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Built 2026-10-19 (19 October 2026)

Weather Records on 20 April 1917

33 weather records were set or tied worldwide on 20 April 1917. Highest significance: Sydney (Observatory Hill), AU.

Key Facts for 20 April 1917

  • On 20 April 1917, 33 weather records were set or tied at long-record stations worldwide.
  • 12 were record highs and 4 were record lows, counting maximum and minimum temperature.
  • By timescale, 0 were all-time records, 2 monthly and 31 daily.
  • Sydney (Observatory Hill) set a daily record precipitation of 32.3 mm (1.3 in) on 20 April 1917.
  • Across 159 earlier years (1807 to 2026) the same calendar date averaged 465 records.

Record Map

33 stations
Weather records on 20 April 1917 33 station records on 20 April 1917 are marked on the map, coloured by record type.
33 station records on 20 April 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.
Weather records on 20 April 1917: highest significance records shown on the map
StationCountryTypeValueSignificance
Sydney (Observatory Hill)AustraliaRecord daily precipitation32.3 mm (1.3 in)25 of 100 (Routine)
Glenfield (Macquarie)AustraliaRecord daily precipitation61.0 mm (2.4 in)25 of 100 (Routine)
Burwood 1AustraliaRecord daily precipitation47.0 mm (1.9 in)24 of 100 (Routine)
Dural Public SchoolAustraliaRecord daily precipitation32.8 mm (1.3 in)24 of 100 (Routine)
Olands Norra UddeSwedenRecord daily precipitation6.7 mm (0.26 in)20 of 100 (Routine)
Cleveland 2717 EuclidUnited StatesRecord high minimum temperature16.7 C (62.1 F)20 of 100 (Routine)
Cape Moreton LighthouseAustraliaRecord daily precipitation80.8 mm (3.2 in)18 of 100 (Routine)
InnsbruckAustriaRecord low maximum temperature5.6 C (42.1 F)18 of 100 (Routine)
Cleveland 2717 EuclidUnited StatesRecord high maximum temperature26.7 C (80.1 F)18 of 100 (Routine)
Crown St. ReservoirAustraliaRecord daily precipitation49.3 mm (1.9 in)17 of 100 (Routine)
OttawaCanadaRecord daily precipitation7.1 mm (0.28 in)16 of 100 (Routine)
WellandCanadaRecord high minimum temperature10.0 C (50.0 F)16 of 100 (Routine)
Millwood (Bos)South AfricaRecord daily precipitation10.9 mm (0.4 in)16 of 100 (Routine)
Harrington (Oxley Anchorage CaAustraliaRecord daily precipitation25.4 mm (1.0 in)15 of 100 (Routine)
Epping Chester StreetAustraliaRecord daily precipitation22.9 mm (0.9 in)15 of 100 (Routine)
BuffaloUnited StatesRecord high minimum temperature10.0 C (50.0 F)15 of 100 (Routine)
New WestminsterCanadaRecord low maximum temperature8.9 C (48.0 F)14 of 100 (Routine)
WellandCanadaRecord high maximum temperature22.2 C (72.0 F)14 of 100 (Routine)
StratfordCanadaRecord high maximum temperature23.3 C (73.9 F)14 of 100 (Routine)
London SouthCanadaRecord high maximum temperature24.4 C (75.9 F)13 of 100 (Routine)
AstrakanRussiaRecord daily precipitation1.5 mm (0.06 in)13 of 100 (Routine)
Greenville Dwtn APUnited StatesRecord high maximum temperature34.4 C (93.9 F)13 of 100 (Routine)
Cataract RiverAustraliaRecord daily precipitation42.7 mm (1.7 in)11 of 100 (Routine)
Knysna (Tnk)South AfricaRecord daily precipitation8.1 mm (0.32 in)11 of 100 (Routine)
SouthamptonCanadaRecord high maximum temperature22.8 C (73.0 F)10 of 100 (Routine)
InnsbruckAustriaRecord low minimum temperature-0.9 C (30.4 F)9 of 100 (Routine)
BurlingtonUnited StatesRecord daily precipitation14.7 mm (0.6 in)7 of 100 (Routine)
Taree (Radio Station 2Re)AustraliaRecord daily precipitation11.7 mm (0.5 in)6 of 100 (Routine)
MalvernUnited StatesRecord daily precipitation30.5 mm (1.2 in)6 of 100 (Routine)
Wilmington Wb CityUnited StatesRecord high maximum temperature32.2 C (90.0 F)6 of 100 (Routine)
Parry SoundCanadaRecord high maximum temperature21.1 C (70.0 F)2 of 100 (Routine)
SouthamptonCanadaRecord high minimum temperature8.3 C (46.9 F)2 of 100 (Routine)
AstoriaUnited StatesRecord low maximum temperature10.6 C (51.1 F)2 of 100 (Routine)

