Victoria in May 2013:

Rainfall slightly less than that usually received

Highlights:

  • Overnight temperatures near to those in most years
  • Daytime temperatures slightly warmer than those in most years
  • Rainfall slightly less than that in most years

Summary

Bureau of Meteorology data show that across the State of Victoria, overnight minimum temperatures were near to those usually experienced (average departure from normal -0.3 °C). Daytime maximum temperatures at most localities were slightly warmer than those registered in the past (average departure from normal 0.9 °C). Total rainfall for the month was generally slightly less than that usually recorded (average percentage of normal received 68.7%).

Over the northern plains, minimum temperatures were slightly cooler than those usually experienced (average departure from normal -0.7 °C). Daytime maximum temperatures at most localities were slightly warmer than those registered in the past (average departure from normal 0.5 °C). Total rainfall for the month was generally slightly less than that usually recorded (average percentage of normal received 77.5%).

In southern districts, minimum temperatures were near to those usually experienced (average departure from normal -0.1 °C). Daytime maximum temperatures at most localities were slightly warmer than those registered in the past (average departure from normal 0.8 °C). Total rainfall for the month was generally less than that usually recorded, although a persistent low pressure system gave heavy rainfall to the southwest coastal district (average percentage of normal received 57.9%).

Details

In the Mallee, overnight minimum temperatures were near to those usually experienced (average departure from normal 0.4 °C). Daytime maximum temperatures at most localities were warmer than those registered in the past (average departure from normal 1.2 °C). Total rainfall for the month was generally close to that usually recorded (average percentage of normal received 100.5%).

In the Wimmera, overnight minimum temperatures were slightly cooler than those usually experienced (average departure from normal -0.8 °C). Daytime maximum temperatures at most localities were near to those registered in the past (average departure from normal 0.4 °C). Total rainfall for the month was generally less than that usually recorded (average percentage of normal received 60.5%).

In the Northern Country, overnight minimum temperatures were near to those usually experienced (average departure from normal -0.2 °C). Daytime maximum temperatures at most localities were slightly warmer than those registered in the past (average departure from normal 0.7 °C). Total rainfall for the month was generally slightly less than that usually recorded (average percentage of normal received 75.5%).

In Victoria's North Central District, overnight minimum temperatures were cooler than those usually experienced (average departure from normal -1.2 °C). Daytime maximum temperatures at most localities were slightly warmer than those registered in the past (average departure from normal 0.8 °C). Total rainfall for the month was generally less than that usually recorded (average percentage of normal received 59%).

In the North East District, overnight minimum temperatures were cooler than those usually experienced (average departure from normal -1.2 °C). Daytime maximum temperatures at most localities were near to those registered in the past (average departure from normal 0 °C). Total rainfall for the month was generally slightly less than that usually recorded (average percentage of normal received 87%).

In East Gippsland, overnight minimum temperatures were slightly warmer than those usually experienced (average departure from normal 0.5 °C). Daytime maximum temperatures at most localities were slightly warmer than those registered in the past (average departure from normal 0.6 °C). Total rainfall for the month was generally much less than that usually recorded (average percentage of normal received 33%).

In West Gippsland, overnight minimum temperatures were near to those usually experienced (average departure from normal -0.2 °C). Daytime maximum temperatures at most localities were slightly warmer than those registered in the past (average departure from normal 0.8 °C). Total rainfall for the month was generally less than that usually recorded (average percentage of normal received 53.5%).

In the Central District, overnight minimum temperatures were near to those usually experienced (average departure from normal -0.3 °C). Daytime maximum temperatures at most localities were warmer than those registered in the past (average departure from normal 1 °C). Total rainfall for the month was generally slightly less than that usually recorded (average percentage of normal received 65.7%).

In the Western District, overnight minimum temperatures were near to those usually experienced (average departure from normal -0.4 °C). Daytime maximum temperatures at most localities were slightly warmer than those registered in the past (average departure from normal 0.8 °C). Total rainfall for the month was generally slightly less than that usually recorded (average percentage of normal received 75.5%).

Melbourne climate summary for the month of May 2013

Rainfall slightly less than that usually received.

