At Ferny Grove, the overnight temperatures were above average and the highest in 10 years, whilst the daytime temperatures were close to average. Rainfall was below average, but close to the long term median at Ferny Grove. Mean relative humidity was near average, mean dew point was above average and mean air pressure was above average. There were 0 thunderstorms (1 thunder day).
Monthly mean daily minimum temperature: 13.3 ºC, 1.3 ºC above average and 1.2 ºC higher than same month in 2019. This is the second highest on record for September and the highest since the current record high of 14.1 ºC in 2010.
Monthly mean daily maximum temperature: 25.9 ºC, 0.5 ºC above average and 2.3 ºC lower than same month in 2019.
Monthly mean temperature: 19.6 ºC, 0.9 ºC above average, 0.6 ºC lower the same month in 2019.
Lowest temperature: 8 ºC on 27 September 2020 at 5:56 AM. Same month in 2019 was 6.9 ºC.
Highest temperature: 32.6 ºC on 22 September 2020 at 1:08 PM. The same month in 2019 was 35.3 ºC.
Lowest daily maximum temperature: 20.4 ºC on 10 September 2020 at 1:08 PM. Same month in 2019 was 23.4 ºC.
Highest daily minimum temperature: 20.6 ºC on 23 September 2020 at 5:17 AM. This is the highest monthly minimum daily temperature on record for September, exceeding the previous record high of 19 ºC in 2009 on 22 September. Same month in 2019 was 17.1 ºC.
Minimum September temperatures were predominately above average with a low number of cool nights that mostly occurred in the last few days of the month. The 3rd to 7th was a warm period of between 1 ºC and 3 ºC above average. The 18th to 24th was another period of warm nights of at least 2 ºC above average and peaked at 6 ºC to 9 ºC on the 22nd to 24th. The last few nights of the month were below average of 1 ºC to 4 ºC below average.
September maximum temperature saw a mixture of below and above average temperatures. Cool days on the 6th and the 13th of between 1 and 5 ºC below average before mixed temperature observed during the middle of the month. The days warmed between the 20th and 25th that rose to 5 ºC above average on the 24th and 3 ºC above average on the 25th. Late in the month were temperatures that were close to average or slightly below average.
Monthly Mean Minimum Grass Temperature: 11.2 ºC (1 ºC higher than same month in 2019).
Lowest Minimum Grass Temperature: 4.6 ºC on 27 September 2020 (0.7 ºC lower than same month in 2019). This coincided with the lowest minimum air temperature of 8 ºC for the month.
Highest Minimum Grass Temperature: 18 ºC on 23 September 2020 (3.3 ºC higher than same month in 2019). This coincided with the highest minimum air temperature of 20.6 ºC for the month.
Highest Minimum Grass Temperature Depression: 3.4 ºC on 27 September 2020 with a minimum grass temperature of 4.6 ºC and an air temperature of 8 ºC.
Lowest Minimum Grass Temperature Depression: 1.3 ºC on 11 September 2020 with a minimum grass temperature of 13 ºC and an air temperature of 14.3 ºC.
Monthly mean daily minimum MSL pressure: 1018.9 hPa (1.9 hPa higher than same month in 2019). This is the highest on record for September exceeding the previous record high of 1017.2 hPa in 2015.
Monthly mean daily maximum MSL pressure: 1024 hPa (1.5 hPa higher than same month in 2019). This is the highest on record for September exceeding the previous record high of 1022.9 hPa in 2015.
Mean MSL pressure: 1021.4 hPa (3.2 hPa above average, 1.7 hPa higher than same month in 2019). This is the highest on record for September exceeding the previous record high of 1020.1 hPa in 2015.
Lowest MSL pressure: 1006.8 hPa on 25 September 2020 at 4:25 PM. The same month in 2019 saw 1006.8 hPa.
Highest MSL pressure: 1030.4 hPa on 8 September 2020 at 8:30 AM. The same month in 2019 saw 1029.5 hPa. This is the highest September monthly maximum air pressure since 1030.7 hPa in 2015 on 11 September at 9:10 AM.
Monthly mean daily minimum relative humidity: 44.5 % (18 % higher than same month in 2019 and 1.8 % above average).
