Friday, 1 June 2007 - Monthly Climate Summary for Tasmania - Product code IDCKGC17R0

Tasmania in May 2007:
The warmest May on record

Summary

Tasmania had its warmest May on record in 2007. Both maximum and minimum temperatures were well above average, with few cold outbreaks ensuring there were far more warm days and far fewer cold ones than normal. After many dry months, there was considerable rain in the north and west.

A separate summary has also been prepared for autumn and a national overview for May will be available next week. 

Details

Maximum temperature records smashed: Although the month ended with a cold snap, mean maximum (daytime) temperatures were at or near record highs for May across the state. Temperatures were about 1.5°C above the May average in the north, but over 3°C above average in the southeast. Hobart's record of the last 125 years was just one of those broken. Less "cold outbreaks" (where cold air from the far south is transported across the state) meant there were far fewer cold days, and far more warm days than in is typical for May. In a normal May in Hobart, at least half the days don't reach 15°C: in 2007 there were only six such cold days (in Launceston there were only five, compared to an average of ten). Hobart had four times as many days over 18°C than is usual for May. But there were no especially hot days: the highest for the month was 22.4°C at Campania on the 15th, well short of the 27.4°C recorded on Flinders Island in 1997.

Minimum temperature records also smashed:
Mean minimum (overnight) temperatures were also at or near record highs for May, at about 2 to 3°C above average; sites with a long history were among those to set new May mean minimum temperature records. There were no particularly warm nights, but persistent and sometimes quite string northwesterly winds meant almost all nights were warmer than average. The temperature did not once drop below 5°C in Hobart:in a normal May there are about seven nights that cold. Meanwhile, Hobart had a record twenty nights above 10°C compared to an average of just five; Launceston had eleven compared to an average of four. Similar tales were told across the state. Lake St Clair's −1.7°C on the 7th pales when compared to the record −10.5°C recorded at Liawenee last year.

Very wet in the north and west: Although there were few cold outbreaks, moist northwesterly winds brought moderate to heavy rain to the north and west of the state, with many sites reporting almost twice their normal rainfall for the month and totals of around 200 mm common in the northwest. Some places in the north, including Launceston, had their wettest May on record, with some others having their wettest May for many years. Several sites in the north and west had their wettest month for quite a while: Burnie's 175 mm was the wettest there since August 2001. However, these falls by themselves have not been enough to remove the long-term rainfall deficiencies being experienced in many parts of the state. Rain was below average on the southeast coast, with some sites reporting less than 10 mm for the month.

Windy as well:  It was also a very windy month, with gale force winds registered somewhere in the state every day of the month, and storm force winds registered on at least 13 days. This was due to the same persistent northwesterly winds that kept minimum temperatures and rainfall up. The 6th, 9th, 19th and 30th were particularly windy with gusts over 150 km/h recorded at some sites on these days.  


Further information

Tom Delfatti
Tasmania and Antarctica Climate Services Centre
Bureau of Meteorology
Phone (03) 6221 2043
Email climate.tas@bom.gov.au

Extremes

Hottest day
Highest temperature
22.4°C at Campania (Kincora) on the 15th
Warmest days on average
Highest mean daily maximum temperature
19.0°C at Bicheno (Council Depot)
Coolest days on average
Lowest mean daily maximum temperature
8.4°C at Mount Read
Coldest day
Lowest daily maximum temperature
2.3°C at Mount Wellington on the 31st
Coldest night
Lowest temperature
−1.7°C at Lake St Clair National Park on the 7th
Coolest nights on average
Lowest mean daily minimum temperature
2.5°C at Liawenee
Warmest nights on average
Highest mean daily minimum temperature
12.8°C at Hogan Island
Warmest night
Highest daily minimum temperature
16.7°C at Flinders Island Airport on the 29th
Wettest overall
Highest total rainfall
593.2 mm at Mount Read
Driest overall
Lowest total rainfall
9.0 mm at Premaydena Hatchery
Wettest day
Highest daily rainfall
71.2 mm at Strathgordon Village on the 5th
Highest wind gust
157 km/h at Maatsuyker Island on the 30th

Records

Record highest total May rainfall

Total rainfall
for May 2007 (mm)
Previous highest
for May
Years of
record
Normal for
May
Barrington Post Office 239.8 229.3 in 1965 41 106.7
Scottsdale (West Minstone Road) 207.4 181.4 in 1997 36 103.0
Westbury (Birralee Road) 141.4 139.0 in 1997 30 71.0
Launceston (Ti Tree Bend) 140.6 138.8 in 1985 28 64.5

