Tuesday, 1 May 2018 - Monthly Climate Summary for Western Australia - Product code IDCKGC11R0

Western Australia in April 2018: Second-warmest April on record

Warmer than average conditions were observed throughout much of Western Australia during April 2018, with daytime temperatures ranking as second-highest on record. A number of sites in the Kimberley and Pilbara recorded their warmest April on record, while sites in the Kimberley, Pilbara, Goldfields and Eucla broke their highest April daily temperature records. Rainfall was below average through much of the Southwest Land Division (SWLD).

Second-warmest April on record

  • Above to very much above average daytime temperatures were reported throughout much of Western Australia during April 2018, apart from in the southwest which saw near average conditions.
  • Average across the state as a whole, mean daily maximum temperatures were 2.99 °C above average and ranked as the second-highest on record behind April 1981.
  • Numerous sites in the Pilbara and Kimberley reported their highest April mean daily maximum temperature on record
  • Conditions were particularly hot during the first week of the month in the Pilbara and Kimberley where temperatures reached the low forties and several sites broke their highest April temperature on record
  • The heat extended into the southeast of the state, with temperatures exceeding 40 °C in the Eucla District on the 9th; Forrest and Eucla observed their highest April temperature on record
  • The 42.0 °C reported at Eucla on the 9th was its highest April temperature in 100 years of record
  • Further information on this heat event is available in the Special Climate Statement 65 - persistent summer-like heat sets many April records
  • Minimum temperatures were above to very much above average through the Pilbara, north and east Gascoyne, Goldfields, Southern Interior, Eucla and in southern parts of the SWLD; below average minimum temperatures were confined to patches in the Kimberley and coastal Gascoyne while the remainder of the state was near average.
  • Averaged across the state as a whole, the mean daily minimum temperature was 1.18 °C above average and ranked as the ninth-highest on record.
  • High overnight temperaters were recorded in the Pilbara in the first two weeks of April and some sites had their warmest April night (highest daily minimum temperature) on record
  • A few Pilbara sites recorded had their highest April mean daily minimum temperature on record

Below average rainfall in the southwest

  • Rainfall was below average through much of the SWLD and isolated areas of the remainder of the State with some sites in the Pilbara, Central West, South and Southeast Coastal districts observing their lowest total April rainfall in more than 20 years
  • Morawa Airport recorded no rainfall for the month, its lowest April total rainfall in 22 years of record
  • Patches of above average rainfall were observed in parts of the Kimberley and east Pilbara, with the remainder of the state generally near average or below
  • Averaged across the state, rainfall was 63% below average and the lowest since 1994
  • A moderate cold front moved across the SWLD on the 22nd, bringing the first significant rain of the season, with totals of 20 mm to 40 mm reported the Southwest District.
  • Thunderstorms associated with the front on the 22nd caused power outages for up to 7000 properties with the most affected areas Kelmscott, Woodvale, Kingsley and Sawyers Valley.

Tropical Cyclones

Further information

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Extremes Maps Records Summaries Important notes the top

Extremes in April 2018
Hottest day 43.7 °C at Roebourne Aero on the 3rd
Warmest days on average 40.0 °C at Fitzroy Crossing Aero
Coolest days on average 21.1 °C at Shannon
Coldest day 14.2 °C at Manjimup on the 19th
Coldest night 0.5 °C at Eyre on the 26th
Coolest nights on average 8.9 °C at Jarrahwood
Warmest nights on average 28.3 °C at Bedout Island
Warmest night 30.1 °C at Thevenard Island on the 6th
Warmest on average overall 31.4 °C at Bedout Island
31.4 °C at Mardie
Coolest on average overall 16.1 °C at Shannon
Wettest overall 72.4 mm at Ferguson Valley
Wettest day 58.2 mm at Siddins Creek on the 1st
Strongest wind gust 89 km/h at Cape Leeuwin on the 9th
89 km/h at Wiluna Aero on the 19th
89 km/h at Forrest on the 22nd