Located in the Central District at the head of Port Phillip Bay, Melbourne is Victoria's State Capital. Here, overnight minimum temperatures were warmer than those usually experienced and averaged 9.8 °C (departure from normal 1.1 °C). That the overnight temperatures in Melbourne are higher than those in most surrounding localities is a consequence of the city being under the influence of the effect of urbanisation (cities are usually warmer than their rural surroundings, especially at night, because of heat stored in bricks and concrete and trapped between close-packed buildings). Daytime maximum temperatures were warmer than those usually experienced and averaged 18.1 °C (departure from normal 1.4 °C). Total rainfall for the month was 36.6 mm, this being slightly less than that usually recorded (normal 55.9 mm, percentage of normal received 65%).

Records

Some sites had their highest total May rainfall on record.

Some sites had their highest total May rainfall for at least 10 years.

Some sites had their lowest total May rainfall on record.

Some sites had their lowest total May rainfall for at least 10 years.

Some sites had their highest May daily rainfall on record.

Some sites had their highest May temperature on record.

Some sites had their highest May mean daily maximum temperature on record.

Some sites had their lowest May mean daily minimum temperature on record.

Some sites had their lowest May mean daily minimum temperature for at least 10 years.


Extremes in May 2013
Hottest day 28.7 °C at Port Fairy AWS on the 9th
Warmest days on average 20.3 °C at Mildura Airport
Coolest days on average 4.5 °C at Mount Hotham
Coldest day -2.1 °C at Mount Hotham on the 14th
Coldest night -5.8 °C at Mount Hotham on the 2nd
Coolest nights on average -0.6 °C at Mount Hotham
Warmest nights on average 11.9 °C at Wilsons Promontory Lighthouse
Warmest night 18.4 °C at Cape Otway Lighthouse on the 9th
Warmest on average overall 14.5 °C at Cape Nelson Lighthouse
Coolest on average overall 2.0 °C at Mount Hotham
Wettest overall 282.9 mm at Falls Creek (Rocky Valley)
Wettest day 81.6 mm at Falls Creek (Rocky Valley) on the 16th
Highest wind gust 119 km/h at Wilsons Promontory Lighthouse on the 4th

Record highest May daily rainfall
Highest daily rainfall
in May 2013 (mm)
Previous wettest
for May
Years of
record
Port Fairy AWS 47.2 on the 15th 29.8 on the 29th in 2007 19
Cudgewa Ck @ Berringama 22.8 on the 31st 20.0 on the 29th in 2010 13
Major Creek @ Graytown 44.6 on the 17th 23.2 on the 30th in 2007 13
Ovens River at Bright 37.2 on the 31st 33.8 on the 30th in 2007 13
Kanagulk 26.6 on the 13th 20.4 on the 26th in 2009 10
Longwarry North (Bunyip River @ Longwarr 37.0 on the 17th 29.4 on the 4th in 2012 10
Ovens River @ Eurobin 39.2 on the 31st 39.0 on the 25th in 2012 10



Record highest total May rainfall
Total rainfall
for May 2013 (mm)
Previous wettest
for May
Years of
record
Average for
May
Port Fairy AWS 142.6 139.0 in 2007 19 66.5
Porepunkah (Buckland River at Harris Lan 130.2 123.6 in 2007 13 69.0

Highest total May rainfall for at least 10 years
Total rainfall
for May 2013 (mm)
Most recent May
at least this wet
Years since
wetter
Average for
May
Cape Otway Lighthouse 142.6 152.0 in 2000 13 90.7
Dartmouth Reservoir 95.0 218.0 in 2000 13 85.5
Hawkesdale (Post Office) 97.0 104.8 in 2000 13 65.5
Hunters Hill 134.6 261.6 in 2000 13 86.8
Koetong 113.2 223.4 in 2000 13 93.9
Nariel Creek (Simpson) 115.8 191.6 in 2000 13 89.0
Nullawarre 134.8 179.5 in 2000 13 89.4
Burrowye Station 91.6 126.6 in 2000* 11 68.6
Gellibrand River Forestry 104.8 126.8 in 2000* 11 95.9

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported.