Highest total May rainfall for at least 20 years

Total rainfall
for May 2007 (mm)
Most recent higher
for May
Years since
higher
Normal for
May
Launceston Airport Comparison 128.6 183.6 in 1958 49 60.8
Ringarooma (Fry Street) 276.8 402.0 in 1958 47 118.4
Mole Creek 257.1 269.3 in 1965 42 111.1
Pioneer (Main Road) 194.6 236.4 in 1969 38 95.3
City of Melbourne Bay 180.6 201.6 in 1975 32 108.5
Yolla (Sea View) 291.4 305.6 in 1975 32 144.1
Memana (Babel Farm) 135.6 232.4 in 1974 31 82.4
Irishtown 223.8 254.8 in 1975 27 122.9
Wynyard Airport 216.4 313.6 in 1958 24 99.4
Oatlands Post Office 66.8 83.8 in 1986 21 42.9

Record lowest total May rainfall

Total rainfall
for May 2007 (mm)
Previous lowest
for May
Years of
record
Normal for
May
Premaydena Hatchery 9.0 9.4 in 1991 102 65.6



Record highest May temperature

Highest temperature
in May 2007 (°C)
Previous highest
for May
Years of
record
Normal for
May
Mount Wellington 14.9 on the 11th 14.4 on the 5th in 1972 28 5.4




Record highest May mean daily maximum temperature
Mean daily maximum
temperature
for May 2007 (°C)
Previous highest
for May
Years of
record
Normal for
May
Hobart (Ellerslie Road) 17.3 16.9 in 1980 126 14.4
Cape Bruny Lighthouse 16.2 15.4 in 1999 82 13.4
Bushy Park (Bushy Park Estates) 17.1 17.0 in 1939 73 14.2
Grove (Comparison) 17.2 16.6 in 1999 53 14.5
Swansea Post Office 18.2 17.8 in 1999 51 15.9
Eddystone Point 17.8 17.3 in 2002 49 15.7
Hobart Airport 18.0 17.4 in 1999 49 15.1
Orford (Aubin Court) 17.6 17.4 in 1972 39 15.7
Bicheno (Council Depot) 19.0 17.9 in 1972 33 16.4
Mount Wellington 8.4 8.0 in 1993 28 5.4
Launceston (Ti Tree Bend) 16.6 = 16.6 in 1980 26 15.7
Scamander 18.7 17.7 in 1980 24 16.5
Tarraleah Village 13.5 12.3 in 1999 24 11.0
Wynyard Airport 16.6 16.2 in 2003 23 14.9
Fingal (Legge Street) 16.9 16.8 in 1999 22 15.2
Geeveston (Cemetery Road) 16.5 15.7 in 1999 21 14.5


Highest May mean daily maximum temperature for at least 20 years
Mean daily maximum
temperature
for May 2007 (°C)
Most recent higher
for May
Years since
higher
Normal for
May
Burnie (Round Hill) 16.6 16.9 in 1974 33 15.3
Launceston Airport Comparison 15.2 15.5 in 1980 27 14.0
Maatsuyker Island Lighthouse 14.6 14.8 in 1980 27 12.7
Flinders Island Airport 17.6 17.7 in 1980 26 16.2



Record highest May daily minimum temperature

Highest daily minimum
temperature
in May 2007 (°C)
Previous highest
for May
Years of
record
Normal for
May
Mount Wellington 10.2 on the 12th 9.7 on the 5th in 1972 28 0.4




Record highest May mean daily minimum temperature

Mean daily minimum
temperature
for May 2007 (°C)
Previous highest
for May
Years of
record
Normal for
May
Hobart (Ellerslie Road) 10.0 9.4 in 1999 125 6.9
Cape Bruny Lighthouse 10.5 10.3 in 1939 83 8.2
Grove (Comparison) 7.6 6.9 in 1973 52 4.2
Swansea Post Office 9.0 8.9 in 1988 51 6.2
Hobart Airport 9.3 8.9 in 1988 49 6.5
Orford (Aubin Court) 8.9 8.8 in 1988 39 6.2
Strathgordon Village 7.6 7.3 in 1980 37 5.4
Marrawah 11.2 10.8 in 1988 36 9.0
Bicheno (Council Depot) 10.7 9.8 in 1988 33 8.4
Mount Wellington 3.1 2.4 in 1999 28 0.4
Launceston (Ti Tree Bend) 8.8 7.7 in 1980 26 5.0
Scamander 10.1 9.2 in 1980 24 7.5
Wynyard Airport 7.1 6.8 in 1999 23 5.0
Geeveston (Cemetery Road) 7.6 7.0 in 1999 21 4.4

Highest May mean daily minimum temperature for at least 20 years

Mean daily minimum
temperature
for May 2007 (°C)
Most recent higher
for May
Years since
higher
Normal for
May
Maatsuyker Island Lighthouse 10.3 10.6 in 1980 27 8.4



Summaries

In this table, key sites have been highlighted to make them easier to find. This table is very wide and may not fit if printed.


