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Built 2026-10-19 (19 October 2026)

Weather Records on 15 August 1909

30 weather records were set or tied worldwide on 15 August 1909. Highest significance: Riversdale, ZA.

Key Facts for 15 August 1909

  • On 15 August 1909, 30 weather records were set or tied at long-record stations worldwide.
  • 20 were record highs and 4 were record lows, counting maximum and minimum temperature.
  • By timescale, 0 were all-time records, 0 monthly and 30 daily.
  • Riversdale set a daily record precipitation of 15.2 mm (0.6 in) on 15 August 1909.
  • Across 168 earlier years (1793 to 2026) the same calendar date averaged 457 records.

Record Map

30 stations
Weather records on 15 August 1909 30 station records on 15 August 1909 are marked on the map, coloured by record type.
30 station records on 15 August 1909 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.
Weather records on 15 August 1909: highest significance records shown on the map
StationCountryTypeValueSignificance
RiversdaleSouth AfricaRecord daily precipitation15.2 mm (0.6 in)20 of 100 (Routine)
PeterboroughCanadaRecord daily precipitation16.5 mm (0.6 in)17 of 100 (Routine)
DalhousieCanadaRecord high maximum temperature28.3 C (82.9 F)17 of 100 (Routine)
La Crosse Wb CityUnited StatesRecord high maximum temperature32.8 C (91.0 F)17 of 100 (Routine)
Ilulissat (Jakobshavn)Greenland [Denmark]Record daily precipitation13.4 mm (0.5 in)16 of 100 (Routine)
SpringbokSouth AfricaRecord daily precipitation15.7 mm (0.6 in)16 of 100 (Routine)
Dublin Phoenix ParkIrelandRecord high minimum temperature15.4 C (59.7 F)15 of 100 (Routine)
Dubuque RiverUnited StatesRecord high minimum temperature23.3 C (73.9 F)15 of 100 (Routine)
Port StanleyCanadaRecord high minimum temperature21.1 C (70.0 F)14 of 100 (Routine)
Daly WatersAustraliaRecord daily precipitation0.5 mm (0.02 in)13 of 100 (Routine)
Philadelphia CityUnited StatesRecord low minimum temperature16.1 C (61.0 F)12 of 100 (Routine)
GrahamstownSouth AfricaRecord daily precipitation17.0 mm (0.7 in)11 of 100 (Routine)
Port ArthurCanadaRecord high minimum temperature15.0 C (59.0 F)10 of 100 (Routine)
BeatriceCanadaRecord high minimum temperature17.8 C (64.0 F)10 of 100 (Routine)
Milwaukee Wb CityUnited StatesRecord high maximum temperature31.7 C (89.1 F)10 of 100 (Routine)
Parry SoundCanadaRecord high minimum temperature18.3 C (64.9 F)9 of 100 (Routine)
Olympia Priest Pt ParkUnited StatesRecord low minimum temperature5.0 C (41.0 F)9 of 100 (Routine)
Dubuque RiverUnited StatesRecord high maximum temperature33.3 C (91.9 F)9 of 100 (Routine)
Toledo BladeUnited StatesRecord high minimum temperature21.7 C (71.1 F)6 of 100 (Routine)
KarlsruheGermanyRecord high minimum temperature19.0 C (66.2 F)5 of 100 (Routine)
Middletown 4 WUnited StatesRecord low minimum temperature8.3 C (46.9 F)5 of 100 (Routine)
Augsburg (Sankt Stephan)GermanyRecord high minimum temperature16.2 C (61.2 F)4 of 100 (Routine)
WoodstockCanadaRecord high minimum temperature17.2 C (63.0 F)2 of 100 (Routine)
Montgomery Wb CityUnited StatesRecord high minimum temperature25.0 C (77.0 F)2 of 100 (Routine)
Madison Wb CityUnited StatesRecord high maximum temperature31.1 C (88.0 F)2 of 100 (Routine)
SouthamptonCanadaRecord high minimum temperature18.3 C (64.9 F)1 of 100 (Routine)
LakefieldCanadaRecord high minimum temperature18.3 C (64.9 F)1 of 100 (Routine)
EscanabaUnited StatesRecord high minimum temperature17.8 C (64.0 F)1 of 100 (Routine)
Chattanooga Wb CityUnited StatesRecord high minimum temperature23.3 C (73.9 F)1 of 100 (Routine)
Winnemucca APUnited StatesRecord low minimum temperature4.4 C (39.9 F)0 of 100 (Routine)