Monthly mean daily maximum relative humidity: 91.8 % (9.7 % higher than same month in 2019 and 2.5 % above average).
Mean relative humidity: 68.2 % (13.8 % higher than same month in 2019 and 2.1 % above average).
Lowest relative humidity: 12 % on 27 September 2020 at 1:59 PM (6% higher than this month in 2019). This is the second lowest monthly minimum humidity for September on record and the lowest since the current record low of 6 % in 2019 on 4 September at 3:30 PM.
Highest relative humidity: 98 % on 21 September 2020 at 6:53 AM (1% higher than this month in 2019).
Monthly mean daily minimum dew point: 9.3 ºC (0.2 ºC above average).
Monthly mean daily maximum dew point: 16.2 ºC (1.8 ºC above average).
Monthly mean dew point: 12.7 ºC (1 ºC above average).
Lowest dew point: -5.3 ºC on 27 September 2020 at 2:00 PM.
Highest dew point: 21.6 ºC on 22 September 2020 at 3:19 PM.
Highest wind gust: 50 km/hr on 26 September 2020 at 11:15 AM. This is the lowest September maximum wind gust since 42.7 km/hr in 2013 on 16 September at 3:41 PM.
Highest wind speed: 27 km/hr on 26 September 2020 at 12:24 PM (Moderate Force Wind). This is the equal lowest monthly maximum wind speed for September on record, equalling 27 km/hr in 2019 on 9 September at 9:58 PM.
Total Wind Run: 3305.8 km (804.3 km lower than same month in 2019), 415.6 km above average and 15.4 % above average. This is the second highest on record for September total wind run and the highest since the current record high of 4110.1 km in 2019.
Mean wind speed: 4.6 km/hr (1.1 km/hr lower than this month in 2019), 0.6 km/hr above the long term average). This is the second highest on record for September and the highest since the current record high of 5.7 km/hr in 2019.
Daily Mean Maximum Wind Gust: 27.6 km/hr (1.3 km/hr higher than this month in 2019), 2.8 km/hr above average and 11.4 % above average. This is the second lowest daily mean maximum wind gust on record for September and the highest since 26.2 km/hr in 2011.
Daily Mean Maximum Wind Speed: 14.1 km/hr, 0.4 km/hr higher than this month in 2019), 3.8 km/hr above average and 36.7 % above average. This is the lowest on record for September exceeding the previous record low of 27.7 km/hr in 2012.
Dominant Direction: W (NE this month last year).
Rainfall total: 14.2 mm, 19 mm below average (42.7 % of long term average), 6.3 mm below the long term median and 69.3 % of the site median. This is higher than this month last year which was 2.8 mm. Automatic rain gauge was 13.8 mm (-2.8 % of manual gauge).
Highest daily rainfall total: 7.2 mm on 7 September 2020.
Number of rain days: 3 days, 1 less than this month in 2019 and 1.5 days below average.
The year to date total is 854.4 mm (93.4 mm above average and 9.8 % above average) and compared with previous January to September totals is the highest since 1057.9 mm in 2015.
Highest rainfall rate: 47.6 mm/hr on the 6 September 2020 at 12:02 PM.
Highest hourly rainfall total: 5.6 mm on the 6 September 2020 at 12:14 PM.
Low daily rainfall totals with light showers during some days during the month. A thunderstorm passed to the south on the 25th and brought a brief light shower.
There were 6 days of morning dew.
Smoke haze on 1st to 3rd, 25th and 26th.
Heavy fog in early morning of the 14th with visibility down to 150 metres.
A cool to cold day on the 6th under increasing cloud cover accompanied with a S to SE winds in the late morning and some rainfall.
Warm start to the day on the 20th to 24th under cloud cover, along with warm to hot days with sunny skies.
On the 25th a thunderstorm passed to the south and another passed to the north with little rainfall.
Low humidity on the 26th and 27th with dry WSW to NW winds after a NNW to WNW wind change on the 26th.
High pressure ridges along the east Queensland dominated throughout the month that brought generally stable conditions. Some rainfall was brought with the passage of troughs and fronts that produced mostly dry conditions.