Record lowest total May rainfall
Total rainfall
for May 2013 (mm)
Previous driest
for May
Years of
record
Average for
May
Swifts Creek 3.6 = 3.6 in 1976 74 41.3
Lima South (Lake Nillahcootie) 3.4 3.6 in 2005 46 86.5
Simpson South 12.6 26.3 in 1996 45 94.8
Glen Waverley (Golf Course) 7.8 16.0 in 2009 40 71.5
Acheron River @ Taggerty 0.2 1.0 in 2003 18 50.1
Balook (Mount Tassie) 0.0 38.2 in 2001 13 79.5
Campaspe River @ Redesdale 0.0 2.4 in 2009 13 30.4
Dargo River @ Lower Dargo Road 0.0 3.2 in 2002 13 21.9
Mitchell River @ Glenaladale 9.2 12.0 in 2003 13 35.9
Tanjil River @ Tanjil South 0.2 7.8 in 2007 13 48.9
Benwerrin 21.4 27.8 in 2005 12 72.5
Boonah 12.0 24.0 in 2005 12 62.1
Bairnsdale (Mitchell River @ Rosehill) 11.6 11.8 in 2005 11 33.1
Loddon River @ D/S Laanecoorie 6.2 9.6 in 2006 10 27.6
Weeragua (Cann River (East Branch) at Ch 4.2 7.8 in 2007 10 55.5

Lowest total May rainfall for at least 10 years
Total rainfall
for May 2013 (mm)
Most recent May
at least this dry
Years since
drier
Average for
May
Meredith 14.2 6.6 in 1959* 53 57.4
Dargo 9.4 8.6 in 1965* 47 49.6
Tubbut 4.8 2.0 in 1976* 36 42.9
Lake Tyers 17.2 14.8 in 1993* 15 69.4
East Sale Airport 12.2 10.0 in 2003 10 51.5

* note: there are gaps in the historical record at this site, so it is possible a lower value has gone unreported.




Record highest May temperature
Highest temperature
in May 2013 (°C)
Previous warmest
for May
Years of
record
Average for
May
Portland (Cashmore Airport) 26.8 on the 9th = 26.8 on the 4th in 1990 31 15.8
Phillip Island Penguin Reserve 25.1 on the 9th 24.7 on the 8th in 2002 28 16.7
Cranbourne Botanic Gardens 25.4 on the 9th 25.2 on the 1st in 1997 24 16.3
Aireys Inlet 27.3 on the 9th 25.9 on the 8th in 2002 22 16.1
Cerberus 25.6 on the 9th 25.5 on the 8th in 2002 22 16.5
Mortlake Racecourse 27.9 on the 9th 27.3 on the 7th in 2002 22 16.1
Port Fairy AWS 28.7 on the 9th 28.0 on the 8th in 2002 22 16.7
Cape Nelson Lighthouse 28.3 on the 9th 27.2 on the 4th in 2005 17 16.0
Warrnambool Airport NDB 27.9 on the 9th 27.0 on the 8th in 2002 15 16.5
Colac (Mount Gellibrand) 26.3 on the 9th 25.0 on the 8th in 2002 13 15.0



Record highest May mean daily maximum temperature
Mean daily maximum
temperature
for May 2013 (°C)
Previous warmest
for May
Years of
record
Average for
May
Cape Nelson Lighthouse 17.6 17.5 in 2007 16 16.0



Record lowest May mean daily minimum temperature
Mean daily minimum
temperature
for May 2013 (°C)
Previous coolest
for May
Years of
record
Average for
May
Cerberus 7.4 = 7.4 in 2003 21 8.3

Lowest May mean daily minimum temperature for at least 10 years
Mean daily minimum
temperature
for May 2013 (°C)
Most recent May
at least this cool
Years since
cooler
Average for
May
Morwell (Latrobe Valley Airport) 5.0 3.4 in 1984 29 6.5
Bairnsdale Airport 5.5 =5.5 in 2003 10 6.7



