October 2024 Weather Report

 The summary is fairly straightforward: moderate temperatures and continuing dry.

Rain

What is this thing called rain?  The total miserable fall for October was 19.2mm, the third lowest for the period for which I have records (starting in 1977).  For the last three months the % of median fall has been 36, 89 and now 31.  I will not bother with daily rainfall, other than to note the highest fall (over half the monthly total!) was 10mm on the 5th,  To illustrate  the bleedin' obvious, the month was  well below last year and the median.

My prorata estimate of the annual fall has been in more less constant decline since 30 July with the outcome now below 1000mm for the first time since 5 June.

Temperatures

 The temperature anomaly ended the month at -0.08C, so a little cool.  the development of the anomaly though the month shows a cool start which rapidly warmed up and then wobbled about close to zero for the rest of the month.

A time series of anomaly values shows very variable raw data readings but the 12 month moving averages (removing seasonal variation) and the trend line thereof show a drop from peak values.  I'd still keep the sunscreen handy.

A plot of daily extreme values and the average of them since 2019 shows a lot of variation.  There was no period of consistently above or below averages.

There were no periods of consecutive days with maximum and minimum both significantly above or below the average mean temperature for the month.  The average daily temperature range of 9.5C was fairly close to the average range of  10.2C.

Minimum temperature

The lowest temperature was 4.6C on the 9th.  The average minimum of 10.36 was a little above the long term series including BoM data for years before 2019 but below the average of the 6 years at Angophora Drive and very similar to October 2023.

There were 8 days more than 1 SD below the mean minimum for October of which 2 were more than 2 SD below the mean. Only 3 minima were significantly above the mean minimum.

Maximum Temperatures

The highest maximum recorded in the month was 26.2 on the 22nd.  The average maximum (20.33C) was a little above the average for Angophora Drive (but exactly on the longer term average).

There was only 1 day more than 1 SD below the mean maximum for October. 3 maxima were significantly above the mean maximum.

Humidity

For the first 16 days of the month the rH readings for the 2 standard times were very close, with the afternoon reading lower than expected.  For the second half of the month the pattern was closer to expectations.

Overall the average rH for 0900 hrs ended up below the average for the previous 5 years while that for 1500 hours was below, but within 1 percentage point of, the average. 

Wind

October is traditionally a windy month. However the average run for this month was the shortest by several kilometres of the 6 Octobers for which I have records.  This is due to a number of quite calm days (run <50km) and there not being any days with long runs (>300km).  The longest daily run was only 251km.  

Tempest data

A friend with a weather station near the wharf has given me access to his information published through the Tempest system.  The data I extract therefrom are lightning strikes (within 40km) and solar radiation.

Lightning strikes

Only 12 strikes recorded in October.

Solar radiation

The system records maximum radiation during the day and average radiation.  I average them to get an index for illustrative purposes. 

Clearly there is a seasonal pattern evident so I have calculated a 12 term moving average to smooth that effect.  The smoothing is very effective, showing an almost constant value. (Unlike the feed-in tariff of course which drops constantly.)