In July at Ferny Grove overnight temperatures were above average, the highest in 4 years with several warm nights during the month and very few cool nights. Daytime temperatures were close to average and the coolest in 4 years. Rainfall at Ferny Grove was above average and the highest in 8 years. Mean relative humidity was near average, mean dew point was near average and mean air pressure was below average. There were 0 thunderstorms (0 thunder days).
Monthly mean daily minimum temperature: 10.0 ºC, 1.1 ºC above average and 0.4 ºC higher than same month in 2019.
Monthly mean daily maximum temperature: 22.6 ºC, 0.4 ºC above average and 1.3 ºC lower than same month in 2019.
Monthly mean temperature: 16.1 ºC, 0.7 ºC above average, 0.1 ºC higher than same month in 2019. This is the equal highest on record for July and the highest since the current record high of 16.8 ºC in 2017.
Lowest temperature: 5.0 ºC on 6 July 2020 at 5:08 AM. Same month in 2019 was 5.1 ºC.
Highest temperature: 26.1 ºC on 3 July 2020 at 2:12 PM. The same month in 2019 was 27.2 ºC. This is the lowest monthly maximum temperature for July on record since 25.2 ºC in 2015 on 26 July at 2:38 PM.
Lowest daily maximum temperature: 16.7 ºC on 23 July 2020 at 1:30 PM. This month in 2019 was 20.2 ºC.
Highest daily minimum temperature: 15.6 ºC on 26 July 2020 at 8:57 PM.
July minimum temperatures saw several warm nights during the middle of the month and later in the month with comparatively low number of cool nights mostly in two periods. The first cool period was on the 5th to 7th of temperature of 3 ºC to 4 ºC below average. Between the 9th and 13th minimum temperatures were 3 ºC to 5 ºC above average. The second cool period was between the 17th and 20th. The 21st to 28th was above average as much as 7 ºC above average before cooling closer to average at the end of the month.
Maximum temperatures saw several cool days mostly between the 21st and 25th during rainfall, and some days were close to average or above average throughout the month. The 3rd was 4 ºC above average, 4 ºC below average on the 9th and was otherwise relatively close to average at the start of the month. The 10th to 12th was a warm period of up to 3 ºC above average, followed by below average or near average temperatures until the 17th. A warm period of up to 4 ºC above average on the 18th to 20th. The 21st to 25th was below average of up to 5 ºC below average during rainfall before close to average or above average daytime temperatures during the rest of the month.
Monthly Mean Minimum Grass Temperature: 8.4 ºC (1.1 ºC higher than same month in 2019).
Lowest Minimum Grass Temperature: 3.9 ºC on 5 July 2020 (1.2 ºC higher than same month in 2019).
Highest Minimum Grass Temperature: 15.0 ºC on 26 July 2020 (1.9 ºC higher than same month in 2019). This coincided with the highest minimum air temperature of 15.6 ºC for the month.
Highest Minimum Grass Temperature Depression: 4 ºC on 4 July 2020 with a minimum grass temperature of 12.3 ºC and an air temperature of 8.3 ºC.
Lowest Minimum Grass Temperature Depression: -2.8 ºC on 28 July 2020 with a minimum grass temperature of 10.1 ºC and an air temperature of 12.9 ºC.
Monthly mean daily minimum MSL pressure: 1017.4 hPa (1.8 hPa lower than same month in 2019).
Monthly mean daily maximum MSL pressure: 1021.9 hPa (1.5 hPa lower than same month in 2019). This is the second lowest on record for July and the equal lowest since 1021.9 hPa in 2018.
Mean MSL pressure: 1019.6 hPa (0.7 hPa below average, 1.7 hPa lower than same month in 2019). This is the third lowest on record for July and the lowest since 1019.1 hPa in 2018.
Lowest MSL pressure: 1007.9 hPa on 26 July 2020 at 3:29 PM. The same month in 2019 saw 1013.9 hPa.
Highest MSL pressure: 1029.8 hPa on 9 July 2020 at 9:59 AM. The same month in 2019 saw 1030.9 hPa.
Monthly mean daily minimum relative humidity: 46.1 % (6.2 % higher than same month in 2019 and 3.7% below average).
Monthly mean daily maximum relative humidity: 91.1 % (2.8 % higher than same month in 2019 and 3 % above average). This is the second highest on record for July and the highest since the current record high of 94.4% in 2013.
Mean relative humidity: 68.6 % (4.5 % higher than same month in 2019 and equal to the long term average).
Lowest relative humidity: 21 % on 20 July 2020 at 2:30 PM (10% higher than this month in 2019). This is the second lowest monthly minimum humidity for July on record/
Highest relative humidity: 98 % on 26 July 2020 at 12:00 AM (equal to this month in 2019).
Monthly mean daily minimum dew point: 6.8 ºC (0.2 ºC above average).
Monthly mean daily maximum dew point: 12.5 ºC (0.4 ºC below average).
Monthly mean dew point: 9.7 ºC (0.3 ºC above average).
Lowest dew point: -2.6 ºC on 2 July 2020 at 2:38 PM. This is the second lowest monthly minimum dew point for July on record, the lowest since the current record low of -6.8 ºC in 2019 on 14 July at 2:58 PM.
