Winter 2019 lowest rainfall?

White box eucalyptus tree

White Box Tree

There were several warm spells, mainly as warm days. The warmest was in early July, when days were 4.2° high and nights 4.0°. The only unusual daily temperatures were one high maximum of 27.1° and one low maximum of 11.3° in July.

There were 41 frosts, normally 44.
As in the drought year of 2002, there were only 8 rain days. The highest reading (estimated) was only 5.5 mm on 9 July.

Weather log winter 2019

This winter had the warmest days of the new century (19.5°) but nights that were near normal (3.2°).
Apart from the extremely low rainfall, the other moisture indicators (little cloud, low dew point, wide daily temperature range) were not as severe as in winter 2018.
The total rainfall of 20.9 mm is the 2nd lowest on record for winter. However, it may actually be the lowest. Although the year 1888 had recorded winter rainfall of only 6 mm, there is doubt about that. Daily readings are missing for June and July. The next lowest was 1946, with 29 mm, then 1972 and 1982, both with 32 mm.

winter climate 2019

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. In this season, I used my own readings until 20 July, when the Museum gauge began recording again. My estimates of early morning dew point have become anomalously low. From 1 August 2019, I use values taken from Tamworth Airport graphs at the time of minimum temperature.
All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

2 thoughts on “Winter 2019 lowest rainfall?

  1. Hi Garry,   hmm, another record for the most number of records. You mention that in 1888, there were recorded data which may be a little suspect – I wonder what type of rain gauge was being used then, and how faithfully observed, emptied and recorded?    Al.

    • Hi, Al
      While those numbers for winter 1888 don’t seem secure, the manual record for Manilla Post Office (Station 055031) from 1883 to 2015 is otherwise impeccable. Manilla’s shameful failure to find a volunteer rain-gauge reader in 2015 was a disaster, reflecting badly on the community.
      The responsibility was handed off to the Bureau of Meteorology, who re-purposed an existing automated, telephone-linked flood-warning rain gauge. The record of unserviceability of this gauge, reporting mainly as Manilla (Museum) Station 055312, has been appalling. Through the drought crisis at Manilla in 2017-19, the station failed to report on about half the days, leaving whole months unreported.
      Thankfully, Station 055312 has now been operating correctly for nearly three months from 20 July 2019. Falls recorded were 1.0 mm (1/8/19), 4.6 mm (12/8/18), and 1.2 mm (23/9/19).The 9am reading today (12/10/19) of 16.6 mm agrees well with my own estimate of 16.3 mm.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s