At Ferny Grove, the overnight temperatures were close to average. Daytime temperatures were close to average but was the coolest for March in 8 years. Rainfall was well above average and in the highest 10% of records with frequent rainfall activity and cloud cover throughout the month. Mean relative humidity was above average, mean dew point was near average and mean air pressure was below average. There were 2 thunderstorms (3 thunder days).
Monthly mean daily minimum temperature: 19.4 ºC, 0.2 ºC above average and 0.7 ºC higher than same month in 2020.
Monthly mean daily maximum temperature: 28.7 ºC, equal to the long term average and 0.4 ºC lower than same month in 2020. This is the lowest on record for March since 28.6 ºC in 2013.
Monthly mean temperature: 24 ºC, 0.1 ºC above average, 0.1 ºC higher than the same month in 2020.
Lowest temperature: 14.8 ºC on 31 March 2021 at 6:18 AM. Same month in 2020 was 15.1 ºC.
Highest temperature: 34.6 ºC on 2 March 2021 at 12:35 PM. The same month in 2020 was 35.2 ºC. This is the lowest monthly maximum temperature for March on record since 32.7 ºC in 2016 on 19 March at 12:35 PM.
Lowest daily maximum temperature: 21.3 ºC on 17 March 2021 at 8:58 AM. Same month in 2020 was 20.9 ºC.
Highest daily minimum temperature: 22.6 ºC on 1 March 2021 at 5:33 AM. This is the lowest daily highest minimum temperature on record for March since 22.1 ºC in 2016 on 13 March at 4:10 AM.
Minimum temperatures in March were near average or above average before below average temperatures in the last week of the month. Minimum temperatures were 2 ºC to 3 ºC above average on the 1st, 3rd, 9th, 10th and 15th but was 3 ºC below average on the 5th. Warmer nights of 2 ºC above average on 20th and 21st and on the 23rd to 24th. During the rest of the month were cool nights that were up to 4 ºC below average.
Maximum temperatures during March saw a mixture of below and above average temperatures throughout the month, with a number of near average or below average maximum temperatures in the middle of the month. The 2nd was 5 ºC above average, 2 ºC to 3 ºC below average on the 2nd to 4th and 3 ºC above average on the 5th. The 8th to 10th were warm that were 3 ºC above average and 2 ºC to 4 ºC above average on the 13th and 14th. Cold days then followed that were 5 to 7 ºC below average on the 15th to 17th. After near average temperatures further cool days occurred that were 6 ºC below average on the 23rd and 2 ºC below average on the 23rd. The 24th to 29th was 2 ºC to 3 ºC above average and then 2 ºC below average on the 30th and 31st.
The mean year to date temperature of 24.8 ºC was 0.2 ºC below average and the lowest for January to March since 24.4 ºC in 2013.
Monthly Mean Minimum Grass Temperature: 17.9 ºC (0.4 ºC higher than same month in 2020).
Lowest Minimum Grass Temperature: 13 ºC on 31 March 2021 (0.8 ºC lower than same month in 2020). This coincided with the lowest minimum air temperature of 14.8 ºC for the month.
Highest Minimum Grass Temperature: 21.3 ºC on 1 March 2021 (1.5 ºC lower than same month in 2020). This coincided with the highest minimum air temperature of 22.6 ºC for the month.
Highest Minimum Grass Temperature Depression: 2.8 ºC on 25 March 2021 with a minimum grass temperature of 13.2 ºC and an air temperature of 16 ºC.
Lowest Minimum Grass Temperature Depression: 0 ºC on 22 March 2021 with a minimum grass temperature of 20.6 ºC and an air temperature of 20.6 ºC.
Monthly mean daily minimum MSL pressure: 1011.6 hPa (2.6 hPa lower than same month in 2020).
Monthly mean daily maximum MSL pressure: 1016 hPa (2.6 hPa lower than same month in 2020).
Mean MSL pressure: 1013.8 hPa (1.1 hPa below average, 2.5 hPa lower than same month in 2020).
Lowest MSL pressure: 1007.3 hPa on 6 March 2021 at 4:33 PM. The same month in 2020 saw 1002.9 hPa.
Highest MSL pressure: 1024.5 hPa on 18 March 2020 at 8:48 AM. The same month in 2020 saw 1020.6 hPa. This is the second lowest March monthly maximum air pressure on record and the highest since the current record high of 1017.9 hPa in 2017 on 19 March at 9:45 AM.
Monthly mean daily minimum relative humidity: 60.4 % (8.9 % higher than same month in 2020 and 3 % above average).
