Dry September 2019

Striped Honeyeater at the Window

Weekly average temperatures increased slightly, as is usual in September. Unusual day temperatures came early in the month. The first 30-degree day was 18 days early, on the 5th. The next day was the hottest of the month, at 31.9°. During the next 3 days the daily maximum temperature fell by 16.9° to 15.0°, the coldest day of the month. Later, temperatures stayed closer to normal. There were 4 frosts, the usual number.
At the Manilla Museum, 1.2 mm of rain was recorded on the 23rd.

Comparing September months

The last three September months have all been dry, with low dew points, wide daily temperature ranges and not much cloud. They have not been nearly as hot as September of 2013, however.
The rainfall total of 1.2 mm is the 3rd lowest September reading, after 0 mm in 1980 and 1 mm in 1925. By way of contrast, the second graph also includes the deluge of 122.4 mm in September 2016, the 4th wettest on record.

Drought

I will report separately on the on-going drought that continues to break low-rainfall records at durations of 15-months and longer.


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. Recording resumed on 20 July 2019.
My estimates of early morning dew point have drifted anomalously low. From August 2019, I use data from the Tamworth Airport published graphs.
All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

Dry August 2019

Blossoms on a street tree

August Blossoms

Weekly average temperatures steadily increased as is usual in August. Day and night temperatures also were not far from normal. The warmest day reached 27.1° and the coldest night -1.4°. There were 15 frosts, the usual number.
Rain was recorded at the Manilla Museum on the 1st (1.0 mm) and the 12th (4.6 mm).

Weather log august 2019

Comparing August months

This dry month was very like August 2013, with the August months between being mainly rather cooler and wetter.
The mean maximum temperature (20.9°) was above normal by 1.4°, and the mean minimum temperature (3.3°) was near normal. The resulting temperature range (17.6°) was high, agreeing with the rather low cloudiness (26%) and dew point (-1.0°).
The rainfall total of 5.6 mm is at the 8th percentile for August.

Climate for August 2019

Drought

I have reported separately on the on-going drought that continues to break low-rainfall records at durations of 15-months and longer.


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.  No 9 am readings were recorded from August 2018 to 19 July 2019. Recording resumed on 20 July 2019.
My estimates of early morning dew point have drifted anomalously low. From August 2019, I use data from the Tamworth Airport published graphs.
All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

July 2019 had the warmest days

Ruby Saltbush Enchylaena tomentosa

Drought-proof Ruby Saltbush

Only the middle week of July was not warmer than normal. Nearly all days and nights were above average for this coldest time of the year, but none was exceptional. No night minimum was as warm as ten degrees. There were 15 frosts (normally 17), but, as happened in July 2009 and 2010, there were no severe frosts reading below minus two degrees in the screen.
Rain was recorded on the 8th and 9th, estimated as 5.0 mm and 5.5 mm.

Weather log July 2019

Comparing July months

The last three July months saw maximum, mean, and minimum temperatures steadily rising, with the temperature range (17 deg) staying high. That was not true earlier in the decade: from 2008 to 2012 temperatures were steady and the daily temperature range (14 deg) was low, with cool days and warm nights. It was the case again in July 2015 and 2016, as shown here.
Indicators of moisture were again low, but not as low as in July 2018, with its record low dewpoint and cloudiness. The (estimated) rainfall total of 10.5 mm is at the 14th percentile for July.

Climate at July 2019

Drought

I have reported separately on the on-going drought that continues to break low-rainfall records at durations of 15-months and longer.


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.  Since no 9 am readings have been recorded since August 2018, I have substituted my non-standard gauge readings for all days.
All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

June 2019 still warm and dry

Road in Manilla

The Bendemeer road

The second week was 3.2° warmer than normal, the third week cool, and the fourth warm again. There were 12 frosts (normally 13), with that on the 22nd reading minus 4.3° in the screen. It was one of only 20 readings below minus 4.0° this century.
The wettest of the four rain days registered only 2.3 mm.