Highest dew point: 17.9 ºC on 14 July 2020 at 12:45 PM. This is the third lowest monthly maximum dew point on record for July, the lowest since 15.6 C in 2014 on 25 July at 3:10 PM.
Highest wind gust: : 46 km/hr on 26 July 2020 at 3:55 PM. This is the second lowest July maximum wind gust, the lowest since the current record low of 31.9 km/hr in 2013 on 31 July at 10:44 AM
Highest wind speed: 23 km/hr on 14 July 2020 at 1:13 PM (Moderate Force Wind). This is the second lowest monthly maximum wind speed for July on record, the lowest since the current record low of 22.5 km/hr in 2013 on 3 July at 1:25 PM.
Total Wind Run: 3.7 km/hr (equal to this month in 2019), 0.9 km/hr above the long term average. This is the equal highest on record for July equalling 3.7 km/hr in 2019.
Mean wind speed: 3.0 km/hr (equal to this month in 2019), equal to the long term average. This is the second highest on record for June and the highest since the current record high of 4.7 km/hr in 2019.
Daily Mean Maximum Wind Gust: 24.4 km/hr (0.2 km/hr higher than this month in 2019), 4.4 km/hr above average and 60% above average.
Daily Mean Maximum Wind Speed: 12.2 km/hr, 0.1 km/hr higher than this month in 2019), 2.2 km/hr above average and 26.4 % above average. This is the second lowest on record for July and the highest since the current record low of 11.6 km/hr in 2010.
Dominant Direction: S (S this month last year).
Rainfall total: 50.4 mm, 16.9 mm above average (150.3 % of long term average), 23.9 mm above the long term median and 189.5% of the site median. This is higher than this month last year which was 17.6 mm and the highest for July since 52.1 mm in 2012. Automatic rain gauge was 35.2 mm (-30.2 % of manual gauge).
Highest daily rainfall total: 23 mm on 26 July 2020. This is the eleventh highest for July highest daily rainfall on record on monthly and daily basis and the highest since 33 mm on 25 July 2008.
Number of rain days: 8 days, 1 less than this month in 2019 and 2.4 days above average.
Highest rainfall rate: 18 mm/hr on the 25 July 2020 at 6:34 PM.
Highest hourly rainfall total: 4 mm on the 9 July 2020 at 12:00 AM.
On the 9th, 10th and 12th were light showers and drizzle with some light rain. Rainfall returned later in the month with further light rain at times and showers between the 24th and 26th. On the 26th the passage of gust front brought showers but with no measurable rainfall.
There were 7 days of morning dew.
Several days of smoke haze in the first week of the month.
Gusty NNW to WSW winds with the apparent temperature several degrees below the air temperature on the 14th.
There was an absence of clear calm nights which prevented the temperature falling throughout the night to become cold before sunrise. On many nights, the wind persisted which resulted in a slow fall in the temperature or the minimum temperature occurring during the middle of the night before warming before sunrise.
During much of the month the weather was influenced by high pressure extending a cool and dry air mass with settled weather. More cloud and rainfall than typical and resulting warm nights were caused by several frontal system that moved thorough. A high pressure ridge and onshore flow from the 9th gave way to the passage of the cold front followed by a upper level trough which cleared on the 12th. A low pressure system deepened off the southern New South Wales and extend dry flow of west to south-westerly winds on the 13th and 14th. A decaying upper trough followed by the passage of a coastal trough along the southern Queensland coast between the 23rd and 26th brought further instability after which the system moved away into the Tasman Sea, deepened and extended further air flow of dry and stable air.
Long period rainfall totals remained below average but improved a little for most periods. The shorter time spans remained above average. 6 monthly rainfall remained above average but was below average for 9 monthly to 48 monthly, with the greatest being 18 monthly rainfall at 236.9 mm below average.
For July there were 2 existing records exceeded or equalled, along with 9 records that was highest/lowest in at least 5 years.
For more detailed analysis refer to the “Monthly Meteorological Report for July 2020”
Summary of Averages and Extremes for July 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 |
10.0 |
22.2 |
16.1 |
12.2 |
8.4 |
1.6 |
46.1 |
91.1 |
68.6 |
1017.4 |
1021.9 |
1019.6 |
9.7 |
24.4 |
12.2 |
1.6 |
Min |
5.0 |
16.7 |
13.5 |
4.5 |
3.9 |
-2.8 |
21 |
75 |
51 |
1007.9 |
1012.4 |
1010.4 |
-2.6 |
17.0 |
6.0 |
|
Max |
15.6 |
26.1 |
19.8 |
19.4 |
15.0 |
4.0 |
87 |
98 |
93 |
1026.0 |
1029.8 |
1027.9 |
17.9 |
46.0 |
23.0 |
23.0 |
Total |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
50.4 |
Summary for July 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 |
+0.7 |
-0.4 |
+1.7 |
+0.3 |
+4.4 |
+4.1 |
+16.9 |
150.3 |
Min |
+1.1 |
-3.7 |
|
+0.2 |
|
|
|
|
Max |
+0.4 |
+3.0 |
|
+0.4 |
|
|
+34.1 |
|
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 |
YTD |
15.9 |
27.1 |
5.0 |
37.6 |
21.5 |
+0.5 |
+1.1 |
+0.9 |
836.4 |
+113.1 |
88 |
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 31/8/20. 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”.