Counts by Type and Timescale

30 records
Records on 15 August 1909 by type Records set or tied on 15 August 1909 by type: Highest daily maximum 5, Highest daily minimum 15, Lowest daily minimum 4, Heaviest daily rainfall 6. 051015Highest daily maximum: 5Lowest daily maximum: 0Highest daily minimum: 15Lowest daily minimum: 4Heaviest daily rainfall: 6Heaviest daily snowfall: 0Deepest snow cover: 0Max highMax lowMin highMin lowRainSnowDepth
Records set or tied on 15 August 1909 by type: Highest daily maximum 5, Highest daily minimum 15, Lowest daily minimum 4, Heaviest daily rainfall 6.
Records on 15 August 1909 by type
Record typeRecords
Highest daily maximum5
Lowest daily maximum0
Highest daily minimum15
Lowest daily minimum4
Heaviest daily rainfall6
Heaviest daily snowfall0
Deepest snow cover0
Records on 15 August 1909 by timescale Records on 15 August 1909 by timescale: all-time 0, monthly 0, daily 30. 0102030all-time: 0monthly: 0daily: 30all-timemonthlydaily
Records on 15 August 1909 by timescale: all-time 0, monthly 0, daily 30.
Records on 15 August 1909 by timescale
TimescaleRecords
all-time0
monthly0
daily30

How Much Records Were Beaten By

22 broken records
Histogram of margins by which records were beaten on 15 August 1909 Margins by which the 22 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 8.1. Ties are not counted. 0510150 to 2: 142 to 4: 54 to 6: 16 to 8: 18 to 10: 10 to 22 to 44 to 66 to 88 to 10
Margins by which the 22 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 8.1. Ties are not counted.
Histogram of margins by which records were beaten on 15 August 1909
MarginRecords
0 to 214
2 to 45
4 to 61
6 to 81
8 to 101

Top 20 by Significance

15 August 1909
Top 20 records on 15 August 1909 by significance
DateStationRecordValueBeat old record byOld record stoodSignificance
15 August 1909Riversdale, ZAdaily rain15.2 mm (0.6 in)6.8 mm (0.27 in)17 years20 of 100 (Routine)
15 August 1909Peterborough, CAdaily rain16.5 mm (0.6 in)1.3 mm (0.05 in)40 years17 of 100 (Routine)
15 August 1909Dalhousie, CAdaily high max28.3 C (82.9 F)2.7 C (4.9 F)24 years17 of 100 (Routine)
15 August 1909La Crosse Wb City, USdaily high max32.8 C (91.0 F)2.8 C (5.0 F)24 years17 of 100 (Routine)
15 August 1909Ilulissat (Jakobshavn), GLdaily rain13.4 mm (0.5 in)4.0 mm (0.16 in)18 years16 of 100 (Routine)
15 August 1909Springbok, ZAdaily rain15.7 mm (0.6 in)8.1 mm (0.32 in)3 years16 of 100 (Routine)
15 August 1909Dublin Phoenix Park, IEdaily high min15.4 C (59.7 F)0.4 C (0.7 F)33 years15 of 100 (Routine)
15 August 1909Dubuque River, USdaily high min23.3 C (73.9 F)2.7 C (4.9 F)16 years15 of 100 (Routine)
15 August 1909Port Stanley, CAdaily high min21.1 C (70.0 F)1.1 C (2.0 F)30 years14 of 100 (Routine)
15 August 1909Daly Waters, AUdaily rain0.5 mm (0.02 in)0.5 mm (0.02 in)35 years13 of 100 (Routine)
15 August 1909Philadelphia City, USdaily low min16.1 C (61.0 F)0.6 C (1.1 F)23 years12 of 100 (Routine)
15 August 1909Grahamstown, ZAdaily rain17.0 mm (0.7 in)3.0 mm (0.12 in)20 years11 of 100 (Routine)
15 August 1909Port Arthur, CAdaily high min15.0 C (59.0 F)0.6 C (1.1 F)21 years10 of 100 (Routine)
15 August 1909Beatrice, CAdaily high min17.8 C (64.0 F)1.7 C (3.1 F)11 years10 of 100 (Routine)
15 August 1909Milwaukee Wb City, USdaily high max31.7 C (89.1 F)2.8 C (5.0 F)4 years10 of 100 (Routine)
15 August 1909Parry Sound, CAdaily high min18.3 C (64.9 F)1.6 C (2.9 F)8 years9 of 100 (Routine)
15 August 1909Olympia Priest Pt Park, USdaily low min5.0 C (41.0 F)0.6 C (1.1 F)15 years9 of 100 (Routine)
15 August 1909Dubuque River, USdaily high max33.3 C (91.9 F)1.1 C (2.0 F)13 years9 of 100 (Routine)
15 August 1909Toledo Blade, USdaily high min21.7 C (71.1 F)0.6 C (1.1 F)8 years6 of 100 (Routine)
15 August 1909Karlsruhe, DEdaily high min19.0 C (66.2 F)0.4 C (0.7 F)4 years5 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

