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Weather Records on 31 May 1909

8 weather records were set or tied worldwide on 31 May 1909. Highest significance: San Diego Wbo, US.

Key Facts for 31 May 1909

  • On 31 May 1909, 8 weather records were set or tied at long-record stations worldwide.
  • 8 were record highs and 0 were record lows, counting maximum and minimum temperature.
  • By timescale, 0 were all-time records, 0 monthly and 8 daily.
  • San Diego Wbo set a daily record high minimum temperature of 18.9 C (66.0 F) on 31 May 1909.
  • Across 161 earlier years (1811 to 2026) the same calendar date averaged 440 records.

Record Map

8 stations
Weather records on 31 May 1909 8 station records on 31 May 1909 are marked on the map, coloured by record type.
8 station records on 31 May 1909 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.
Weather records on 31 May 1909: highest significance records shown on the map
StationCountryTypeValueSignificance
San Diego WboUnited StatesRecord high minimum temperature18.9 C (66.0 F)23 of 100 (Routine)
Cape Otway LighthouseAustraliaRecord high minimum temperature15.6 C (60.1 F)21 of 100 (Routine)
Deniliquin (Wilkinson St)AustraliaRecord high minimum temperature9.7 C (49.5 F)16 of 100 (Routine)
Melbourne Regional OfficeAustraliaRecord high minimum temperature12.7 C (54.9 F)9 of 100 (Routine)
Winnipeg St Johns CollCanadaRecord high maximum temperature28.3 C (82.9 F)7 of 100 (Routine)
EscanabaUnited StatesRecord high minimum temperature13.3 C (55.9 F)3 of 100 (Routine)
Alice Springs Post OfficeAustraliaRecord high minimum temperature15.6 C (60.1 F)2 of 100 (Routine)
Sacramento 5 ESEUnited StatesRecord high maximum temperature34.4 C (93.9 F)2 of 100 (Routine)

Counts by Type and Timescale

8 records
Records on 31 May 1909 by type Records set or tied on 31 May 1909 by type: Highest daily maximum 2, Highest daily minimum 6. 0246Highest daily maximum: 2Lowest daily maximum: 0Highest daily minimum: 6Lowest daily minimum: 0Heaviest daily rainfall: 0Heaviest daily snowfall: 0Deepest snow cover: 0Max highMax lowMin highMin lowRainSnowDepth
Records set or tied on 31 May 1909 by type: Highest daily maximum 2, Highest daily minimum 6.
Records on 31 May 1909 by type
Record typeRecords
Highest daily maximum2
Lowest daily maximum0
Highest daily minimum6
Lowest daily minimum0
Heaviest daily rainfall0
Heaviest daily snowfall0
Deepest snow cover0
Records on 31 May 1909 by timescale Records on 31 May 1909 by timescale: all-time 0, monthly 0, daily 8. 02468all-time: 0monthly: 0daily: 8all-timemonthlydaily
Records on 31 May 1909 by timescale: all-time 0, monthly 0, daily 8.
Records on 31 May 1909 by timescale
TimescaleRecords
all-time0
monthly0
daily8

How Much Records Were Beaten By

5 broken records
Histogram of margins by which records were beaten on 31 May 1909 Margins by which the 5 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 2.3. Ties are not counted. 011220.0 to 0.5: 10.5 to 1.0: 21.0 to 1.5: 01.5 to 2.0: 02.0 to 2.5: 20.0 to 0.50.5 to 1.01.0 to 1.51.5 to 2.02.0 to 2.5
Margins by which the 5 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 2.3. Ties are not counted.
Histogram of margins by which records were beaten on 31 May 1909
MarginRecords
0.0 to 0.51
0.5 to 1.02
1.0 to 1.50
1.5 to 2.00
2.0 to 2.52

Top 20 by Significance

31 May 1909
Top 8 records on 31 May 1909 by significance
DateStationRecordValueBeat old record byOld record stoodSignificance
31 May 1909San Diego Wbo, USdaily high min18.9 C (66.0 F)2.2 C (4.0 F)29 years23 of 100 (Routine)
31 May 1909Cape Otway Lighthouse, AUdaily high min15.6 C (60.1 F)2.3 C (4.1 F)23 years21 of 100 (Routine)
31 May 1909Deniliquin (Wilkinson St), AUdaily high min9.7 C (49.5 F)0.3 C (0.5 F)38 years16 of 100 (Routine)
31 May 1909Melbourne Regional Office, AUdaily high min12.7 C (54.9 F)0.6 C (1.1 F)7 years9 of 100 (Routine)
31 May 1909Winnipeg St Johns Coll, CAdaily high max28.3 C (82.9 F)0.5 C (0.9 F)15 years7 of 100 (Routine)
31 May 1909Escanaba, USdaily high min (Tie)13.3 C (55.9 F)tie31 years3 of 100 (Routine)
31 May 1909Alice Springs Post Office, AUdaily high min (Tie)15.6 C (60.1 F)tie25 years2 of 100 (Routine)
31 May 1909Sacramento 5 ESE, USdaily high max (Tie)34.4 C (93.9 F)tie16 years2 of 100 (Routine)

Significance is a score from 0 to 100 combining margin, the age of the old record and the length of the station's record. How it is computed.

