At Ferny Grove in May overnight temperatures and daytime temperatures were close to average. Ferny Grove saw very little rainfall in May and was well below average that was 12 % of the long term average and lowest since 2004. Mean relative humidity was below average, mean dew point was below average and mean air pressure was above average. There were 0 thunderstorms (0 thunder days).
Mean minimum temperature: 12.7 ºC, 0.2 ºC above average and 0.4 ºC lower than same month in 2019
Mean maximum temperature: 24.2 ºC, equal to long term average and 0.1 ºC higher than same month in 2019.
Mean temperature: 18.4 ºC, 0.1 ºC above average, 0.5 ºC lower than same month in 2019.
Lowest temperature: 9.1 ºC on 4 May 2020 at 3:28 AM. Same month in 2019 was 4.4 ºC.
Highest temperature: 28.1 ºC on 9 May 2020 at 1:40 PM. The same month in 2019 was 28.0 ºC.
Lowest maximum temperature: 15.6 ºC on 23 May 2020 at 8:55 AM. This is the lowest monthly maximum daily temperature for May on record, exceeding the previous record low of 17.7 ºC in 2013 on 16 May at 12:20 AM. This month in 2019 was 28.0 ºC.
Highest minimum temperature: 15.6 ºC on 21 May 2020 at 1:55 AM. This is the lowest monthly May highest daily minimum temperature on record, exceeding the previous record low of 16.2 ºC in 2015 on 18 May at 6:10 AM. This month in 2019 was 19.4 ºC.
Observed minimum temperatures in May were both below and above average throughout the month with many nights close to average. Most of the first 11 days were slightly cool or warm with some warm nights, followed by a mixture of warm and cool nights for the following nights. The 16th to 21st was a warm period with temperatures of 1 ºC to 3 ºC above average followed by a cool period between the 22nd and 27th of 1 ºC to 3 ºC below average. The remainder of the moth was slightly warm or cool.
Maximum temperatures in May were generally above average, with some days close to average. There were however some cool to cold days during the month, mostly between the 20th and 24th. The first 11 days generally saw slightly warm days after the first two days were close to average, peaking at 4 ºC above average on the 9th. On the 11th to 13th temperatures were near average, slightly cool, or slightly warm, warming to 3 ºC above average on the 14th and close to average or slightly warm until the 19th. Cool to cold days followed, especially on the 22nd being 6 ºC below average and the 23rd being 9 ºC below average. The 25th to 30th was slightly warm and the 31st was slightly cool.
Monthly Mean Minimum Grass Temperature: 10.9 ºC (0.7 ºC lower than same month in 2019).
Lowest Minimum Grass Temperature: 6.8 ºC on 24 May 2020 (5 ºC higher than same month in 2019). This coincided with the lowest minimum air temperature of 11.9 ºC for the month.
Highest Minimum Grass Temperature: 14.1 ºC on 21 May 2020 (3.9 ºC lower 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: 3.1 ºC on 24 May 2020 with a minimum grass temperature of 6.8 ºC and an air temperature of 9.9 ºC.
Lowest Minimum Grass Temperature Depression: 0.6 ºC on 9 May 2020 with a minimum grass temperature of 12.3 ºC and an air temperature of 12.9 ºC.
Mean minimum MSL pressure: 1017.8 hPa (1.2 hPa lower than same month in 2019).
Mean maximum MSL pressure: 1022.1 hPa (1 hPa lower than same month in 2019).
Mean MSL pressure: 1019.9 hPa (3.1 hPa above average, 1.2 hPa lower than same month in 2019).
Lowest MSL pressure: 1008 hPa on 23 May 2020 at 2:03 PM. The same month in 2019 saw 1011.3 hPa.
Highest MSL pressure: 1028.1 hPa on 18 May 2020 at 9:39 AM. The same month in 2019 saw 1028.6 hPa.
Mean minimum relative humidity: 46.5 % (0.8 % higher than same month in 2019 and 6 % below average). This is the second lowest on record for May and the highest since the current record low of 45.7 % in 2019.
Mean maximum relative humidity: 86.7 % (1.4 % higher than same month in 2019 and 2.4 % above average). This is the second lowest on record for May and the lowest since the current record low of 80.5% in 2015.
Mean relative humidity: 66.6 % (1 % lower than same month in 2019 and 4.2% below average). This is the lowest on record for May exceeding the previous record low of 67.6 % in 2016.
Lowest relative humidity: 23 % on 3 May 2020 at 3:50 PM (12% higher than this month in 2019). This is the second lowest monthly minimum humidity for May on record and the and the lowest since the current record low of 11% in 2019 on 31 May at 2:05 PM.
Highest relative humidity: 98 % on 9 May 2020 at 7:33 AM (1% lower than this month in 2019).
Monthly mean minimum dew point: 8.6 ºC (1.5 ºC below average). This is the lowest monthly mean minimum dew point for May on record exceeding the previous record low of 8.7 ºC in 2019.
Monthly mean maximum dew point: 14.1 ºC (1.0 ºC below average). This is the lowest monthly mean maximum dew point for May on record since 13.3 ºC in 2011.
Monthly mean dew point: 11.4 ºC (1.2 ºC below average). This is the lowest monthly mean dew point for May on record exceeding the previous record low of 11.8 ºC in 2012.