Extremes Maps Records Summaries Important notes the top

Maps
ObservedAnomalyDecile rank
Total
rainfall		 Map of Rainfall totals Map of Percentage of normal rainfall Map of Rainfall deciles
Mean
daily
maximum
temperatures		 Map of Mean maximum temperature Map of Anomaly in mean maximum temperature Map of Decile rank of mean maximum temperature
Mean
daily
minimum
temperatures		 Map of Mean minimum temperature Map of Anomaly in mean minimum temperature Map of Decile rank of mean minimum temperature

Click on a map to show it full size in a pop-up window

Record lowest April total rainfall
New record
(mm)		 Old
record		 Years of
record		 Average for
April
Morawa Airport 0.0 0.6 in 1998 22 17.7

Lowest April total rainfall for at least 20 years
Observed
(mm)		 Most recent
lower		 Average for
April
Wongan Hills 0.4 0.0 in 1950 22.4
Mettler 9.1 8.4 in 1993 52.6
Paraburdoo Aero 0.2 0.0 in 1994* 24.8
Jacup 7.8 4.0 in 1995* 41.0
Bremer Bay 11.9 10.0 in 1993* 50.3

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



Record highest April temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
April
Eucla 42.0 on the 9th 41.1 on the 3rd in 1938 100 23.6
Port Hedland Airport 42.8 on the 7th 42.5 on the 4th in 2016 70 35.2
Learmonth Airport 42.5 on the 6th 41.8 on the 4th in 2016 44 33.2
Kununurra Aero 40.1 on the 2nd 40.0 on the 11th in 1990 33 35.3
Laverton Aero 38.1 on the 7th 38.0 on the 4th in 2016 27 26.7
Forrest 40.9 on the 9th 39.4 on the 1st in 2005 26 26.2
Pardoo Station 42.5 on the 7th = 42.5 on the 14th in 2005 24 35.5
Thevenard Island 40.2 on the 5th 39.7 on the 17th in 2005 23 31.9
Fitzroy Crossing Aero 42.1 on the 2nd 41.6 on the 5th in 2010 21 36.7
Barrow Island Airport 38.2 on the 5th 38.1 on the 3rd in 2016 20 31.2
Varanus Island 36.7 on the 4th 35.2 on the 16th in 2016 20 31.2


Record highest April mean daily maximum temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
April
Port Hedland Airport 38.9 38.4 in 2016 69 35.2
Wittenoom 37.6 36.7 in 2016 64 33.2
Onslow Airport 38.2 37.7 in 2016 51 33.8
Learmonth Airport 37.2 35.9 in 2016 43 33.2
Kununurra Aero 37.7 37.5 in 2016 32 35.3
Doongan 35.7 = 35.7 in 2002 29 33.2
Karratha Aero 37.1 36.8 in 2016 24 34.3
Argyle Aerodrome 38.1 37.5 in 2016 23 35.0
Pardoo Station 38.8 37.9 in 2016 23 35.5
Paraburdoo Aero 37.2 36.4 in 2016 22 33.5
Thevenard Island 35.6 33.9 in 2016 22 31.9
Newman Aero 36.2 35.6 in 2005 21 31.8
Fitzroy Crossing Aero 40.0 39.2 in 2016 20 36.7

Highest April mean daily maximum temperature for at least 20 years
Observed
(°C)		 Most recent
higher		 Average for
April
Wiluna 33.4 34.2 in 1981* 29.2
Kalgoorlie-Boulder Airport 28.1 =28.1 in 1994 25.2

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



Record highest April daily minimum temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
April
Wittenoom 29.7 on the 5th = 29.7 on the 4th in 1986 65 21.2
Learmonth Airport 27.7 on the 4th 27.6 on the 14th in 1981 44 20.4
Thevenard Island 30.1 on the 6th 28.4 on the 2nd in 2017 23 24.3
Barrow Island Airport 29.2 on the 6th 28.9 on the 3rd in 2009 20 24.6
Varanus Island 29.4 on the 11th 29.1 on the 3rd in 2009 20 26.0


Record highest April mean daily minimum temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
April
Onslow Airport 23.8 23.5 in 2013 51 21.4
Thevenard Island 25.8 25.5 in 1996 22 24.3