The Same Date in Other Years

1811 to 1909
Records on 05-31 in each year Records set or tied on this calendar date in each year from 1811 to 1909. 1909 had 8 records. 01,0002,0003,0001811: 11818: 31827: 11836: 21845: 11847: 11853: 21855: 21858: 11864: 21865: 11866: 11867: 11868: 41869: 11871: 21873: 31874: 11877: 11878: 21879: 21880: 31882: 11883: 11885: 11888: 11889: 21890: 11892: 11893: 41894: 21895: 81897: 51898: 71899: 11900: 21901: 91902: 91903: 171904: 191905: 71906: 111907: 201908: 121909: 81910: 261911: 201912: 151913: 831914: 201915: 231916: 231917: 131918: 201919: 441920: 461921: 1571922: 491923: 981924: 1521925: 2261926: 2281927: 1211928: 671929: 2461930: 6121931: 2231932: 1811933: 3971934: 7821935: 1561936: 5591937: 4621938: 4241939: 4611940: 3831941: 4101942: 3641943: 5521944: 3721945: 4571946: 3801947: 4391948: 2951949: 3031950: 4671951: 6401952: 3741953: 6541954: 4451955: 5341956: 6321957: 3041958: 4291959: 4591960: 2471961: 4721962: 5651963: 3541964: 1,2371965: 4941966: 6011967: 9871968: 2761969: 5551970: 5731971: 7141972: 1,1271973: 4181974: 4731975: 7971976: 4351977: 6051978: 8731979: 9151980: 5171981: 7751982: 8171983: 1,4941984: 2,0471985: 7901986: 1,3651987: 8221988: 1,2551989: 9121990: 9001991: 1,3811992: 1,0311993: 9821994: 7761995: 6931996: 9461997: 1,1631998: 1,2151999: 7902000: 1,1722001: 1,0472002: 1,1622003: 8312004: 1,0712005: 7242006: 1,0452007: 7932008: 8092009: 5702010: 7412011: 1,4982012: 7642013: 1,1002014: 5652015: 7042016: 4022017: 4402018: 1,2112019: 4202020: 6732021: 8342022: 9022023: 4542024: 8092025: 1,2042026: 5361811187418991916193319501967198420012018
Records set or tied on this calendar date in each year from 1811 to 1909. 1909 had 8 records.
Counts for years before the ledger starts come from the same station rules.
Records on 05-31 in each year
YearRecords
18111
18183
18271
18362
18451
18471
18532
18552
18581
18642
18651
18661
18671
18684
18691
18712
18733
18741
18771
18782
18792
18803
18821
18831
18851
18881
18892
18901
18921
18934
18942
18958
18975
18987
18991
19002
19019
19029
190317
190419
19057
190611
190720
190812
19098
191026
191120
191215
191383
191420
191523
191623
191713
191820
191944
192046
1921157
192249
192398
1924152
1925226
1926228
1927121
192867
1929246
1930612
1931223
1932181
1933397
1934782
1935156
1936559
1937462
1938424
1939461
1940383
1941410
1942364
1943552
1944372
1945457
1946380
1947439
1948295
1949303
1950467
1951640
1952374
1953654
1954445
1955534
1956632
1957304
1958429
1959459
1960247
1961472
1962565
1963354
19641,237
1965494
1966601
1967987
1968276
1969555
1970573
1971714
19721,127
1973418
1974473
1975797
1976435
1977605
1978873
1979915
1980517
1981775
1982817
19831,494
19842,047
1985790
19861,365
1987822
19881,255
1989912
1990900
19911,381
19921,031
1993982
1994776
1995693
1996946
19971,163
19981,215
1999790
20001,172
20011,047
20021,162
2003831
20041,071
2005724
20061,045
2007793
2008809
2009570
2010741
20111,498
2012764
20131,100
2014565
2015704
2016402
2017440
20181,211
2019420
2020673
2021834
2022902
2023454
2024809
20251,204
2026536

Download the Data

  • Data for records on 1909-05-31: CSV or JSON. Field meanings are on the data page.

Sources: Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Made with Natural Earth. Public domain map data. Borders are Natural Earth's de facto depiction. Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-15).