July and mid-August, the weekly mean night temperatures were more than 4° low. At these times, the air was extremely dry.
Early in July night temperatures were nearly 4° high, while late in July it was the day temperatures that were more than 4° high. The daily temperature range was almost 21° in mid-July, having been less than 13° in mid-June.
There were 16 rain days, but the highest reading (estimated) was only 10.2 mm.

Weather log for winter 2018

Last winter’s report had been headlined: “Dry air in winter 2017”. This winter was even drier by all measures. In particular, the mean early morning dew point set a new record of -3.0°. The best match in this century is the winter of 2002. Both had warm days, cold nights, wide daily temperature range, little cloud and low dew point.
The total rainfall of 42 mm makes this the 9th driest winter on record, displacing winter 2002, which had 44 mm. (The year 1888 had the lowest winter rainfall total: 6 mm. However, daily readings are missing. The next lowest was 1946, with 29 mm, then 1972 and 1982, both with 32 mm.)

Climate for winter 2018

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. During this winter season 20 daily readings were missed, including several days with significant falls of rain. I have used my own readings for the whole season.

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

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