Australian Capital Territory in April 2018: record breaking April warmth

The Australian Capital Territory experienced record warmth for April, with both daily maximum and minimum temperatures being well above average. Rainfall was generally below average.

Record breaking warm days and nights

  • The Territory experienced record temperatures in April 2018, with daytime maximum temperatures during the first half of the month being particularly warm
  • The mean maximum temperature at Canberra Airport during April was 25.0 °C, which is 4.9 °C above average and the highest April mean maximum temperature recorded at either of the Airport sites
  • Canberra Airport recorded maximum temperatures higher than 28 °C on ten days during the month, doubling the previous record of five days; five of these were on consectutive days from the 5th to the 9th, the first time this has happened in April since records commenced
  • The hottest day at the Airport was 31.8 °C on the 11th; the third warmest April day at the airport and the warmest since 1986
  • Tuggeranong (Isabella Plains) also set maximum temperature records for April, including its hottest April day and its warmest April days on average
  • Daily minimum temperatures were also warmer than average across the Territory
  • The mean daily minimum temperature for Canberra Airport was 8.7 °C, 2.0 °C above average and the equal fifth warmest April on record
  • Tuggeranong (Isabella Plains) experienced its warmest April night and warmest April nights on average
  • The warm days and nights also resulted in the highest April mean temperature on record at both Canberra Airport and Tuggeranong (Isabella Plains)

Below average rainfall

  • Rainfall in April was generally below average across the Australian Capital Territory, with most sites recording 40% to 60% of their typical April rainfall
  • Mount Ginini reported the highest falls for the month, with 43.6 mm, 73% of normal
  • Rain fell at the Airport on four days, less than the April average of seven days
  • Most of the rain fell during the middle of the month as a result of a passing cold front and associated low pressure system

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Extremes in April 2018
Hottest day 31.8 °C at Canberra Airport on the 11th
Warmest days on average 25.0 °C at Canberra Airport
Coolest days on average 15.4 °C at Mount Ginini AWS
Coldest day 6.8 °C at Mount Ginini AWS on the 15th
Coldest night 0.3 °C at Mount Ginini AWS on the 15th
Coolest nights on average 6.8 °C at Mount Ginini AWS
Warmest nights on average 8.9 °C at Tuggeranong (Isabella Plains) AWS
Warmest night 17.2 °C at Canberra Airport on the 13th
Warmest on average overall 16.9 °C at Tuggeranong (Isabella Plains) AWS
Coolest on average overall 11.1 °C at Mount Ginini AWS
Wettest overall 43.6 mm at Mount Ginini AWS
Wettest day 19.0 mm at Mount Ginini AWS on the 23rd
Strongest wind gust 93 km/h at Canberra Airport on the 13th

Record highest April temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Tuggeranong (Isabella Plains) AWS 31.6 on the 11th 30.6 on the 15th in 2004 22 20.9



Record highest April mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Canberra Airport AWS 24.9 24.5 in 2005 80 20.1
Tuggeranong (Isabella Plains) AWS 24.9 24.3 in 2005 21 20.9



Record highest April daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Tuggeranong (Isabella Plains) AWS 16.8 on the 13th 16.2 on the 2nd in 2009 22 6.8



Record highest April mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Tuggeranong (Isabella Plains) AWS 8.9 8.6 in 2009 21 6.8



Record highest April mean temperature
New record
(°C)
Old
record
Years of
record
Average for
April
Canberra Airport AWS 16.8 16.2 in 2005 80 13.4
Tuggeranong (Isabella Plains) AWS 16.9 15.9 in 2016 21 13.9



Summary statistics for April 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
April
2018
Diff
from
average
Highest for
April
2018
Mean for
April
2018
Diff
from
average
Lowest for
April
2018
Total for
April
2018
Average
for
April
Rank of
April
2018
Fraction of
April
average
Canberra Airport 25.0 +4.9 31.8 11th 8.7 +2.0 2.9 29th 19.6 34.7 average 56%
Mount Ginini AWS 15.4 +3.8 22.4 11th 6.8 +3.1 0.3 15th 43.6 59.9 average 73%
Tuggeranong (Isabella Plains) AWS 24.9 +4.0 31.6 11th 8.9 +2.1 3.0 8th 16.6 33.5 average 50%
Note: Observations for “Canberra Airport” are taken from the current site (Bureau number 070351), which opened in late 2008.
Comparisons are made against data from the previous site Canberra Airport Comparison (070014), which ran from 1939 to 2010,
combined with the current site from March 2010 onwards.