Record highest April mean temperature
New record
(°C)		 Old
record		 Years of
record		 Average for
April
Port Hedland Airport 31.0 = 31.0 in 2005 69 28.3
Mardie 31.4 31.3 in 2016 62 28.5
Onslow Airport 31.0 30.5 in 2016 51 27.6
Learmonth Airport 29.1 28.4 in 2005 43 26.8
Karratha Aero 30.9 30.7 in 2005 24 28.5
Argyle Aerodrome 31.1 31.0 in 2016 23 28.9
Paraburdoo Aero 29.3 = 29.3 in 2016 22 26.6
Thevenard Island 30.7 29.6 in 2016 21 28.1

Highest April mean temperature for at least 20 years
Observed
(°C)		 Most recent
higher		 Average for
April
Eucla 20.5 21.6 in 1981* 18.5

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



Extremes Maps Records Summaries Important notes the top

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
North Kimberley (district 01)
Doongan 35.7 +2.5 37.5 9th 18.8 -0.2 11.0 30th 2.0 46.7 low 4%
Kalumburu 36.4 +1.6 38.5 3rd 21.7 +0.6 15.0 30th 63.8 36.0 high 177%
Troughton Island 33.7 +0.9 35.7 17th 28.0 +1.1 26.3 18th 0 29.3 lowest 0%
Truscott 34.0 +0.6 35.4 24th 24.6 +0.5 21.7 30th 46.4 74.5 average 62%
Wyndham Aero 38.7 +2.0 41.0 2nd 23.5 +0.1 15.5 30th 22.8 26.3 average 87%
East Kimberley (district 02)
Argyle Aerodrome 38.1 +3.1 40.3 2nd 24.1 +1.2 18.5 30th 7.2 25.1 average 29%
Halls Creek Airport 36.9   38.9 2nd 18.3   12.8 30th 0.8
Kununurra Aero 37.7 +2.4 40.1 2nd 21.0 -0.9 14.0 30th 31.0 30.7 average 101%
Warmun 36.3 +1.1 40.2 6th 19.3 -1.3 15.1 18th 13.0 25.1 average 52%
West Kimberley (district 03)
Broome Airport 36.3 +2.0 39.5 23rd 23.3 +0.6 19.1 29th 1.4 25.5 average 5%
Curtin Aero 37.5 +1.1 39.6 6th 21.7 -0.6 15.6 29th 0.8 39.2 low 2%
Cygnet Bay 34.3 +0.7 35.9 23rd         4.1 40.7 average 10%
Fitzroy Crossing Aero 40.0 +3.3 42.1 2nd 20.4 -0.3 15.8 28th 2.8 28.1 low 10%
De Grey (district 04)
Bedout Island 34.4   36.9 17th 28.3   26.3 30th
Karratha Aero 37.1 +2.8 40.9 3rd 24.8 +2.1 21.3 17th 7.2 17.3 average 42%
Legendre Island 34.4   38.1 23rd 26.8   24.8 18th
Mandora 38.0 +1.9 41.6 3rd 21.5 +0.7 18.2 25th 1.6 19.1 average 8%
Marble Bar 38.8 +2.7 41.4 3rd 22.3 +0.3 17.9 17th 18.8 21.8 average 86%
Pardoo Station 38.8 +3.3 42.5 7th 22.0 +0.4 17.5 19th 0 19.5 lowest 0%
Port Hedland Airport 38.9 +3.7 42.8 7th 23.1 +1.6 19.4 18th 0.4 21.8 average 2%
Roebourne Aero 39.3 +3.2 43.7 3rd 23.0 +1.3 18.3 17th 0.8 8.7 average 9%
Fortescue (district 05)
Barrow Island Airport 34.0 +2.8 38.2 5th 26.0 +1.4 22.2 30th 0.2 33.7 low 1%
