At Ferny Grove in December overnight temperatures were above average and the highest in 5 years. Daytime temperatures were well above average and record high. Rainfall at Ferny Grove was below average and was the lowest December rainfall total in 6 years. Mean relative humidity was well below average and mean air pressure was close to average. There were 5 thunderstorms (4 thunder days).
Mean minimum temperature: 19.6 ºC, 0.6 ºC above average and 0.1 ºC higher than same month in 2018. This is the highest on record for December since 20 ºC in 2014.
Mean maximum temperature: 33 ºC, 3.0 ºC above average and 2.6 ºC higher than same month in 2018. This is the highest on record for December, exceeding the previous record high of 32.2 ºC in 2009.
Mean temperature: 26.3 ºC, 1.8 ºC above average and 1.4 ºC higher than same month in 2018. This is the second highest on record for December and the highest since the current record high of 26.4 ºC in 2009.
Lowest temperature: 14.4 ºC on 4 December 2019 at 4:59 AM. Same month in 2018 was 14.9 ºC.
Highest temperature: 42.8 ºC on 16 December 2019 at 1:00 PM. The same month in 2018 was 39.8 ºC. This is the highest monthly and daily maximum temperature for December on record, exceeding the previous record high of 39.8 ºC in 2018 on 21 December at 2:47 PM.
Lowest maximum temperature: 26.6 ºC on 25 December 2019 at 9:00 AM. This is the second highest monthly lowest maximum temperature for December on record. This month in 2018 was 23.9 ºC.
Highest minimum temperature: 23.4 ºC on 24 December 2019 at 1:31 AM. This month in 2018 was 23.3 ºC.
Minimum temperatures in December was mostly above average with some nights close to average and a low number of below average nights mostly early in the month. The 4th to 5th was 4 ºC to 5 ºC below average when the coolest temperatures of the month occurred before a warmer period from the 8th. The 8th was 4 ºC above average, 3 ºC above average on the 9th and 3 ºC above average on the 11th. The 12th was close to average, warming to 3 ºC above average on the 13th and cooling again to near average on the 14th. It was 4 ºC above average on the 23rd and 24th and cooled to 2 ºC above average on the 25th to 27th.
In December maximum temperatures were predominately above average especially in the first half of the month. Cool days during the month only occurred in the last week of the month with a low number of close to average days occurring. The month started with a 12-day period of high temperature and was 9 ºC above average on the 5th to 7th with 39 ºC maximum temperatures on these days. The temperature eased back to 2 ºC to 3 ºC above average on the 8th and 9th before warming again to 3 ºC to 6 ºC above average on the 10th to 12th. Cooler temperatures followed briefly with the 13th 1 ºC above average before rising to 2 ºC above average on the 14th, 4 ºC above average on the 15th before the highest temperature of the month which was 13 ºC above average. Cooler conditions then followed with the 17th and 18th close to average before rising to 1 ºC above average on the 19th, 2 ºC to 3 ºC above average on the 20th to 22nd and then easing to 1 ºC to 2 ºC above average on the 23rd and 24th. The 25th was the coolest day of the month being 3 ºC below average, followed by near average on the 26th and cooling to below average as much as 3 ºC below average or close to average for the rest of the month.
Mean minimum grass temperature: 15.8 ºC (0.5ºC higher than same month in 2018).
Lowest Minimum Grass Temperature: 11 ºC on 4 December 2019 (2 ºC lower than same month in 2018). This coincided with the lowest minimum temperature of 14.4 ºC for the month.
Highest Minimum Grass Temperature: 22.8 ºC on 1 December 2019 (0.9 ºC higher than same month in 2018).
Highest Minimum Grass Temperature Depression: 5.3 ºC on 24 December 2019 with a minimum grass temperature of 18.1 ºC and an air temperature of 23.4 ºC.
Lowest Minimum Grass Temperature Depression: 0.5 ºC on 1 December 2019 with a minimum grass temperature of 22.8 ºC and an air temperature of 23.3 ºC.
Mean minimum MSL pressure: 1010.6 hPa (0.5 hPa lower than same month in 2018).
Mean maximum MSL pressure: MSL Pressure: 1015.8 hPa (0.3 hPa lower than same month in 2018).
Mean MSL pressure: 1013.2 hPa (0.1 hPa below average, 0.4 hPa lower than same month in 2018).
Lowest MSL pressure: 998.2 hPa on 2 December 2019 at 3:03 PM. The same month in 2018 saw 1000.4 hPa. This is the second lowest monthly and daily minimum air pressure for December, and the lowest since the current record low of 998 hPa in 2009 on 27 December.
