At Ferny Grove, overnight temperatures were above average. Daytime temperatures were below average and the lowest in 9 years. Rainfall was close to average. Mean relative humidity was close to average, mean dew point was near average and mean air pressure was close to average. There were 5 thunderstorms (8 thunder days).
Monthly mean daily minimum temperature: 20 ºC, 0.6 ºC above average and 1.9 ºC lower than same month in 2020.
Monthly mean daily maximum temperature: 30.3 ºC, 0.8 ºC below average and 2.7 ºC lower than same month in 2020. This is the lowest on record for January since 28.7 ºC in 2012.
Monthly mean temperature: 24.9 ºC, 0.7 ºC below average, 2.1 ºC lower than the same month in 2020. This is the equal second lowest on record for January and the equal lowest since 24.9 ºC in 2011.
Lowest temperature: 16.6 ºC on 12 January 2021 at 4:49 AM. Same month in 2020 was 18.6 ºC. This is the second highest on record for January and the highest since the current record high of 18.6 ºC in 2010 on 29 January.
Highest temperature: 36.6 ºC on 16 January 2021 at 12:57 PM. The same month in 2020 was 35.4 ºC. This is the fourth lowest monthly maximum temperature for January on record, the highest since 38 ºC in 2018 on 13 January at 1:43 PM, the equal tenth highest daily maximum temperature and the highest since 37.8 ºC on 14 January 2018 at 1:38 PM.
Lowest daily maximum temperature: 22.7 ºC on 8 January 2021 at 10:01 AM. This is the second lowest monthly and daily lowest daily maximum temperature for January on record and the lowest since the current record low of 22.3 ºC in 2012 on 17 January at 1:20 PM. Same month in 2020 was 27.4 ºC.
Highest daily minimum temperature: 22.3 ºC on 28 January 2021 at 5:21 AM. This is the second lowest daily minimum temperature on record for January and the lowest since the current record high of 21.8 ºC in 2016 on 31 January 2020 at 4:55 AM.
In January minimum temperatures saw a number of slightly warm nights throughout the month accompanied with some below average temperature throughout much of the month. Minimum temperatures were within 1 ºC of the long term average in the first 8 days of the months before cooling to 2 ºC to 3 ºC below average between the 9th and 13th, peaking at 4 ºC below average on the 12th. The 15th,16th and 19th were 2 ºC below average and 2 ºC above average on the 18th. Temperature fell again to 2 ºC to 4 ºC below average on the 24th to 26th and was within 1 ºC of the long term average during the rest of the month, except for 2 ºC above average on the 28th.
Maximum temperatures in January were predominately below average that saw very few warm days during the month. The 1st to 4th was 1 ºC to 2 ºC below average, warmed temporarily to 3 ºC to 4 ºC above average on the 5th and 6th and then below average until the 12th and as much as 8 ºC below average on the 8th. A warm period on the 15th and 16th that rose to 6 ºC above average before cooling back during most of the following days. The 20th to 23rd was 1 ºC to 4 ºC below average and eased to within 1 ºC of the long term average during the rest of the month, though was 2 ºC below average on the 31st.
Monthly Mean Minimum Grass Temperature: 18.2 ºC (2.4 ºC lower than same month in 2020).
Lowest Minimum Grass Temperature: 13.2 ºC on 12 January 2021 (3.7 ºC lower than same month in 2020). This coincided with the lowest minimum air temperature of 16.6 ºC for the month.
Highest Minimum Grass Temperature: 21 ºC on 28 January 2021 (3.7 ºC lower than same month in 2020). This coincided with the highest minimum air temperature of 22.3 ºC for the month.
Highest Minimum Grass Temperature Depression: 3.4 ºC on 12 January 2021 with a minimum grass temperature of 13.2 ºC and an air temperature of 16.6 ºC.
Lowest Minimum Grass Temperature Depression: 0.3 ºC on 30 January 2021 with a minimum grass temperature of 20.1 ºC and an air temperature of 20.4 ºC.
Monthly mean daily minimum MSL pressure: 1010.3 hPa (equal to same month in 2020).
Monthly mean daily maximum MSL pressure: 1014.3 hPa (0.1 hPa higher than same month in 2020).
Mean MSL pressure: 1012.3 hPa (0.1 hPa below average, equal to same month in 2020).
Lowest MSL pressure: 1005.1 hPa on 16 January 2021 at 12:56 PM. The same month in 2020 saw 1002.3 hPa.
Highest MSL pressure: 1019.2 hPa on 20 January 2021 at 9:45 PM. The same month in 2020 saw 1018.4 hPa.
Monthly mean daily minimum relative humidity: 54.1 % (3 % higher than same month in 2020 and 1.2 % above average). This is the highest on record for January since 58.2 % in 2015.
Monthly mean daily maximum relative humidity: 93.9 % (4.2 % higher than same month in 2020 and 2.8 % above average). This is the highest on record for January since 95.3% in 2015.
Mean relative humidity: 74 % (3.6% higher than same month in 2020 and 2 % above average). This is the highest on record for January since 76.7 % in 2015.
Lowest relative humidity: 39 % on 24 January 2021 at 2:01 PM (7 % higher than this month in 2020).
Highest relative humidity: 98 % on 2 January 2021 at 2:08 AM (equal to this month in 2020).
Monthly mean daily minimum dew point: 17.7 ºC (0.5 ºC below average).
Monthly mean daily maximum dew point: 21.7 ºC (0 ºC above or below average).
Monthly mean dew point: 19.7 ºC (0.3 ºC above average).
Lowest dew point: 14.4 ºC on 24 January 2021 at 2:01 PM.