Long period rainfall totals remained well below average during most periods while deteriorating further. 6 monthly rainfall fell significantly to 161.7 mm below average being more than 6 months since significant rainfall at the start of the year. 9 monthly rainfall was 79.4 mm above average while 12 to 48-month rainfall was between 72.4 mm below average for 12 month rainfall and 245.3 mm below average for 24 month rainfall.
For September there were 0 existing records exceeded or equalled, along with 3 records that was highest/lowest in at least 7 years.
For more detailed analysis refer to the “Monthly Meteorological Report for September 2020”
Summary of Averages and Extremes for September 2020 for Ferny Grove, Brisbane, Queensland, Australia |
||||||||||||||||
|
Min Temp |
Max Temp |
Mean Temp |
Temp Range |
Min Grass Temp |
Min Grass Temp Depression |
Min Relative Humidity |
Max Relative Humidity |
Mean Relative Humidity |
Min MSL pressure |
Max MSL Pressure |
Mean MSL Pressure |
Dew Point |
Max Wind Gust |
Max Wind Speed |
Daily rain |
Average |
13.3 |
25.9 |
19.6 |
12.6 |
11.2 |
2.1 |
44.5 |
91.8 |
68.2 |
1018.9 |
1024.0 |
1021.4 |
12.7 |
27.6 |
14.1 |
0.5 |
Min |
8.0 |
20.4 |
16.1 |
8.5 |
4.6 |
1.3 |
12 |
70 |
41 |
1006.8 |
1015.3 |
1011.1 |
-5.3 |
19.0 |
10.0 |
|
Max |
20.6 |
32.6 |
25.9 |
18.7 |
18.0 |
3.4 |
66 |
98 |
80 |
1026.5 |
1030.4 |
1028.4 |
21.6 |
50.0 |
27.0 |
7.2 |
Total |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
14.2 |
Summary for September 2020 from long term average for Ferny Grove, Brisbane, Queensland, Australia |
||||||||
|
Temperature |
Relative Humidity |
MSL Pressure |
Dew Point |
Wind Gust |
Wind Speed |
Rainfall |
Rainfall as Fraction of monthly average (%) |
Average |
+0.9 |
+2.1 |
+3.2 |
+1.0 |
+2.8 |
+3.8 |
-19.0 |
42.7 |
Min |
+1.3 |
+1.8 |
|
+0.2 |
|
|
|
|
Max |
+0.5 |
+2.5 |
|
+1.8 |
|
|
-2.3 |
|
Monthly averages and extremes for Year of 2020 to Date for Ferny Grove, Brisbane, Queensland, Australia |
|||||||||||
|
Temperature |
Temperature Anomaly from Long Term Avg. |
Rain total |
Rain Anomaly |
Rain days |
||||||
|
Avg Min |
Avg Max |
Low Min |
High Max |
Average |
Min |
Max |
Average |
|
|
|
Jan-20 |
21.9 |
32.2 |
18.6 |
35.4 |
27.0 |
+1.2 |
+1.5 |
+1.4 |
183.3 |
+38.3 |
15 |
Feb-20 |
21.2 |
30.4 |
19.6 |
37.6 |
25.8 |
+0.9 |
+0.4 |
+0.7 |
389.2 |
+227.4 |
20 |
Mar-20 |
18.7 |
29.1 |
15.1 |
35.2 |
23.9 |
-0.5 |
+0.4 |
-0.0 |
142.4 |
+18.2 |
15 |
Apr-20 |
16.0 |
29.1 |
11.9 |
34.2 |
22.6 |
+0.0 |
+2.7 |
+1.4 |
13.5 |
-80.3 |
9 |
May-20 |
12.7 |
24.2 |
9.1 |
28.1 |
18.4 |
+0.2 |
-0.0 |
+0.6 |
12.1 |
-90.9 |
8 |
Jun-20 |
11.0 |
22.6 |
5.9 |
25.8 |
16.8 |
+0.6 |
+1.2 |
+0.9 |
45.5 |
-16.4 |
13 |
Jul-20 |
10.0 |
22.2 |
5.0 |
26.1 |
16.1 |
+1.1 |
+0.4 |
+1.2 |
50.4 |
+16.9 |
8 |
Aug-20 |
10.1 |
24.0 |
4.2 |
27.9 |
17.0 |
+1.2 |
+1.3 |
+1.2 |
14.8 |
-21.7 |
14 |
Sep-20 |
13.3 |
25.9 |
8.0 |
32.6 |
19.6 |
+1.3 |
+0.5 |
+0.9 |
14.2 |
-19.0 |
15 |
YTD |
15.0 |
26.6 |
4.2 |
37.6 |
20.8 |
+0.7 |
+0.9 |
+0.9 |
865.4 |
+93.4 |
94 |
Based on Bureau of Meteorology Climate summaries (Copyright) of which some data was obtained from. From September 2017 the Bureau of Meteorology Climate summaries were expanded to provide data from official stations in and near the Greater Brisbane “Greater capital city Statistical Area” (GCCSA).