Learmonth Airport 37.2 +4.0 42.5 6th 21.0 +0.6 17.0 26th 0 17.6 lowest 0%
Mardie 39.1 +3.3 42.9 5th 23.4 +2.3 19.1 29th 0 19.3 lowest 0%
Onslow Airport 38.2 +4.4 42.6 6th 23.8 +2.4 19.9 30th 0 11.4 lowest 0%
Thevenard Island 35.6 +3.7 40.2 5th 25.8 +1.5 22.5 7th 0 18.3 lowest 0%
Wittenoom 37.6 +4.4 40.8 4th 23.4 +2.2 19.8 15th 1.0 27.7 low 4%
West Gascoyne (district 06)
Carnarvon Airport 30.4 +1.2 37.6 4th 19.6 +0.4 14.2 29th 0 13.1 lowest 0%
Denham 27.6 -1.1 35.0 29th 18.3 -1.5 16.0 12th 0 13.7 lowest 0%
Murchison 33.0 +2.1 39.0 3rd 16.1 -0.2 12.0 12th 2.2 20.8 low 11%
Shark Bay Airport 32.2 +1.2 38.9 2nd 18.1 -0.3 12.6 29th 0.4 8.7 low 5%
East Gascoyne (district 07)
Newman Aero 36.2 +4.4 40.1 4th 19.5 +2.1 13.4 30th 1.8 21.8 low 8%
Paraburdoo Aero 37.2 +3.7 40.9 4th 21.2 +1.5 16.9 18th 0.2 24.8 v low 1%
Murchison (district 07A)
Meekatharra Airport 32.2 +2.9 38.3 7th 18.0 +0.9 14.1 12th 10.2 18.9 average 54%
Mount Magnet Aero 31.1 +2.3 36.1 6th 16.6 +0.3 10.6 12th 1.6 18.1 low 9%
Paynes Find 29.8 +1.4 35.8 3rd 13.6 -0.6 8.2 11th 0.2 25.2 low 1%
North Coast (district 08)
Dalwallinu 27.8 +0.8 35.9 3rd 12.5 -0.8 7.0 11th 2.4 13.3 low 18%
Geraldton Airport 28.7   35.6 16th 13.7   9.2 11th 0.2
Kalbarri 29.9 +0.4 35.5 2nd 15.4 -0.9 7.2 11th 0.6 19.3 low 3%
Morawa Airport 29.9 +1.0 38.5 3rd 14.1 -0.4 7.5 11th 0 17.7 lowest 0%
Mullewa 30.1 +1.3 38.0 3rd 15.2 +0.1 9.1 11th 1.0 21.4 low 5%
North Island 26.2 -0.1 31.2 29th 19.9 -0.5 13.1 20th 0 16.4 v low 0%
Wongan Hills 27.7 +1.3 35.6 3rd 12.5 -0.9 7.5 11th 0.4 22.4 v low 2%
Central Coast (district 09)
Badgingarra Research Stn 27.8 +0.6 35.4 16th 12.9 -0.7 6.2 19th 2.8 27.1 v low 10%
Bickley 23.5 -0.1 31.4 3rd 12.8 +0.1 9.2 14th 39.8 55.3 average 72%
Garden Island HSF 23.6 -0.2 31.0 16th 16.6 +0.6 11.7 26th 31.8 38.0 average 84%
Gingin Aero 27.5 +0.8 35.7 16th 12.0 -0.1 5.4 14th 13.2 27.7 low 48%
Jandakot Aero 25.9 +0.1 33.0 16th 13.1 +0.6 6.7 14th 30.8 41.6 average 74%
Jurien Bay 26.3 -0.1 34.3 29th 14.1 +0.1 8.8 19th 9.4 29.7 low 32%
Lancelin 25.2 -0.3 33.3 16th 15.0 +0.5 10.7 14th 18.2 30.9 low 59%
Millendon (Swan Valley) 27.2   35.3 3rd 12.6   6.8 11th 23.0
Pearce RAAF 27.6 +1.2 35.5 3rd 12.6 -0.8 6.2 11th 16.6 34.5 low 48%
Perth Airport 26.5 +0.9 33.6 3rd 13.2 +0.2 7.2 14th 10.0 40.1 low 25%
Perth Metro 26.1 +0.2 33.1 16th 14.1 +0.3 8.6 15th 20.6 35.7 average 58%