Daily maximum temperatures for April 2018
123456789101112131415161718192021222324252627282930
Canberra Airport29.129.924.327.228.929.829.129.830.726.631.830.328.320.218.218.823.021.924.225.323.619.524.226.027.023.719.720.019.319.8
Mount Ginini AWS17.820.417.019.118.519.018.118.619.620.022.419.317.47.26.89.814.613.714.016.515.211.615.516.717.513.110.810.79.112.3
Tuggeranong (Isabella Plains) AWS28.730.424.527.328.829.529.229.430.825.831.630.427.819.517.719.223.321.325.125.223.318.223.925.927.024.219.520.717.620.2
Values are the maximum temperature, usually in the 24 hours from 9 am on the day indicated,
and typically occurred in the afternoon of that day.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily minimum temperatures for April 2018
123456789101112131415161718192021222324252627282930
Canberra Airport9.111.712.114.510.19.213.55.96.59.39.110.217.213.99.711.07.18.55.26.86.010.85.44.45.67.110.34.52.92.9
Mount Ginini AWS7.710.76.16.39.210.99.89.611.110.113.112.69.24.00.31.23.24.36.27.06.37.06.17.310.45.43.40.93.50.8
Tuggeranong (Isabella Plains) AWS9.511.812.514.311.78.914.03.05.614.19.38.816.814.310.011.76.37.94.86.06.412.65.73.65.67.311.85.93.83.0
Values are the minimum temperature, usually in the 24 hours to 9 am on the day indicated,
and typically occurred that morning.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily rainfall for April 2018
123456789101112131415161718192021222324252627282930
Bruce (Australian Institute of Sport) - - - - - - - - - - - - - 12.8
Canberra (Australian National Botanic Ga - - - - - - - - - - - - - 12.8 2.2 - - - - - - - 1.8 - - - - -

Canberra Airport - - - - - - - - - - - - - 12.0 2.4 - - - - - - - 0.2 - - - - - - 5.0
Canberra Parliament House - - - - - - - - - - - - - 16.2 - - - - 0.8 - - - - 6.6
Ginninderra (Charnwood (ACT)) - - - - - - - - - - - - - 6.4 2.0 - - - - - - - - - - - - - - 4.8
Mount Ginini AWS - - - - - - - - - - - - - 12.4 9.8 2.0 0.2 - - - - - 19.0 - - - - - - 0.2
Torrens (Darke St) - - - - - - - - - - - - - 12.2 3.6 - - - - - - - 2.2 - - - - - - 5.0
Tuggeranong (Isabella Plains) AWS - - - - - - - - - - - - - 10.6 3.2 - - - - - - - 0.8 - - - - - - 2.0
Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with → are part of a longer accumulation, which is shown on the final day.
Values over 100 mm have been rounded to the nearest whole millimetre.
Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
Rainfalls coloured
according to the amount
0 1.0 5.0 10.0 15.0 25.0 50.0 100 150 200 300 400 600 millimetres

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Australian Capital Territory using the most timely and accurate information available on the date of publication; it will generally not be updated. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

In September 2017 this summary was broadened to include data from observing sites in or near the Australian Capital Territory “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

This statement has been prepared based on information available at 10 am on Tuesday 1 May 2018. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

Averages for individual sites are long-term means based on observations from all available years of record, which vary widely from site to site. They are not shown for sites with less than 10 years of record, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (very low rainfall is in decile 1, low in decile 2 or 3, average in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

Media
(03) 9669 4057
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