Summary statistics for May 2013
Maximum temperatures
for May
(°C)
Minimum temperatures
for May
(°C)
Rainfall
for May
(millimetres)
Mean for
May
2013
Diff
from
average
Highest for
May
2013
Mean for
May
2013
Diff
from
average
Lowest for
May
2013
Total for
May
2013
Average
for
May
Rank of
May
2013
Fraction of
May
average
Southwest Slopes (South) (district 72)
Albury Airport AWS 17.2 -0.4 24.2 12th 4.4 -0.9 -0.2 25th 45.0 47.6 average 95%
Hume Reservoir 17.0 +0.3 24.0 12th 6.7 -0.3 1.3 25th 60.0 58.5 average 103%
North Mallee (district 76)
Mildura Airport 20.3 +1.3 28.5 8th 7.8 +0.4 1.9 3rd 28.0 25.1 average 112%
Ouyen (Post Office) 19.9 +1.1 28.0 8th 7.6 +0.4 2.9 3rd 29.5 31.6 average 93%
South Mallee (district 77)
Hopetoun Airport 19.0   27.6 9th 5.8   -0.9 2nd 16.2
Swan Hill Aerodrome 19.3 +0.6 26.0 8th 6.1 +0.1 0.1 3rd 16.0 24.8 average 65%
North Wimmera (district 78)
Nhill Aerodrome 18.0   27.9 9th 6.9   0.5 2nd 27.0 23.9 average 113%
Warracknabeal Museum 18.0 +0.1 26.8 9th 6.3 -0.2 0.5 2nd 30.3 39.2 average 77%
South Wimmera (district 79)
Edenhope Airport 17.7   27.8 9th 7.2   0.0 2nd 32.4
Grampians (Mount William) 8.9   17.2 9th 3.8   0.5 14th 105.4
Horsham Aerodrome 17.8 +0.2 26.8 9th 4.8 -0.2 -1.7 5th 21.4 30.7 average 70%
Kanagulk 17.3   26.2 9th 5.9   -0.9 2nd 46.4 31.9 high 145%
Longerenong 17.7 +0.6 26.6 9th 5.5 -0.4 -1.1 5th 25.4 42.6 average 60%
Pyrenees (Ben Nevis) 12.0   20.9 9th 5.7   2.2 14th 46.2
Stawell Aerodrome 16.4 +0.1 24.2 9th 6.2 +0.2 1.4 2nd 24.2 34.7 average 70%
Lower North (district 80)
Charlton 18.1   25.5 9th 6.2   1.3 2nd 32.6
Echuca Aerodrome 18.4 +0.8 24.9 11th 5.6 -1.0 1.4 29th 24.1 40.4 average 60%
Kerang 19.0 +1.0 26.0 11th 6.7 0.0 2.3 28th 25.2 35.9 average 70%
Kyabram 18.0 +0.8 24.7 12th 5.9 -0.1 1.2 24th 20.8 41.5 average 50%
Upper North (district 81)
Bendigo Airport 16.9 +0.3 23.5 11th 4.7 -0.4 -0.1 2nd 39.6 45.4 average 87%
Shepparton Airport 17.5 -0.1 23.8 10th 5.0 -0.3 0.4 6th 30.6 31.0 average 99%
Tatura Inst Sustainable Ag 17.5 +0.3 23.5 10th 4.6 -1.1 -0.1 6th 23.8 44.4 average 54%
Yarrawonga 17.8 -0.3 24.6 11th 5.2 -0.7 -0.4 25th 29.2 31.0 average 94%
Lower Northeast (district 82)
Benalla Airport 17.5   24.7 10th 3.7   -1.0 25th 35.7
Corryong Airport 15.5   21.2 11th 2.0   -3.3 25th 74.4
Dartmouth Reservoir 15.4 -0.6 22.6 10th 3.9 -0.7 -0.3 25th 95.0 85.5 average 111%
Hunters Hill 11.7 -0.1 20.2 10th 5.3 -0.2 1.6 19th 134.6 86.8 high 155%
Rutherglen Research 17.3 +0.3 24.6 11th 2.2 -2.1 -3.4 5th 51.4 51.1 average 101%
Strathbogie 14.3 -0.2 21.2 10th 3.3 -0.2 -2.2 24th 70.2 95.5 average 74%
Wangaratta Aero 17.0 -0.5 24.0 10th 2.7 -1.5 -2.0 5th 52.8 57.6 average 92%
Upper Northeast (district 83)
Dinner Plain (Mount Hotham Airport) 10.4 -0.3 17.6 10th 0.6 -0.1 -4.7 6th 30.4 35.8 average 85%