Rottnest Island 23.6 -0.1 30.8 16th 17.4 +0.1 14.9 15th 26.2 33.9 average 77%
Swanbourne 24.8 -0.6 33.2 16th 15.9 +0.7 11.7 14th 32.8 39.4 average 83%
South Coast (district 09A)
Albany 21.2 +0.3 29.5 29th 14.1 +1.3 11.0 20th 54.2 68.7 average 79%
Albany Airport 22.6   30.1 29th 11.7   7.7 26th 21.8
Bridgetown 23.3 -0.1 31.9 3rd 9.3 0.0 4.9 15th 40.8 48.7 average 84%
Bunbury 24.2 0.0 30.4 2nd 12.2 +0.4 5.9 25th 14.4 36.4 low 40%
Busselton Aero 23.6 -0.4 29.6 2nd 11.7 +0.7 6.3 25th 18.8 33.2 average 57%
Cape Leeuwin 21.4 +0.1 28.8 29th 16.0 +0.5 12.9 10th 36.0 58.9 average 61%
Cape Naturaliste 23.3 +1.4 28.6 2nd 14.3 +0.4 10.9 15th 0.4 43.0 v low 1%
Collie East 23.7 -0.1 32.5 3rd         29.0 42.9 low 68%
Donnybrook 24.4 +0.3 32.5 3rd 11.6 +1.2 7.1 25th 49.8 49.6 average 100%
Dwellingup 23.4 +0.9 30.9 3rd 11.5 +1.2 6.1 14th 42.8 65.5 average 65%
Esperance 24.4 +1.2 33.4 17th 14.1 +0.8 9.1 12th 3.8 44.6 v low 9%
Esperance Aero 25.0 +1.5 32.8 17th 12.7 0.0 8.0 12th 6.8 38.9 v low 17%
Hopetoun North 23.8 +0.6 32.0 30th 13.6 +1.1 8.4 21st 4.8 35.7 v low 13%
Jarrahwood 24.0 +0.2 33.0 3rd 8.9 +0.2 2.6 15th 49.4 48.4 average 102%
Mandurah 24.0 -0.1 31.0 2nd 16.3 +0.5 12.4 11th 22.6 39.2 average 58%
Manjimup 22.0 +0.9 30.0 3rd 11.1 +0.3 7.3 10th 38.8 59.3 average 65%
North Walpole 21.7 +0.3 29.4 29th 13.1 +0.3 6.7 10th 27.0 83.0 v low 33%
Rocky Gully 21.8 -0.1 30.3 3rd 11.1 +0.2 5.6 10th 27.0 51.5 average 52%
Shannon 21.1 -0.4 28.8 3rd 11.1 +0.3 5.4 10th 55.2 65.8 average 84%
Windy Harbour 21.4 -0.6 29.8 29th 11.8 -0.4 6.8 28th 70.6 68.1 average 104%
Witchcliffe 22.4 -0.2 29.5 16th 11.8 +0.7 7.9 26th 39.0 62.7 average 62%
North Central (district 10)
Bencubbin 26.6 +0.8 33.7 3rd 12.8 0.0 6.3 11th 0 22.4 lowest 0%
Cunderdin Airfield 27.4 +0.9 35.7 3rd 11.4 -0.7 5.7 11th 6.6 23.8 low 28%
Merredin 26.7 +1.2 33.5 3rd 12.9 0.0 6.4 11th 1.4 22.8 v low 6%
Northam 27.1 +1.0 35.7 3rd 11.0 -1.0 4.5 11th 4.1 23.3 low 18%
York 27.1 +0.8 35.0 3rd 10.1 -0.8 4.0 11th 4.6 21.6 low 21%
South Central (district 10A)
Beverley 27.0 +0.9 34.8 3rd 11.4 +0.1 5.6 21st 9.8 23.3 average 42%
Brookton 25.6 +0.6 33.7 3rd 10.7 -0.5 4.5 13th 6.9 25.8 low 27%
Hyden 26.5 +0.8 33.3 3rd 11.3 +0.2 4.1 14th 7.2 23.3 low 31%
Jacup 23.7 +0.7 32.0 3rd 10.5 -0.3 6.9 11th 7.8 41.0 v low 19%
Katanning 23.4 +0.1 32.0 3rd 11.4 +0.3 8.1 20th 0 28.8 v low 0%
Lake Grace 24.7 +0.4 31.8 3rd 12.3 +0.4 7.4 25th 2.6 24.2 low 11%