Highest dew point: 25.5 ºC on 17 January 2021 at 12:12 PM.
Highest wind gust: 35 km/hr on 18 January 2021 at 9:29 AM. This is the lowest monthly January maximum wind gust on record exceeding the previous record low of 37 km/hr in 2019 on 27 January at 3:16 PM.
Highest wind speed: 18 km/hr on 18 January 2021 at 6:23 PM (Moderate Force Wind). This is the lowest monthly maximum wind speed for January on record, exceeding the previous record low of 19 km/hr in 2019 on 27 January at 3:16 PM.
Total Wind Run: 4155.2 km (1070.4 km lower than same month in 2020), 103.2 km below average and 1.3 % below average.
Mean wind speed: 2.1 km/hr (3.4 km/hr lower than this month in 2019), 1.6 km/hr below the long term average).
Daily Mean Maximum Wind Gust: 25.2 km/hr (3.3 km/hr lower than this month in 2020), 1.2 km/hr above average and 14.2% above average. This is the second lowest daily mean maximum wind gust on record for January and the lowest since 23.1 km/hr in 2012.
Daily Mean Maximum Wind Speed: 12.5 km/hr, 3.2 km/hr lower than this month in 2020), 3 km/hr above average and 37.7 % above average. This is the second lowest on record for January and lowest since the current record low of 12.4 km/hr in 2012.
Dominant Direction: E (NE this month last year).
Rainfall total: 95.8 mm, 4.2 mm above average (66.1 % of long term average), 28.2 mm below the long term median and 75.8 % of the site median. This total is lower than this month in 2020 which was 183.3 mm. Automatic rain gauge was 87.8 mm (-8.4 % of manual gauge).
Highest daily rainfall total: 30.1 mm on 19 January 2021.
Number of rain days: 19 days, 4 greater than same month in 2020 and 1.9 days below average. This is second highest on record for January and is the highest since 22 days in 2015.
Highest rainfall rate: 145.8 mm/hr on the 16 January 2021 at 7:20 PM.
Highest hourly rainfall total: 27.6 mm on the 16 January 2021 at 7:49 PM.
During the first 10 days of the month were showers, thunderstorms, and light rain. During the middle of the month were some thunderstorms with some moderate falls. A moderate to heavy shower in the evening of the 16th produced 8 mm in 6 minutes. During the rest of the month were light showers on many of these days.
There was 1 day of morning dew.
Cloudy on the 1st, and 4th to 9th.
A S to SE wind change in the evening of the 6th.
A very cold day on the 8th as the temperature rose slowly in the morning before the maximum temperature was reached in the late morning and fell during the rest of the day.
A cold day on the 9th.
The maximum temperature was reached in the late morning of the 11th with the temperature fell a little in the afternoon.
Mostly sunny or sunny on 14th to 16th.
A hot day on the 16th became cloudy in the afternoon and cooled quickly with thunderstorm activity.
Cloud in the afternoon of the 18th with rainfall.
Haze in the morning of the 19th.
Cloudy at times on the 20th and 21st, cloudy periods on 24th, 25th and 31st.
A high pressure ridge and onshore winds combined with surface troughs in the region to bring unstable conditions in the first 10 days of the month and between the 16th and 19th which brought rainfall including thunderstorms. Firm ridges of high pressure were present throughout the month which did not overly limit the instability brought by the passage of the troughs.
Most of the long period rainfall totals continue to remain below or well below average that reduced in January. As compared with the previous month the 6 monthly rainfall worsened a little to 74.7 mm below average, 9 monthly rainfall dropped from 52.7 mm below average to 153.5 mm below average and 12 month rainfall slipped by 86 mm to 8.2 mm above average. 18-month rainfall dropped significantly from 529.5 mm above average to 150.4 mm below average. 24- and 48-month rainfall improved while remaining below average a 163.9 mm below average and 68.8 mm below average respectively, while 36-month rainfall fell by 806 mm to 442.6 mm below average. Compared with the same period in the previous year these totals have generally improved except for 36-month rainfall falling from 124.6 mm above average to 442.6 mm below average.
For January there were 2 existing records exceeded or equalled, along with 10 records that was highest/lowest in at least 5 years.
For more detailed analysis refer to the “Monthly Meteorological Report for January 2021”
Summary of Averages and Extremes for January 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 |
20.0 |
29.9 |
24.9 |
9.9 |
18.2 |
1.7 |
54.1 |
93.9 |
74.0 |
1010.3 |
1014.3 |
1012.3 |
19.7 |
25.2 |
12.5 |
3.1 |
Min |
16.6 |
22.7 |
21.3 |
2.5 |
13.2 |
0.3 |
39 |
86 |
66 |
1005.1 |
1009.9 |
1007.8 |
14.4 |
17.0 |
9.0 |
|
Max |
22.3 |
36.6 |
29.4 |
14.4 |
21.0 |
3.4 |
72 |
98 |
84 |
1015.1 |
1019.2 |
1017.2 |
24.9 |
35.0 |
18.0 |
30.1 |
Total |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
95.8 |
Summary for January 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 |
-0.7 |
+2.0 |
-0.1 |
-0.3 |
+1.2 |
+3.0 |
-49.2 |
66.1 |
Min |
-0.6 |
+1.2 |
|
-0.5 |
|
|
|
|
Max |
-0.8 |
+2.8 |
|
-0.0 |
|
|
+40.7 |
|
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 |
15 |
YTD |
20.0 |
29.9 |
16.6 |
36.6 |
24.9 |
-0.6 |
-0.8 |
-0.7 |
95.8 |
-49.2 |
15 |
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 17/6/21. 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”.