1793 to 1909
Records on 08-15 in each year Records set or tied on this calendar date in each year from 1793 to 1909. 1909 had 30 records. 05001,0001,5002,0001793: 21802: 11805: 11812: 11821: 11838: 21839: 11841: 11844: 11845: 31852: 11854: 11856: 11858: 11861: 31867: 11868: 21869: 11873: 21875: 11876: 21877: 11878: 11879: 11880: 31881: 21882: 21883: 11884: 21885: 31886: 11887: 11888: 31890: 21891: 21892: 31893: 31895: 11896: 91897: 31898: 11899: 21900: 61901: 51902: 101903: 51904: 171905: 261906: 81907: 141908: 151909: 301910: 161911: 261912: 341913: 421914: 111915: 261916: 2231917: 321918: 231919: 221920: 591921: 551922: 861923: 1161924: 2201925: 911926: 1151927: 2231928: 2711929: 5861930: 2741931: 3511932: 3681933: 2681934: 9921935: 4141936: 8671937: 5741938: 6811939: 4501940: 3721941: 2891942: 3771943: 4261944: 6101945: 4331946: 2851947: 5591948: 3661949: 5591950: 3171951: 5971952: 5961953: 4491954: 4811955: 5391956: 3901957: 3551958: 1,0921959: 5151960: 4171961: 7041962: 1,0521963: 9721964: 1,1851965: 5351966: 3401967: 6871968: 1,0021969: 5831970: 3821971: 8991972: 6131973: 4991974: 5121975: 4901976: 1,3451977: 5501978: 8411979: 1,7881980: 7451981: 5881982: 4791983: 9551984: 6221985: 9151986: 1,2831987: 1,0981988: 1,4791989: 4951990: 7581991: 7781992: 1,6381993: 8311994: 1,0731995: 1,2981996: 9291997: 9271998: 8611999: 9562000: 9322001: 1,2542002: 1,3072003: 1,2482004: 1,4242005: 1,0672006: 9232007: 1,3172008: 9642009: 1,0382010: 1,6222011: 7702012: 6542013: 7112014: 5832015: 7592016: 7072017: 5322018: 3282019: 4352020: 1,3272021: 9002022: 6922023: 1,4142024: 7292025: 7722026: 9751793186918911909192619431960197719942011
Records set or tied on this calendar date in each year from 1793 to 1909. 1909 had 30 records.
Counts for years before the ledger starts come from the same station rules.
Records on 08-15 in each year
YearRecords
17932
18021
18051
18121
18211
18382
18391
18411
18441
18453
18521
18541
18561
18581
18613
18671
18682
18691
18732
18751
18762
18771
18781
18791
18803
18812
18822
18831
18842
18853
18861
18871
18883
18902
18912
18923
18933
18951
18969
18973
18981
18992
19006
19015
190210
19035
190417
190526
19068
190714
190815
190930
191016
191126
191234
191342
191411
191526
1916223
191732
191823
191922
192059
192155
192286
1923116
1924220
192591
1926115
1927223
1928271
1929586
1930274
1931351
1932368
1933268
1934992
1935414
1936867
1937574
1938681
1939450
1940372
1941289
1942377
1943426
1944610
1945433
1946285
1947559
1948366
1949559
1950317
1951597
1952596
1953449
1954481
1955539
1956390
1957355
19581,092
1959515
1960417
1961704
19621,052
1963972
19641,185
1965535
1966340
1967687
19681,002
1969583
1970382
1971899
1972613
1973499
1974512
1975490
19761,345
1977550
1978841
19791,788
1980745
1981588
1982479
1983955
1984622
1985915
19861,283
19871,098
19881,479
1989495
1990758
1991778
19921,638
1993831
19941,073
19951,298
1996929
1997927
1998861
1999956
2000932
20011,254
20021,307
20031,248
20041,424
20051,067
2006923
20071,317
2008964
20091,038
20101,622
2011770
2012654
2013711
2014583
2015759
2016707
2017532
2018328
2019435
20201,327
2021900
2022692
20231,414
2024729
2025772
2026975

Download the Data

  • Data for records on 1909-08-15: 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).