Narembeen 26.9 +1.0 34.2 3rd 12.5 +0.5 6.9 13th 10.2 23.1 average 44%
Narrogin 24.2 +1.1 32.5 3rd 11.6 +1.1 6.5 14th 11.0 29.3 low 38%
Newdegate Research Station 24.7 +0.5 31.6 3rd 10.7 +0.5 4.9 25th 5.2 26.2 low 20%
Pingelly 24.9 +0.8 33.0 3rd 10.7 -1.1 5.6 14th 9.0 26.9 low 33%
Ravensthorpe 24.8 +1.1 32.0 4th 12.4 +0.6 8.0 13th 13.4 32.6 average 41%
Wagin 24.0 +0.3 32.8 3rd 11.7 +0.9 6.8 26th 11.2 28.6 average 39%
Wandering 24.7 +0.2 33.5 3rd 10.1 +0.6 3.9 14th 18.0 29.9 average 60%
Eucla (district 11)
Eucla 26.1 +2.5 42.0 9th 14.9 +1.5 9.7 12th 4.6 26.5 low 17%
Eyre 25.9 +1.7 35.2 22nd 12.1 +0.4 0.5 26th 5.2 24.6 low 21%
Forrest 29.3 +3.1 40.9 9th 13.0 +1.0 7.4 26th 1.4 17.1 v low 8%
Red Rocks Point 24.6 +0.9 36.5 9th 15.0 +0.7 9.2 12th 3.8 24.3 v low 16%
South East (district 12)
Bulga Downs 31.5 +3.0 37.8 7th 14.5 +0.3 7.8 12th
Kalgoorlie-Boulder Airport 28.1 +2.9 36.0 7th 13.5 +0.8 7.7 12th 11.4 20.3 average 56%
Laverton Aero 30.8 +4.1 38.1 7th 15.8 +0.9 9.1 13th 6.6 19.5 low 34%
Leinster Aero 31.7 +4.0 38.2 7th 16.5 +1.2 9.1 12th 7.0 24.6 low 28%
Leonora Aero 31.0 +3.3 39.2 7th 15.6 +0.4 7.8 12th 3.4 15.9 v low 21%
Munglinup West 24.5 +0.2 32.4 17th 12.3 +0.2 8.0 11th 10.4 32.5 v low 32%
Norseman Aero 27.4 +2.2 34.5 7th 11.5 +0.6 6.2 20th 24.0 24.3 average 99%
Salmon Gums Res.Stn. 25.8 +2.0 32.6 7th 10.6 +0.7 3.7 20th 3.0 26.7 v low 11%
Southern Cross Airfield 27.2 +1.0 32.8 4th 11.9 +0.2 5.5 12th 12.8 22.9 average 56%
North East (district 13)
Carnegie 34.1 +4.0 40.3 9th 17.5 +1.4 11.5 13th 2.8 22.6 low 12%
Giles Meteorological Office 33.2 +3.8 38.1 1st 18.5 +2.1 11.8 15th 13.0 18.0 average 72%
Telfer Aero 37.0 +2.5 40.5 2nd 21.6 +1.0 15.7 30th 0 18.8 lowest 0%
Wiluna 33.4 +4.2 39.5 8th 17.4 +2.3 11.0 15th 1.7 28.6 low 6%
Wiluna Aero 33.1   39.8 8th 17.0   11.4 17th 1.6
Offshore Islands (district 200)
Adele Island 31.8   32.7 20th     20.0 30th
Browse Island 31.4   32.8 20th     23.0 30th
Rowley Shoals 31.2   33.5 29th     27.3 1st
Varanus Island 33.4 +2.2 36.7 4th 27.9 +1.9 26.2 30th 0.2 35.7 average 1%

Extremes Maps Records Summaries Important notes the top

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Western Australia 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.

This statement has been prepared based on information available at 11 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

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