Lowest dew point: 1.9 ºC on 3 May 2020 at 3:58 PM. This is the lowest monthly minimum dew point for May on record since the current record low of -11.1 ºC on 31 May 2019 at 2:10 PM.
Highest dew point: 18.8 ºC on 21 May 2020 at 1:19 PM. This is the lowest monthly maximum dew point on record for May since 17.9 ºC in 2012 on 4 May at 11:11 AM.
Highest wind gust: 41 km/hr on 2 May 2020 at 11:45 PM. This is the lowest May maximum wind gust since 39.7 km/hr in 2014 on 13 May at 2:23 PM.
Highest wind speed: 28 km/hr on 3 May 2020 at 10:50 AM (Moderate Force Wind).
Total Wind Run: 2555.8 km (435.8 km higher than same month in 2019), 840 km above average and 41.6 % above average. This is the highest on record for May total wind run exceeding the previous record high of 2420 km in 2019.
Mean wind speed: 4.2 km/hr (0.6 km lower than this month in 2019), 0.8 km/hr above average and 23.5% above average. This is the second highest on record for May and the highest since the current record high of 4.7 km/hr in 2019.
Daily Mean Maximum Wind Gust: 24.4 km/hr (0.8 km/hr higher than this month in 2019), 5.6 km/hr above average and 29.5% above average.
Daily Mean Maximum Wind Speed: 12.3 km/hr, 0.7 km/hr higher than this month in 2019), 5.6 km/hr above average and 29.5 % above average.
Dominant Direction: S (S this month last year).
Rainfall total: 12.1 mm, 90.9 mm below average (11.8 % of long term average), 33.1 mm below the long term median and 26.8% of the site median. This is lower than this month last year which was 41.4 mm and lowest May total rainfall since 12 mm in 2004. Automatic rain gauge was 8.4 mm (-30.6 % of manual gauge).
Highest daily rainfall total: 8.6 mm on 22 May 2020. This is the lowest for May highest daily rainfall on record since 8.5 mm on 3 May 2014
Number of rain days: 8 days, 5 less than this month in 2019 and 0.2 days below average.
Highest rainfall rate: 41.8 mm/hr on the 21 May 2020 at 4:03 PM. This is the second highest monthly rainfall rate for May and the highest since the current record high of 111.8 mm/hr in 2019 on 4 May at 2:11 PM.
Highest hourly rainfall total: 5.2 mm on the 21 May 2020 at 11:25 AM.
In May most rainfall were light showers occurring mostly during the middle of the month. On the 21st was some light rain at times, which brought the highest daily total for the month.
There were 5 days of morning dew.
The weather was dominated by onshore winds from high pressure system moderating the temperatures. A complex low pressure system extended a trough that brought some rain on the 21st followed by a cold and dry air mass that brought cool to cold temperatures on the 22nd to 24th. The maximum temperature on the 23rd was a new record low for May.
Long period rainfall totals deteriorated further over all timespans due to continued below average rainfall. 6 monthly rainfall remained above average but was below average for 9 monthly to 48 monthly with the lowest being 368 mm below average for 18 month rainfall.
For May there were 7 existing records exceeded or equalled, along with 6 records that was highest/lowest in at least 5 years.
For more detailed analysis refer to the “Monthly Meteorological Report for May 2020”
Summary of Averages and Extremes for May 2020 for Ferny Grove, Brisbane, Queensland, Australia |
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|
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 |
12.7 |
24.2 |
18.4 |
11.5 |
10.9 |
1.8 |
46.5 |
86.7 |
66.6 |
1017.8 |
1022.1 |
1019.9 |
11.4 |
24.4 |
12.3 |
0.4 |
Min |
9.1 |
15.6 |
13.3 |
4.7 |
6.8 |
0.6 |
23 |
64 |
47 |
1008.0 |
1013.1 |
1010.8 |
1.9 |
10.0 |
3.0 |
|
Max |
15.6 |
28.1 |
20.5 |
17.1 |
14.1 |
3.1 |
79 |
98 |
88 |
1025.3 |
1028.1 |
1026.7 |
18.8 |
41.0 |
28.0 |
8.6 |
Total |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
12.1 |
Summary for May 2020 from long term average for Ferny Grove, Brisbane, Queensland, Australia |
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|
Temperature |
Relative Humidity |
MSL Pressure |
Dew Point |
Wind Gust |
Wind Speed |
Rainfall |
Rainfall as Fraction of monthly average (%) |
Average |
+0.1 |
-4.2 |
+3.1 |
-1.2 |
+5.6 |
+4.7 |
-90.9 |
11.8 |
Min |
+0.2 |
-6.0 |
|
-1.5 |
|
|
|
|
Max |
+0.0 |
-2.4 |
|
-1.0 |
|
|
-25.6 |
|
Monthly averages and extremes for Year of 2020 to Date for Ferny Grove, Brisbane, Queensland, Australia |
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|
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 |
+0.1 |
12.1 |
-90.9 |
8 |
YTD |
18.1 |
29.0 |
9.1 |
37.6 |
23.6 |
+0.4 |
+1.0 |
+0.8 |
740.5 |
+112.7 |
67 |
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 21/6/20. 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”.