A cool moist autumn in 2020

The daily weather log

[Note.
Due to illness, 45 days of this season, from 23rd March to 7th May, were missed for some Manilla values. No values were noted for cloud or soil temperature; mean values shown for the season are estimates only. Missed values of daily maximum and minimum air temperatures were estimated by regression on values from Tamworth Airport Automatic Weather Service.]

Instead of warm spells as in autumn 2019, this season had several cool spells. Three or four had cool days, but one in mid-march had cooler nights. Cool days in late May came with a very narrow daily temperature range, high humidity and cloud.
There were 18 rain days (normally 14) spread through the season, with the highest reading (20.0 mm) on the 1st of May.

Weather log autumn 2020

Comparing autumn seasons

In contrast to the previous two autumn seasons, autumn 2020 was cool and moist. Days (24.4 deg) were 2nd coolest for autumn in the new century (after 2003). Night temperatures were normal, and the mean one degree low.
The rainfall total, 124 mm, was at the 55th percentile, not far below the mean of 134 mm. Other moisture measures were higher: early morning dew point was 9.0 deg, cloudiness 41%, and daily temperature range 13.8 deg.

Climate for autumn 2020


Data. The Bureau of Meteorology automatic rain gauge, Manilla Museum, Station 55312, recorded no readings from 24th February 2020 until 11th March 2020. I used my own readings for that period. Readings later in autumn are from the Manilla (Museum) gauge.

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.

May 2020: still cool and moist

Weather log for May 2020

[Note.
Due to illness, the first seven days of this month were missed for some Manilla values. No actual values were noted for cloud or soil temperature. Daily maximum and minimum air temperatures were estimated by regression on values from Tamworth Airport Automatic Weather Service.]

May weekly mean temperatures were slightly below normal, except in the final days.
The weather varied with three rainy periods about the 1st (20.0 mm), 10th, and 21st. At these times, skies were cloudy, dew points were high, nights were warm and days cold. The daily maximum temperature on the 23rd (10.7°) was the lowest for May in the new century. The first frost came on the 11th May, near the median date for it.

Comparing May months

The climate this May marked a return to the cool and moist conditions of May 2015. It was quite different from May 2018, which was warm and dry, and from May 2019, which was warm and wet.

While the mean monthly temperature (13.0°) was rather low, the mean daily maximum (19.9°) was the lowest on record for May. The mean daily minimum (6.0°) was normal.
The rainfall total of 38.4 mm was at the 59th percentile for May, which was near the average (41 mm). Early morning dew point (4.8°) was also near normal, while moister climate was shown by high cloudiness (42%) and narrow daily temperature range (13.9°).

Drought

I will report separately on the on-going drought.


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. The gauge failed again during February (25/02/2020 ), but was repaired on 11/3/20.
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.

April 2020: cool, moist

Weather log for April 2020

[Note.
Due to illness, all days of this month were missed for some Manilla values. No values were noted for cloud or soil temperature; mean values shown for the month are estimates only. Daily maximum and minimum air temperatures were estimated by regression on values from Tamworth Airport Automatic Weather Service.]

April weekly mean temperatures were one or two degrees below normal, except in the final week.
There were five rain days, with the highest reading of 18.4 mm on the 11th.

Comparing April months

The mean monthly temperature, at 17.7°, was rather low, half a degree below normal. The mean daily maximum, at 24.7°, was one-and-a-half below normal, while the mean daily minimum, at 10.7°, was normal.
Apart from rainfall, the only moisture indicator available this month is daily temperature range. At nearly 2° narrower than normal, it implies more moist conditions than the rainfall. The rainfall total of 32.8 mm was at the 50th percentile for April, which is rather below the average (44 mm).

Drought

I will report separately on the on-going drought.


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. The gauge failed again during February (25/02/2020 ), but was repaired on 11/3/20.
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.

March 2020: cool, moist

Weather log for March 2020

[Note.
Due to illness, 45 days were missed for some Manilla values, beginning in March (23/3/20). No values were noted for cloud or soil temperature; daily maximum and minimum air temperatures were estimated by regression on values from Tamworth Airport Automatic Weather Service.]

March weekly mean temperatures were near normal, but cooler in the second week.
Cloudy skies, with high dew points and rain came early and late in the month. There were nine rain days, with the highest reading of 19.0 mm on the 26th.

Comparing March months

The mean monthly temperature, at 21.8°, was rather low: cooler than in the last six March months. Days, at 28.6°, were third coolest for March in the new century, only March of 2001 and 2003 having cooler days.
Most moisture values were rather higher than in March of 2018 or 2019. The rainfall total of 53.2 mm was at the 60th percentile for March (and near the average (53 mm)).

Drought

I will report separately on the on-going drought.


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. Unfortunately, the gauge failed during February (25/02/2020 ). Until its repair on 11/3/20, I used my own gauge.
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.

2019-20 summer hot and moist

Sef-sown senna plants

Pepper-leaf Senna

Through December and January, this summer had a series of heat waves perhaps worse than those of the previous two summers, and rainfall and humidity were low. Similar droughty weather elsewhere brought catastrophic bushfires.
On the 3rd of February the weather changed dramatically. Heat waves were replaced by spells of cool or normal temperature, with high humidity, overcast days, and rain. Up to that date, cool spells had not occurred since November 2018, 15 months earlier. During those 15 months, regardless of the season, the weekly mean temperature often rose several degrees above normal, but never fell below normal.
Coincidentally, there were 14 rain days in both the hot-dry part of the season (65 days) and in the cool-wet part (26 days).

Weather log summer 2019-20

Seasonal average or total figures for this summer mean little because of the climatic break from 3 February.
Mean temperatures (max, mean, min) were close to the records set in the summers of 2017 and 2019, which they would have exceeded if February had not become cooler. Subsoil temperature remained normal.
In summer 2018-19, two of the moisture measures (daily temperature range and cloudiness) had been near normal, while rainfall and dew point had been low. Now, in 2019-20, rainfall and dew point were higher, making all four moisture measures normal.
The summer rainfall total of 232 mm is at the 55th percentile, very close to the average (227 mm).

Manilla summer climate


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. I have used it since 20 July, when the Museum gauge began recording again.  Unfortunately, the gauge failed during this season (25/02/2020 ). Pending repair, I am using my own gauge. 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.