Data Copyright Ferny Grove Weather 2020, Produced 30/11/20. Data Checking has been carried out but errors may still be present and therefore there is no assurance of correctness. Corrections may be made at a later data if errors or deficiencies are found and/or improvements in data handling techniques are made, though data with major improvements may not be updated in this summary. Data measured with professional moderate accuracy equipment. This replaced non professional equipment of low accuracy with differences in the measured data. The new equipment measures the daily average wind speed and wind run about 40 % higher. Daily rainfall and grass minimum temperature is measured using non-professional equipment of moderate accuracy.
Site Commencement data is April 15 2009 except for daily rainfall which commenced on January 1 1987. Not all variables have been measured over the entire station record. Most variables are measured over a 24 hour period ending in the evening and over a 24 hour period from midnight effective October 5 2018. Maximum temperatures are measured over the 24 hours from 9 am on the day of measurement. Minimum temperatures are measured over the 24 hours to 9 am of the day of measurement. Rainfall is measured over 24 hours to 9am and recorded on that day. This is the same as the official time standard. Some rainfall measurements are not made at 9am and is adjusted based on the automatic record. Minimum Grass Temperature is measured over an approx. 12 hour period ending in the early morning. MSL refers to Mean Sea Level, which is the standard meteorological method of measuring air pressure reduced to sea level based on both elevation and temperature. Grass Minimum Depression is the difference of the grass minimum temperature from the air temperatures and is a positive value when the grass temperature is below the air temperature.
Up until March 9 2019 automatic records as Dew Point, Average Wind Speed, Dominant Wind Direction, Wind Run, Rain Rate and Hourly Rain are measured over a 24 hour period starting at midnight and recorded for that day. This started on the 6 October 2011. The automatic record is used for some data and also may be used if data is not available/ not suitable. From March 9 2019 the automatic record became the official record instead, simplifying this process. Until replaced on 5 October 2018 the temperature and humidity sensor is under exposed so minimum temperature and maximum humidity are incorrect and low accuracy rain gauge is used which are not used as the site’s official record. This data limitation does not apply to other measurements of temperatures, air pressure and humidity, wind gust, daily and monthly rainfall and rain days elsewhere in this summary which are recorded separately and form the official record for this site. The replacement equipment is sited in more exposed locations and therefore the limitations don’t apply, though the automatic daily rainfall doesn’t form the official data for the site.
Long term averages are based on all available long period past measurements from October 2019 whilst for non automatic rainfall is based on 1987 to 2017 average from the station record, while. Prior to this the long term average for Temperature, Relative Humidity and Air pressure is based on 2009 to 2015 average from the station record and wind speed is based on the 2010 to 2018 average from station record. Wind Run is 2011 to 2018 and Rain Rate and High Hourly Rain is 2011 to 2017.
The Fraction of monthly average expresses how much has fallen in respect to the long term average listed as a percentage. The decile ranking compares the rainfall total to the historical record for the site where the record is divided into 10 equal groups. Decile 1 is the lowest 10% of the record (10th percentile) and Decile 10 (90th percentile) is the highest 10% of the record. Decile 1 is considered “very low”, decile 2 and 3 “low”, decile 4 to 7 “average”, decile 8 and 9 “high” and decile 10 “very high”.