Weather log June 2019

Comparing June months

The mean temperature for June has changed little in recent years. It has slowly fallen from 11.5° in 2013 to 10.8°. That is higher by 0.5° than the 10.3° that was normal in the first decade of this century. This month’s mean daily maximum (18.3°) and mean daily minimum (3.3°) were also just 0.5° above normal.
This June was a little more moist than last June in its higher dew point and narrower daily temperature range but less moist in cloudiness and rainfall. The low total rainfall of 4.8 mm (est.) is at the 8th percentile, the 12th driest June on record.
Climate for June 2019

Drought

The on-going unprecedented drought is reported in another post.


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.  Since no 9 am readings have been recorded since August 2018, I have substituted my non-standard gauge readings for all days.
All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

May 2019 had the warmest nights

Keepit Dam boom, May 2019

The month began warm, with the night of the 2nd being, at 18.0°, the warmest May night of the new century. There was a second warm spell nearly four degrees above normal about the 20th.
The first frost (by my reading) came on the 12th of May this year, and on the 15th of May last year. The middle date of first frost is May 13th.
There were three rain days (usually four) but nearly all the rain (61 mm) was recorded on the 4th.

Weather log May 2019

Comparing May months

The mean temperature this month (14.6°) was high, but not as high as in May 2007 (15.1°). However, the mean daily minimum temperature (8.1°) was the warmest for May in the new century: above normal by 2.3°.
A rather narrow daily temperature range (13.1°) and high percentage of cloudy days (45%) showed moisture above normal.
The (estimated) rainfall total of 61.8 mm was very high, in the 75th percentile. Because no rain at all had fallen in April, the total for the two months together reached only to the 26th percentile.

Climate for May 2019

Drought

The on-going unprecedented drought is reported in another post.


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.  Since no 9 am readings have been recorded since August 2018, I have substituted my non-standard gauge readings for all days.
All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

No Rain Days in April 2019

Split Rock Reservoir 4-5-19

A warm spell in the third week was 4.2° above normal. There were 29 days over 25°, many more than usual. Anzac Day (25th) was sunny, calm and warm. It reached 28.2°, which was four degrees above average for that day, but not up to the 28.7° of Anzac Day 2002.
There were no rain days (usually four) and the dew point on the 28th reached a record low April value of minus 3.2°. There were no frosts.

Weather log for April 2019

Comparing April months

This month was warm (average 19.8°), but not as warm as April 2018, 2016 or 2005. The mean daily maximum of 27.8° was well below that of April 2005 (29.5°).
There was no rain, as in April 1912, 1925, 1942 and 1971. Dry air was shown by early morning readings of low dew point (5.8°) and very low relative humidity (67%). However, normal moisture was shown by 30% cloudy days and a daily temperature range of 15.9°.

The last seven April months

Drought

The on-going unprecedented drought is reported in another post.


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.  Since no 9 am readings have been recorded since August, I have substituted my non-standard gauge readings for all days.
All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

Very warm nights in March 2019

Photo of dead public lawn

Our Nature Strip

While there were no very high or low temperatures, weekly mean temperatures were high. Warm spells through the second and fourth week-ends were about four degrees high.
There were nine rain days (twice the usual number for March), but none had more than 5 mm until the 30th. A rain front early that morning brought 39 mm.

Weather log for March 2019

Comparing March months

This month was very warm. It was like March in 2018 and 2016, but the nights were warmer. Both the mean minimum temperature (17.9°) and the monthly mean temperature (24.9°) were record high values for March in the 21st century.
It was not a dry month: values of all the moisture indicators were near normal. The (estimated) rainfall of 54.9 mm is very close to the long-term average of 53.4 mm. However, March rainfall at Manilla is strongly skewed, having many values just below the average and just a few values up to 240 mm above it. The median March rainfall is much lower: only 39 mm. This month’s total of 54.9 mm is at the 60th percentile: it is higher than 60% of all historic March rainfall values.

The last 7 March months

Drought

The on-going drought is reported in three posts, with three different kinds of graph:

  • a line graph shows rainfall status in the last two months, with duration on the x-axis and severity on the y-axis;
  • a contour graph shows 25 months sequentially on the x-axis, duration on the y-axis and severity by tints;
  • a duration graph shows how shortages began and ended in the last 20 years, with time on the x-axis and duration on the y-axis.

 


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.  Since no 9 am readings have been recorded since August, I have substituted my non-standard gauge readings for all days.
All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.