Falls Creek 5.8 -0.3 14.3 10th 0.2 -0.4 -3.9 5th 115.8 89.5 high 129%
Mount Buller 5.8 -0.5 13.5 10th 0.6 -0.5 -3.9 2nd 129.4 131.0 average 99%
Mount Hotham 4.5 -0.1 12.8 10th -0.6 -0.5 -5.8 2nd 150.4 119.9 average 125%
Omeo 14.6   22.6 10th 1.1   -4.8 25th 7.8
East Gippsland (district 84)
Combienbar AWS 15.0 +0.9 24.4 11th 7.8 +0.2 4.0 6th 30.0 66.7 low 45%
Gabo Island Lighthouse 17.5 +0.6 21.7 9th 11.3 +0.1 8.1 3rd 30.4 99.3 low 31%
Gelantipy 13.2 +0.4 20.2 10th 4.4 -0.4 -0.4 6th 9.4 48.9 v low 19%
Lakes Entrance (Eastern Beach Road) 17.9   24.2 3rd 7.8   3.4 3rd 29.2
Mallacoota 17.7 +0.3 22.8 11th 9.5 +0.2 5.1 15th 41.6 83.9 low 50%
Mount Nowa Nowa 16.4 +0.7 25.5 11th 9.0 +0.4 5.3 25th 15.4 61.6 v low 25%
Orbost 18.4 +0.9 25.1 11th 7.9 -0.5 4.2 14th 25.2 55.0 low 46%
Point Hicks (Lighthouse) 17.4 +0.5 22.7 12th 11.2 +0.2 7.9 15th 81.4 95.9 average 85%
West Gippsland (district 85)
Bairnsdale Airport 18.1 +0.6 25.9 9th 5.5 -1.2 0.3 22nd 16.0 46.3 low 35%
East Sale Airport 17.5 +0.7 25.6 9th 5.0 -1.3 -0.4 3rd 12.2 51.5 v low 24%
Morwell (Latrobe Valley Airport) 17.1 +0.3 25.5 9th 5.0 -1.5 -0.3 3rd 47.4 53.5 average 89%
Mount Baw Baw 5.5 -1.0 15.1 10th 0.9 -0.6 -3.2 2nd 145.2 119.6 average 121%
Pound Creek 17.5   25.7 11th 6.8   0.3 24th 73.4
Willow Grove (Blue Rock Reservoir) 16.7 +0.7 24.4 11th 6.9 -0.6 3.0 24th 47.4 52.5 average 90%
Wilsons Promontory Lighthouse 16.0 +1.1 22.9 9th 11.9 +0.8 9.0 14th 95.2 112.8 average 84%
Yarram Airport 17.9   26.5 9th 5.9   -0.7 3rd 37.2
East Central (district 86)
Bundoora (Latrobe University) 17.3 +0.7 24.9 9th 7.4 -0.5 2.0 23rd 25.2 51.4 low 49%
Cerberus 17.2 +0.7 25.6 9th 7.4 -0.9 1.5 22nd 85.2 69.5 average 123%
Coldstream 17.4 +1.0 24.8 10th 4.3 -1.1 -2.3 6th 60.2 64.7 average 93%
Coldstream Comparison 17.4   24.8 10th 4.2   -2.4 6th 60.0
Cranbourne Botanic Gardens 17.1 +0.8 25.4 9th 7.8 -0.6 3.0 24th 76.9 64.6 high 119%
Essendon Airport 17.7 +1.6 25.9 9th 8.2 +0.5 2.2 28th 32.2 49.2 average 65%
Ferny Creek 13.5   21.4 9th 8.0   3.4 6th 95.0
Frankston AWS 16.6 +0.7 24.7 9th 10.2 -0.3 4.7 24th
Melbourne Airport 17.7 +1.1 26.2 9th 8.0 -0.3 2.1 6th 25.6 40.0 average 64%
Melbourne Regional Office 18.1 +1.4 25.5 9th 9.8 +1.1 4.9 24th 36.6 55.9 low 65%
Moorabbin Airport 17.8 +0.9 25.9 9th 7.9 -0.7 1.7 6th 47.0 70.2 low 67%
Phillip Island Penguin Reserve 16.9 +0.2 25.1 9th 8.3 -0.6 1.3 24th 78.1 70.6 average 111%
Rhyll 16.8 +0.6 23.5 11th 10.4 -0.3 7.0 22nd 91.4 73.7 average 124%
Scoresby Research Institute 17.3 +1.1 24.9 9th 7.7 -0.5 1.4 6th 62.6 88.3 low 71%
Viewbank 17.6 +0.6 25.1 9th 7.5 -0.2 0.9 23rd 38.8 52.1 low 74%
Wallan (Kilmore Gap) 13.4 +0.7 20.4 10th 7.0 +0.2 3.1 14th 28.0 57.4 low 49%