Monthly mean daily maximum relative humidity: 96.1 % (4.7 % higher than same month in 2020 and 2.9 % above average). This is the second highest on record for March and the highest since the current record high of 97.6% in 2010.
Mean relative humidity: 78.2 % (6.8 % higher than same month in 2020 and 3 % above average).
Lowest relative humidity: 32 % on 28 March 2021 at 12:32 PM (2 % lower than this month in 2020).
Highest relative humidity: 99 % on 24 March 2021 at 4:24 PM (equal to this month in 2020). This is the second highest monthly March maximum humidity on record and the highest since 100% on 18 March 2020 at 7:59 PM.
Monthly mean daily minimum dew point: 17.5 ºC (0.1 ºC below average).
Monthly mean daily maximum dew point: 21.8 ºC (0.5 ºC above average).
Monthly mean dew point: 19.7 ºC (0.2 ºC above average).
Lowest dew point: 12.1 ºC on 25 March 2021 at 5:09 PM.
Highest dew point: 25.7 ºC on 2 March 2021 at 2:51 PM. This is the equal highest monthly and daily maximum dew point on record for March equalling the current record of 25.7 ºC in 2020 on 7 March at 3:58 PM.
Highest wind gust: 52 km/hr on 2 March 2021 at 5:45 PM.
Highest wind speed: 28 km/hr on 2 March 2021 at 5:45 PM (Light Force Wind).
Total Wind Run: 2157.1 km (1031.8 km lower than same month in 2020), 353.1 km below average and 1.3 % below average.
Mean wind speed: 1.5 km/hr (2.7 km/hr lower than this month in 2021), 1.5 km/hr below the long term average). This is the second lowest on record for March and the lowest since the current record low of 0.8 km/hr in 2012.
Daily Mean Maximum Wind Gust: 23.2 km/hr (2.2 km/hr lower than this month in 2020), 1.7 km/hr above average and 7.9 % above average. This is the lowest daily mean maximum wind gust on record for March since the current record low of 22.3 km/hr in 2011.
Daily Mean Maximum Wind Speed: 12 km/hr, 0.6 km/hr lower than this month in 2020), 3.5 km/hr above average and 41.3 % above average. This is the second lowest on record for March and lowest since the current record low of 5.7 km/hr in 2012.
Dominant Direction: NE (S this month last year).
Rainfall total: 297.3 mm, 173.1 mm above average (239.4 % of long term average), 174.3 mm above the long term median and 248.5 % of the site median. This total is higher than this month in 2020 which was 142.4 mm. Automatic rain gauge was 228 mm (-23.2 % of manual gauge).
Highest daily rainfall total: 129.7 mm on 22 March 2021. This is the highest daily total on record for March since the current record high of 153.5 mm in 2004 on 6 March.
Number of rain days: 17 days, 2 less than same month in 2020 and 4.4 days above average.
The year to date total rainfall was 519.3 mm (88.3 mm above average and 17 % above average).
The year to date number of rain days of 51 was 16 days above the long term average. This is the highest on record as compared with previous January to March totals since 52 days in 2015.
Highest rainfall rate: 99.4 mm/hr on the 2 March 2021 at 5:40 PM. This is the fourth lowest monthly rainfall rate for March on record, the lowest since 80.8 mm/hr in 2016 on 30 March at 4:10 PM, the tenth highest daily rainfall rate and the highest since 192 mm/hr on 6 March 2020 at 5:27 PM.
Highest hourly rainfall total: 22 mm on the 21 March 2021 at 4:46 PM. This is the lowest hourly rain for March since 80.8 mm in 2016 on 30 March at 4:10 PM.
Many days in the first half of the month saw light showers and rain, with a gusty thunderstorm with brief heavy rainfall on the 2nd. The 14th to 20th saw periods of drizzle and light rain with light showers before increasing wet conditions on the 21st to 23rd with drizzle, moderate to heavy rain periods and a thunderstorm. In the last few days of the month were some light showers. Most of the total rainfall in the month occurred between the 14 March and 24 March when 263.3 mm of rainfall fell and 203.3 mm was measured between the 22 and 24 March.
There was 0 days of morning dew.
Sunny and hot on the 2nd before increasing clouds late in the day ahead of a gusty thunderstorm.
Cloudy at times on the 8th and 9th and cloudy on the 11th and was warm early in the day.
The maximum temperature was reached in the late morning on the 11th and 12th.
Cloudy on the 15th to 18th.
On the 15th the minimum temperature was reached just before 9am before falling further during the morning and rose slowly into the afternoon, while remaining below the 9am temperature.