Summary statistics for May 2007
Maximum temperatures
for May
(°C)
Minimum temperatures
for May
(°C)
Rainfall
for May
(millimetres)
Mean for
May
2007
Diff
from
normal
Highest for
May
2007
Mean for
May
2007
Diff
from
normal
Lowest for
May
2007
Total for
May
2007
Normal
for
May
Rank of
May
2007
Fraction of
May
normal
Northern (district 91)
Bridport 16.7 +0.9 19.1 15th 10.0 +2.3 5.7 22nd 155.5 66.8 very high 233%
Burnie 16.6 +1.4 20.0 11th 10.6 +2.3 6.6 23rd 175.2 94.8 very high 185%
Cape Grim BAPS 15.9 +1.4 18.2 16th 11.9 +1.9 7.9 30th 139.0 77.0 high 181%
Cressy Research Station 15.5 19.7 15th 7.2 0.7 7th 100.6
Devonport Airport 16.4 +1.3 18.0 3rd 9.8 +3.2 4.7 22nd 117.8 76.1 high 155%
Launceston 16.6 +0.9 20.0 15th 8.8 +3.8 3.9 7th 140.6 64.5 highest 218%
Launceston Airport 15.8 19.9 15th 7.2 2.8 23rd 120.0
Launceston Airport Comparison 15.2 +1.2 18.8 15th 7.6 +3.1 2.5 7th 128.6 60.8 very high 212%
Low Head 16.6 +1.4 18.4 3rd 11.7 +2.5 8.0 7th 99.6 55.7 high 179%
Luncheon Hill 14.1 +1.1 19.3 14th 8.6 +1.8 4.5 30th 310.0 168.5 very high 184%
Marrawah 15.9 +1.2 18.2 15th 11.2 +2.1 7.5 7th 156.4 104.3 high 150%
Powranna 15.5 +1.1 19.0 15th 6.6 +2.7 0.5 7th 93.7 45.9 very high 204%
Scottsdale 15.7 +0.8 19.0 15th 8.1 +2.3 3.5 10th 207.4 103.0 highest 201%
Sheffield School Farm 14.5 +1.0 19.9 11th 7.5 +2.1 3.3 7th
Smithton Aerodrome 16.7 +1.4 19.0 16th 8.9 +3.0 2.6 7th 167.2 84.5 very high 198%
Wynyard Airport 16.6 +1.7 20.1 11th 7.1 +2.1 2.6 23rd 216.4 99.4 very high 218%
East Coast (district 92)
Bicheno 19.0 +2.6 21.7 26th 10.7 +2.4 7.5 7th 19.4 56.5 low 34%
Eddystone Point 17.8 +2.1 21.2 17th 11.4 +1.7 6.8 22nd 84.0 67.0 high 125%
Fingal 16.9 +1.8 20.8 15th 5.6 +2.8 −0.2 12th 57.8 50.3 high 115%
Friendly Beaches 18.0 +2.2 21.1 11th 10.3 +2.3 7.1 15th
Lake Leake 13.5 +2.3 19.2 11th 4.6 +2.5 −1.2 15th 105.2 74.2 high 142%
Maria Island 17.6 20.9 11th 11.7 8.6 22nd 12.8
Orford 17.6 +1.9 21.8 15th 8.9 +2.8 4.8 7th 29.2 58.9 normal 50%
Scamander 18.7 +2.2 20.8 26th 10.1 +2.6 6.8 10th 52.1 55.4 normal 94%
St Helens Aerodrome 17.9 21.8 15th 9.6 6.1 10th 62.4
Swan Island 17.1 19.3 3rd 12.4 8.3 22nd 176.8
Swansea Post Office 18.2 +2.4 21.4 15th 9.0 +2.9 4.8 15th 10.0 46.7 low 21%
Midlands (district 93)
Ross 16.0 +1.9 20.8 29th 7.0 +3.8 −0.2 7th 62.8 26.8 very high 234%
Southeast (district 94)
Bull Bay 17.3 +2.3 22.0 26th 9.6 +1.6 5.5 22nd 25.0 38.7 low 65%
Campania 18.4 22.4 15th 8.5 3.8 12th 25.2
Cape Bruny 16.4 +2.3 20.2 26th 10.6 +2.1 6.3 22nd 36.4 53.0 low 69%
Cape Bruny Lighthouse 16.2 +2.8 19.6 26th 10.5 +2.3 6.4 22nd 49.0 84.4 low 58%
