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Monday, 2 June 2008 - Seasonal Climate Summary for Canberra_AWS - Product code IDCKGC2xx0
Jump to: Extremes Maps Records Summaries Notes the top
Persistent high pressure systems that extended across the ACT during autumn resulted in dry, settled weather throughout the season. The total autumn rainfall of 60.2 mm at Canberra Airport was well below the historical autumn average1 of 151.4 mm. This is the 11th driest autumn on record for Canberra Airport (current driest is 13.4 mm set in autumn 2004) and the driest autumn since 2006 (55.0 mm). It also marks the 8th consecutive autumn with below average rainfall, and a continuation of the drying trend that has affected the south-east Australian region since the mid 1990s.
See a map of total rainfall. See a map of rainfall deciles.
Warm days and cool nights prevailed during autumn. Persistent high pressure systems over the ACT during the season resulted in clear skies, light winds and dry conditions.
The average maximum temperature for autumn for Canberra Airport was 20.9°C, which is 1.0°C above the historical average1 of 19.9°C. This is the equal 11th warmest autumn on record for average maximum temperatures, and the 12th consecutive autumn with above average maximum temperatures.
The average minimum temperature for autumn for Canberra Airport was 6.2°C, which is 0.8°C below the historical average of 7.0°C. This is the coolest autumn since 2001 for average minimum temperatures at Canberra Airport.
The large variation between day-time and night-time temperatures in autumn resulted in a significant diurnal temperature range. The ACT recorded an average diurnal temperature range (difference between the mean minimum and mean maximum temperature) of 14.7°C, which is 1.8°C above the historical average of 12.9°C.
Some sites had their coldest autumn day (lowest maximum temperature) on record.
See a map of mean maximum temperatures. See a map of maximum temperature anomalies.Some sites had their lowest autumn mean daily minimum temperature on record.
See a map of mean minimum temperatures. See a map of minimum temperature anomalies.At Canberra Airport, the prevailing direction in autumn during the mornings (9am) was SE for about 37% of the time. During the afternoons (3pm) the prevailing direction was NW for 35% of the time.
There were 3 thunderstorms (average 4) and 2 hail days (average nil) reported at Canberra Airport during autumn. Sunshine hours for autumn averaged 8.0 hours per day (average is 7.1 hours per day), which is the 4th sunniest autumn on record at Canberra Airport (records since 1978). There were 19 frosts (average 19), and 16 fogs (average 16).
| Hottest day Highest temperature |
24.1°C at Canberra Airport on 12 Apr 24.1°C at Tuggeranong (Isabella Plains) AWS on 12 Apr |
|---|---|
| Warmest days on average Highest mean daily maximum temperature | 20.9°C at Canberra Airport 20.9°C at Tuggeranong (Isabella Plains) AWS |
| Coolest days on average Lowest mean daily maximum temperature | 11.5°C at Mount Ginini AWS |
| Coldest day Lowest daily maximum temperature | −2.0°C at Mount Ginini AWS on 28 Apr |
| Coldest night Lowest temperature | −5.0°C at Mount Ginini AWS on 29 Apr |
| Coolest nights on average Lowest mean daily minimum temperature | 3.5°C at Mount Ginini AWS |
| Warmest nights on average Highest mean daily minimum temperature | 6.2°C at Canberra Airport |
| Warmest night Highest daily minimum temperature | 10.0°C at Tidbinbilla Nature Reserve on 14 May |
| Wettest overall Highest total rainfall | 146.0 mm at Bendora Dam |
| Wettest day Highest daily rainfall | 75.0 mm at Bendora Dam on 3 Apr |
| Highest wind gust | 83 km/h at Canberra Airport on 2 Apr |
Jump to: Extremes Maps Records Summaries Notes the top
| Record lowest total autumn rainfall | |||||
|---|---|---|---|---|---|
| Total rainfall for autumn 2008 (mm) |
Previous lowest for autumn |
Years of record |
Normal for autumn |
||
| Ginninderra CSIRO | 30.6 | 41.2 | in 1965 | 42 | 154.1 |
| Stromlo Forest | 28.2 | 31.5 | in 2006 | 34 | 153.5 |
Jump to: Extremes Maps Records Summaries Notes the top
This table is very wide and may not fit if printed.
| Summary statistics for autumn 2008 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperatures for autumn (°C) |
Minimum temperatures for autumn (°C) |
Rainfall for autumn (millimetres) |
||||||||||
| Mean for autumn 2008 |
Diff from normal |
Highest for autumn 2008 |
Mean for autumn 2008 |
Diff from normal |
Lowest for autumn 2008 |
Total for autumn 2008 |
Normal for autumn |
Rank of autumn 2008 |
Fraction of autumn normal |
|||
| Sthn Tablelands Gburn-Monaro (district 70) | ||||||||||||
| Canberra Airport | 20.9 | +0.9 | 35.2 | 15 Mar | 6.2 | −0.6 | −2.7 | 19 May | 60.0 | 142.6 | low | 42% |
| Mount Ginini AWS* | 11.5 | 25.3 | 15 Mar | 3.5 | −5.0 | 29 Apr | 131.4 | |||||
| Tuggeranong | 20.9 | −0.3 | 35.8 | 15 Mar | 5.2 | −1.8 | −3.5 | 19 May | 58.8 | 80.4 | normal | 73% |
* new station, historic averages not available
Jump to: Extremes Maps Records Summaries Notes the top
This statement has been prepared based on information available at 11 am on Monday 2 June 2008. Some checks have been made on the data, but it is possible that results will change as new information becomes available.
1Averages: historic average temperatures for Canberra Airport are based on the period 1961 to 1990 which is a convention of the World Meteorological Organisation. The historic average temperatures for Tuggeranong AWS are based on all available records 1996−2007. Rainfall averages at Canberra Airport are based on all years of record 1939−2007.
A note about deciles: Deciles are used to give an element (in this case rainfall or temperature) a ranking. Deciles are calculated by arranging the totals in ascending order (from lowest to highest) then splitting them into 10 equal groups (thus the groups are called deciles). The first group would be in decile range one, the second group in decile range two, etc up to the highest annual totals (highest 10 per cent) being in decile range 10.
Normals are long-term averages 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 20 years of record for temperature and less than 30 years of record for rainfall, as they cannot then be calculated reliably.
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