A cold day with rainfall on the 16th and 17th with the maximum temperature reached in the late morning.
On the 18th the minimum temperature occurred late in the previous evening as the temperature rose slowly early in the day, whilst the maximum temperature for the previous day occurring in the early morning.
On the 19th and 20th the minimum temperature was reached at the start of the day before rising during the rest of the early hours.
Cloudy on the 20th to 23rd.
Brief heavy falls with a thunderstorm on the 21st as the rain increased with warm nights between the 21st and 24th.
On the 22nd it was cold with the minimum temperature reached at 9am before falling further during the morning.
The maximum temperature for the 23rd occurred at 9am on the 24th as the rain cleared.
Sunny or mostly sunny on the 25th to 28th.
Cloudy on the 30th.
Moist onshore flow because of persistent coastal ridges were the main feature in the first half of the month. On the 14th and 15th a surface trough moved through the region that was followed by further moist onshore flow that brought unstable conditions with cloud cover. On the 19th a coastal trough and low pressure system developed along the southern Queensland coast which combined with the ridge to draw in tropical moisture and sustain the unsettled conditions. As the coastal trough decayed from the 22nd an inland surface trough and associated upper level trough shifted eastwards over the interior of the state clearing early on the 24th that maintained the unstable conditions. Late in the month the high pressure ridge remained in place but with more stable conditions.
Long period rainfall totals until the end of March 2021 improved for all periods as compared with February 2021. Many of the long period totals became slightly above average, though the longer time periods have remained with negative anomalies. 6 monthly rainfall improved by 179.9 mm to 85.2 mm above average and 9 monthly rainfall improved by 174.6 mm to 66 mm above average. 12 monthly rainfall improved by 149.8 mm but remained 106.6 mm below average. 18 month rainfall saw an improvement of 191.2 mm and was 23.4 mm above average. 24 month, 36 month and 48 month all remained below average but have improved by 188.1 mm to 123.9 mm below average for 24 month rainfall, improved by 106.9 mm to 237.7 mm below average for 36 month rainfall and by 250 mm to 110.3 mm for 48 month rainfall. Compared with the same period in 2020 the long period rainfall totals were mixed between improving and worsening for 6, 9, 12 and 18 monthly but have worsened for 24, 36 and 48 monthly totals. However, many periods have now see lower rainfall deficiencies as compared with the start of summer in December 2020.
For March there were 1 existing records exceeded or equalled, along with 7 records that was highest/lowest in at least 5 years.
For more detailed analysis refer to the “Monthly Meteorological Report for March 2021”
Summary of Averages and Extremes for March 2021 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 |
19.4 |
28.7 |
24.0 |
9.2 |
17.9 |
1.5 |
60.4 |
96.1 |
78.2 |
1011.6 |
1016.0 |
1013.8 |
19.7 |
23.2 |
12.0 |
9.6 |
Min |
14.8 |
21.3 |
19.7 |
1.9 |
13.0 |
0.0 |
32 |
92 |
64 |
1001.9 |
1006.4 |
1004.2 |
12.1 |
15.0 |
7.0 |
|
Max |
22.6 |
34.6 |
27.6 |
16.1 |
21.3 |
2.8 |
97 |
99 |
98 |
1017.3 |
1020.9 |
1019.1 |
25.7 |
52.0 |
28.0 |
129.7 |
Total |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
297.3 |
Summary for March 2021 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 |
+3.0 |
-1.1 |
+0.2 |
+1.7 |
+3.5 |
+173.1 |
239.4 |
Min |
+0.2 |
+3.0 |
|
-0.1 |
|
|
|
|
Max |
-0.0 |
+2.9 |
|
+0.5 |
|
|
+248.5 |
|
Monthly averages and extremes for Year of 2021 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-21 |
20.0 |
29.9 |
16.6 |
36.6 |
24.9 |
-0.6 |
-0.8 |
-0.7 |
95.8 |
-49.2 |
19 |
Feb-21 |
20.3 |
30.4 |
17.3 |
36.1 |
25.3 |
-0.0 |
+0.4 |
+0.2 |
126.2 |
-35.6 |
14 |
Mar-21 |
19.4 |
28.7 |
14.8 |
34.6 |
24.0 |
+0.2 |
-0.0 |
+0.1 |
297.3 |
+173.1 |
17 |
YTD |
19.9 |
29.7 |
14.8 |
36.6 |
24.8 |
-0.2 |
-0.1 |
-0.2 |
519.3 |
+88.3 |
46 |
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 5/7/21. 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”.