Highest MSL pressure: 1021.2 hPa on 9 December 2019 at 8:07 AM. The same month in 2018 saw 1021.8 hPa.
Mean minimum relative humidity: 32.3 % (14 % lower than same month in 2018 and 9.5 % below average). This is the lowest on record for December exceeding the previous record low of 38.7% in 2009.
Mean maximum relative humidity: 76.5 % (11.2 % lower than same month in 2018 and 9.4 % below average). This is second lowest on record for December and the lowest since the current record low of 86 % in 2009.
Mean relative humidity: 54.4 % (12.6 % lower than same month in 2018 and 9.5 % below average). This is the lowest on record for December exceeding the previous record low of 62.1% in 2009.
Lowest relative humidity: 1 % on 5 December 2019 at 9:21 AM (12 % lower than this month in 2018). This is the lowest monthly and daily minimum humidity for December on record exceeding the old record of 10 % on 5 December 2018 at 7:15 PM.
Highest relative humidity: 91 % on 25 December 2019 at 2:12 AM (6 % lower than this month in 2018). This is the lowest monthly December maximum humidity on record exceeding the previous record low of 95% in 2016 on 26 December at 6:00 AM.
Monthly mean minimum dew point: 8.5 ºC (5 ºC below average). This is the lowest monthly mean minimum dew point for December on record exceeding the old record of 15.3 ºC in 2018.
Monthly mean maximum dew point: 18 ºC (0.9 ºC below average). This is the second lowest monthly mean maximum dew point for December and the lowest since the current record low of 16.4 ºC in 2009.
Monthly mean dew point: 13.3 ºC (2.9 ºC below average). This is the lowest monthly mean dew point for December on record exceeding the previous record low of 16.9 ºC in 2009.
Lowest dew point: -29.8 ºC on 5 December 2019 at 9:30 AM. This is the lowest monthly and daily dew point for December on record, exceeding the previous record of 2.5 ºC on 5 December 2012 at 9:25 PM.
Highest dew point: 22.4 ºC om 25 December 2019 at 11:13 AM. This is the second lowest monthly maximum dew point on record for December and the lowest since the current record low of 20.8 ºC in 2009 on 20 December.
Highest wind gust: 54 km/hr on 11 December 2019 at 10:07 AM. This is the highest December maximum wind gust since 59.6 km/hr in 2017 on the 8 December at 9:32 PM. The maximum wind gust this month in 2018 was 48 km/hr.
Highest wind speed: 27 km/hr on 2 December 2019 at 10:55 AM (Moderate Force Wind). This is the second lowest monthly maximum wind speed for December on record and the highest since 41.6 km/hr in 2017 on 9 December at 5:50 PM
Total Wind Run: 4463.4 km (409.4 km higher than same month in 2018), 1327.4 km above average and 42.3 % above average. This is the highest on record for December total wind run exceeding the previous record of 4054 km in 2018.
Mean wind speed: 6.0 km/hr (1.8 km higher than this month in 2018), 1.9 km/hr above average and 46.3 % above average. This is the highest on record for December exceeding the previous record high of 5.5 km/hr in 2018.
Daily Mean Maximum Wind Gust: 31.5 km/hr (2.8 km/hr higher than this month in 2018), 7.1 km/hr above average and 28.9 % above average. This is the fourth highest daily mean maximum wind speed on record for December and the highest since 33.7 km/hr in 2017.
Daily Mean Maximum Wind Speed: 16.6 km/hr, 1.9 km/hr higher than this month last year, 5.9 km/hr above average and 55.2 % above average. This is the second highest daily mean maximum wind speed on record for December and the highest since 18.8 km/hr in 2017.
Dominant Direction: E (E this month last year).
Rainfall
Rainfall total: 56 mm, 73.2 mm below average (43.3 % of long term average), 32 mm below the long term median and 63% of the site median. This is lower than this month last year which was 80.1 mm. Automatic rain gauge was 54.6 mm (-2.5 % of manual gauge).
Highest daily rainfall total: 21.2 mm on 25 December 2019.
Number of rain days: 7 days, 6 less than this month in 2018 and 3.1 days below average.
Highest rainfall rate: 188.8 mm/hr on the 24 December 2019 at 7:51 PM. This is the highest monthly rainfall rate for December and exceeded the previous record high of 112.8 mm/hr in 2015 on 10 December at 7:27 PM.
Highest hourly rainfall total: 15.4 mm on the 24 December 2019 at 8:45 PM.
There were 5 thunderstorms, with 4 days with thunder, with 2 nearby thunderstorms.