Dover 16.4 +1.8 21.4 15th 8.6 +2.8 2.6 22nd 56.0 71.8 normal 78%
Geeveston 16.5 +2.0 20.2 15th 7.6 +3.2 1.5 22nd 86.6 71.8 high 121%
Grove 17.2 +2.7 20.0 3rd 7.6 +3.3 0.9 22nd 35.0 59.9 normal 58%
Grove 17.2 20.0 3rd 7.3 0.3 22nd 36.6
Hobart 17.3 +2.9 20.9 11th 10.0 +3.1 5.1 22nd 31.2 46.8 normal 67%
Hobart Airport 18.0 +2.9 22.0 11th 9.3 +2.8 5.1 22nd 16.8 34.9 low 48%
Maatsuyker Island Lighthouse 14.6 +1.9 18.2 1st 10.3 +2.0 6.7 22nd 160.4 115.8 high 139%
Melton Mowbray 16.7 +2.6 21.3 15th 7.1 +2.9 1.7 15th 34.0 25.9 high 131%
Mount Wellington 8.4 +2.9 14.9 11th 3.1 +2.7 −1.5 31st 42.0 63.9 low 66%
Tasman Island 15.5 20.0 15th 10.4 6.9 31st 18.6
Tunnack Fire Station 14.7 +2.5 19.7 11th 6.6 +3.1 1.8 14th 44.4 41.4 normal 107%
Derwent Valley (district 95)
Bushy Park 17.1 +2.9 21.7 26th 6.0 +2.0 0.6 22nd
Maydena Post Office 14.7 +1.7 19.0 17th 6.6 +2.5 2.4 7th 150.0 98.9 high 152%
Moogara 13.6 +2.7 18.6 15th 6.1 +2.1 2.0 31st 64.6 60.4 normal 107%
Ouse Fire Station 16.8 20.6 26th 5.8 −0.1 12th 45.0
Tarraleah Village 13.5 +2.6 18.9 15th 4.3 +2.0 −1.3 7th 112.6 103.0 high 109%
Central Plateau (district 96)
Lake St Clair National Park 12.1 +1.9 17.3 15th 3.6 +2.1 −1.7 7th 295.6 171.4 high 172%
Liawenee 11.1 20.1 11th 2.5 −1.6 7th 184.8
West Coast (district 97)
Hartz Mountain 10.2 +1.6 17.7 14th 5.2 +1.9 0.5 30th 97.4
Mount Read 8.4 +2.0 14.0 11th 3.7 +1.6 −0.7 30th 593.2 413.9 high 143%
Scotts Peak Dam 13.1 17.8 1st 7.3 3.7 22nd 226.8
Strahan Aerodrome 15.6 +1.4 22.1 15th 10.1 +2.8 6.7 22nd 253.6 136.0 very high 186%
Strathgordon Village 17.0 27th 7.6 +2.2 3.2 22nd 410.0 242.8 high 169%
Warra 13.0 17.8 15th 6.9 2.4 22nd 224.4
King Island (district 98)
King Island Airport 16.9 +1.5 20.5 14th 11.6 +2.6 6.8 13th 127.4 86.4 high 147%
Flinders Island (district 99)
Flinders Island Airport 17.6 +1.5 20.7 15th 11.4 +2.5 5.4 14th 139.2 80.9 high 172%
Hogan Island 17.0 19.3 16th 12.8 6.8 22nd 75.4
Macquarie Island (district 300)
Macquarie Island 6.6 +0.7 9.1 4th 3.0 +0.5 −3.7 16th 119.2 83.6 very high 143%


Notes

This statement has been prepared based on information available at 10 am on Friday 1 June 2007. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Normals 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 "normal" 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, normal in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of normal shows how much rain has fallen this time as a percentage of the long-term mean.

Further information

Tom Delfatti
Tasmania and Antarctica Climate Services Centre
Bureau of Meteorology
Phone (03) 6221 2043
Email climate.tas@bom.gov.au