Wonthaggi 17.4 +0.8 25.1 9th 8.2 -0.4 3.0 7th 112.4 98.2 average 114%
West Central (district 87)
Avalon Airport 18.4 +1.3 26.1 8th 6.9 -0.6 1.7 29th 25.0 35.4 average 71%
Breakwater (Geelong Racecourse) 18.1   25.6 11th 7.7   3.3 29th 31.0
Laverton RAAF 18.0 +1.2 27.2 9th 7.9 +0.2 2.2 6th 30.8 46.6 average 66%
Sheoaks 16.6 +1.2 25.9 9th 6.9 -0.3 0.7 24th 30.4 32.8 average 93%
North Central (district 88)
Castlemaine Prison 16.2 +0.5 23.2 9th 5.0 -0.2 -1.5 5th 27.4 56.2 low 49%
Eildon Fire Tower 13.6 +0.4 21.7 10th 6.8 +0.3 3.1 6th 36.0 55.0 low 65%
Lake Eildon 16.7 +0.6 23.6 11th 5.1 -0.8 -0.5 6th 53.4 78.5 average 68%
Mangalore Airport 17.4 +0.7 24.2 11th 4.7 -1.3 -0.4 3rd 31.0 54.2 low 57%
Maryborough 16.9 +0.7 24.0 9th 5.1 -1.0 0.7 19th 30.6 49.1 average 62%
Redesdale 16.5 +0.5 22.6 10th 3.9 -1.2 -0.6 5th 45.0 55.9 average 81%
Western Plains (district 89)
Ararat Prison 16.3 +0.9 24.2 9th 5.2 -0.3 -2.5 2nd 41.2 51.9 average 79%
Ballarat Aerodrome 14.6 +1.0 21.9 9th 4.8 -0.9 -2.5 2nd 41.4 64.5 low 64%
Westmere 16.4   25.4 9th 5.2   -1.9 6th 49.6
West Coast (district 90)
Aireys Inlet 17.4 +1.3 27.3 9th 10.2 +0.4 7.1 14th 36.6 50.3 average 73%
Cape Nelson Lighthouse 17.6 +1.6 28.3 9th 11.3 +0.5 6.1 2nd 114.6 68.6 high 167%
Cape Otway Lighthouse 16.5 +0.9 26.1 9th 11.2 +1.2 7.6 14th 142.6 90.7 v high 157%
Casterton 17.2   27.5 9th 7.1   0.0 2nd 53.2
Colac (Mount Gellibrand) 16.4 +1.4 26.3 9th 8.2 +0.4 4.7 21st 51.2 38.3 high 134%
Dartmoor 17.4   27.9 9th 7.4   -0.1 2nd 107.8
Hamilton Airport 16.5 +0.8 25.6 9th 6.5 0.0 0.6 2nd 50.6 49.3 average 103%
Mortlake Racecourse 17.2 +1.1 27.9 9th 7.0 +0.5 -1.7 2nd 60.8 49.0 high 124%
Port Fairy AWS 18.1 +1.4 28.7 9th 9.3 +0.2 3.8 2nd 142.6 66.5 highest 214%
Portland (Cashmore Airport) 16.9 +1.1 26.8 9th 8.7 +0.4 1.7 2nd 108.8 78.7 high 138%
Portland NTC AWS 17.1   25.6 9th 10.9   5.2 2nd
Warrnambool Airport NDB 17.5 +1.0 27.9 9th 8.0 +0.8 1.3 2nd 87.6 67.0 high 131%

Notes

A Monthly Climate Summary is prepared to list the main features of the weather in Victoria using the most timely and accurate information available on the date of publication; it will generally not be updated. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.

This statement has been prepared based on information available at 1 pm on Monday 3 June 2013. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

Averages 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.

The ACORN-SAT dataset is being used for temperature area averages from December 2012 onwards. The major change from earlier datasets is that the ACORN-SAT dataset commences in 1910, rather than 1950, and hence rankings are calculated using a larger set of years.

 


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