During Decembers there were showers and storms with low or no rainfall early in the month. There were some showers and thunderstorms between the 12th and 14th and between the 24th and 27th, including a severe thunderstorm with fierce electrical activity on the 24th.
There were 0 days of morning dew.
Smoke haze was observed on 16 days caused by continued bushfire weather conditions across the region
Persistent low pressure troughs over the interior of the state produced a dry and stable air mass during much of the month with many days of smoke haze.
The trough produced unstable conditions during the middle of the month and a more active upper-level pattern brought the showers and storms later inn the month.
Long period rainfall totals of between 6 and 24 months exhibited very large negative anomalies compared to the long term average. Many of these records through to December are in the lowest 10% of records.
For November there were 13 existing records exceeded or equalled, along with 8 records that was highest/lowest in at least 5 years.
For more detailed analysis refer to the “Monthly Meteorological Report for December 2019”.
Summary of Averages and Extremes for December 2019 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 |
19.6 |
33.0 |
26.3 |
13.4 |
18.0 |
1.6 |
32.3 |
76.5 |
54.4 |
1010.6 |
1015.8 |
1013.2 |
13.3 |
31.5 |
16.6 |
1.8 |
Min |
14.4 |
26.6 |
23.4 |
5.8 |
11.0 |
0.5 |
1 |
56 |
31 |
998.2 |
1004.9 |
1001.5 |
-29.8 |
21.0 |
11.0 |
|
Max |
23.4 |
42.8 |
31.5 |
24.5 |
22.8 |
5.3 |
72 |
91 |
82 |
1018.2 |
1021.2 |
1019.7 |
22.4 |
54.0 |
27.0 |
21.2 |
Total |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
56.0 |
Summary for December 2019 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 |
+1.8 |
-9.5 |
-0.1 |
-2.9 |
+7.1 |
+5.9 |
-73.2 |
43.3 |
Min |
+0.6 |
-9.5 |
|
-5.0 |
|
|
|
|
Max |
+3.0 |
-9.4 |
|
-0.9 |
|
|
+14.2 |
|
Monthly averages and extremes for Year of 2019 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-19 |
20.8 |
32.0 |
18.5 |
34.3 |
26.4 |
+0.3 |
+1.5 |
+0.9 |
11.2 |
-133.8 |
9 |
Feb-19 |
20.9 |
31.2 |
16.8 |
36.7 |
26.0 |
+0.7 |
+1.2 |
+0.9 |
39.8 |
-122.0 |
13 |
Mar-19 |
20.4 |
31.4 |
14.1 |
41.1 |
25.9 |
+1.1 |
+2.8 |
+1.9 |
236.9 |
+112.7 |
18 |
Apr-19 |
16.4 |
26.7 |
14.1 |
30.5 |
21.6 |
+0.4 |
+0.6 |
+0.5 |
64.9 |
-28.9 |
16 |
May-19 |
13.1 |
24.7 |
4.4 |
28.0 |
18.9 |
+0.7 |
+1.5 |
+1.1 |
41.4 |
-61.6 |
16 |
Jun-19 |
10.9 |
22.5 |
4.4 |
27.7 |
16.7 |
+0.5 |
+2.0 |
+1.3 |
35.9 |
-26.0 |
15 |
Jul-19 |
9.5 |
23.5 |
5.1 |
27.2 |
16.5 |
+0.7 |
+2.7 |
+1.7 |
17.6 |
-15.9 |
10 |
Aug-19 |
9.7 |
24.3 |
6.2 |
28.6 |
17.0 |
+0.9 |
+1.8 |
+1.3 |
11.8 |
-24.7 |
4 |
Sep-19 |
12.1 |
28.2 |
6.9 |
35.3 |
20.2 |
+0.2 |
+2.9 |
+1.6 |
2.8 |
-30.4 |
3 |
Oct-19 |
14.6 |
27.9 |
9.2 |
34.7 |
21.2 |
+0.1 |
+1.2 |
+0.7 |
48.5 |
-16.0 |
8 |
Nov-19 |
17.6 |
32.1 |
11.4 |
40.3 |
24.8 |
+0.0 |
+2.9 |
+1.4 |
14.2 |
-81.7 |
4 |
Dec-19 |
19.6 |
33.0 |
14.4 |
42.8 |
26.3 |
+0.6 |
+3.0 |
+1.8 |
56.0 |
-73.2 |
7 |
2019 |
15.5 |
28.1 |
4.4 |
42.8 |
21.8 |
+0.5 |
+2.0 |
+1.3 |
581.0 |
-501.5 |
123 |
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 25/1/20. 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”.