Counts by Type and Timescale

33 records
Records on 20 April 1917 by type Records set or tied on 20 April 1917 by type: Highest daily maximum 8, Lowest daily maximum 3, Highest daily minimum 4, Lowest daily minimum 1, Heaviest daily rainfall 17. 05101520Highest daily maximum: 8Lowest daily maximum: 3Highest daily minimum: 4Lowest daily minimum: 1Heaviest daily rainfall: 17Heaviest daily snowfall: 0Deepest snow cover: 0Max highMax lowMin highMin lowRainSnowDepth
Records set or tied on 20 April 1917 by type: Highest daily maximum 8, Lowest daily maximum 3, Highest daily minimum 4, Lowest daily minimum 1, Heaviest daily rainfall 17.
Records on 20 April 1917 by type
Record typeRecords
Highest daily maximum8
Lowest daily maximum3
Highest daily minimum4
Lowest daily minimum1
Heaviest daily rainfall17
Heaviest daily snowfall0
Deepest snow cover0
Records on 20 April 1917 by timescale Records on 20 April 1917 by timescale: all-time 0, monthly 2, daily 31. 010203040all-time: 0monthly: 2daily: 31all-timemonthlydaily
Records on 20 April 1917 by timescale: all-time 0, monthly 2, daily 31.
Records on 20 April 1917 by timescale
TimescaleRecords
all-time0
monthly2
daily31

How Much Records Were Beaten By

29 broken records
Histogram of margins by which records were beaten on 20 April 1917 Margins by which the 29 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 20.6. Ties are not counted. 051015200 to 5: 205 to 10: 410 to 15: 115 to 20: 320 to 25: 10 to 55 to 1010 to 1515 to 2020 to 25
Margins by which the 29 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 20.6. Ties are not counted.
Histogram of margins by which records were beaten on 20 April 1917
MarginRecords
0 to 520
5 to 104
10 to 151
15 to 203
20 to 251

Top 20 by Significance

20 April 1917
Top 20 records on 20 April 1917 by significance
DateStationRecordValueBeat old record byOld record stoodSignificance
20 April 1917Sydney (Observatory Hill), AUdaily rain32.3 mm (1.3 in)9.4 mm (0.37 in)51 years25 of 100 (Routine)
20 April 1917Glenfield (Macquarie), AUdaily rain61.0 mm (2.4 in)17.8 mm (0.7 in)22 years25 of 100 (Routine)
20 April 1917Burwood 1, AUdaily rain47.0 mm (1.9 in)20.6 mm (0.8 in)23 years24 of 100 (Routine)
20 April 1917Dural Public School, AUdaily rain32.8 mm (1.3 in)16.5 mm (0.6 in)24 years24 of 100 (Routine)
20 April 1917Olands Norra Udde, SEdaily rain6.7 mm (0.26 in)3.5 mm (0.14 in)29 years20 of 100 (Routine)
20 April 1917Cleveland 2717 Euclid, USdaily high min16.7 C (62.1 F)2.8 C (5.0 F)38 years20 of 100 (Routine)
20 April 1917Cape Moreton Lighthouse, AUdaily rain80.8 mm (3.2 in)14.3 mm (0.6 in)27 years18 of 100 (Routine)
20 April 1917Innsbruck, ATdaily low max5.6 C (42.1 F)1.4 C (2.5 F)39 years18 of 100 (Routine)
20 April 1917Cleveland 2717 Euclid, USdaily high max26.7 C (80.1 F)2.8 C (5.0 F)38 years18 of 100 (Routine)
20 April 1917Crown St. Reservoir, AUdaily rain49.3 mm (1.9 in)15.5 mm (0.6 in)23 years17 of 100 (Routine)
20 April 1917Ottawa, CAdaily rain7.1 mm (0.28 in)0.7 mm (0.03 in)42 years16 of 100 (Routine)
20 April 1917Welland, CAdaily high min10.0 C (50.0 F)0.6 C (1.1 F)38 years16 of 100 (Routine)
20 April 1917Millwood (Bos), ZAdaily rain10.9 mm (0.4 in)7.9 mm (0.31 in)28 years16 of 100 (Routine)
20 April 1917Harrington (Oxley Anchorage Ca, AUdaily rain25.4 mm (1.0 in)8.6 mm (0.34 in)24 years15 of 100 (Routine)
20 April 1917Epping Chester Street, AUdaily rain22.9 mm (0.9 in)8.4 mm (0.33 in)22 years15 of 100 (Routine)
20 April 1917Buffalo, USdaily high min10.0 C (50.0 F)1.1 C (2.0 F)31 years15 of 100 (Routine)
20 April 1917New Westminster, CAdaily low max8.9 C (48.0 F)2.2 C (4.0 F)17 years14 of 100 (Routine)
20 April 1917Welland, CAdaily high max22.2 C (72.0 F)1.1 C (2.0 F)30 years14 of 100 (Routine)
20 April 1917Stratford, CAdaily high max23.3 C (73.9 F)0.5 C (0.9 F)30 years14 of 100 (Routine)
20 April 1917London South, CAdaily high max24.4 C (75.9 F)1.1 C (2.0 F)30 years13 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

1807 to 1917
Records on 04-20 in each year Records set or tied on this calendar date in each year from 1807 to 1917. 1917 had 33 records. 05001,0001,5002,0001807: 31817: 11838: 11849: 21851: 11852: 41854: 11858: 11860: 11864: 11865: 31868: 11869: 11870: 11872: 11874: 31875: 41876: 11878: 21880: 21881: 21884: 11885: 11886: 21889: 11891: 21892: 11893: 61894: 81895: 71896: 31897: 61898: 11899: 11901: 81902: 31903: 141904: 311905: 91906: 121907: 181908: 141909: 221910: 251911: 181912: 121913: 191914: 461915: 451916: 191917: 331918: 421919: 171920: 491921: 271922: 401923: 1571924: 1131925: 1691926: 3101927: 4421928: 2121929: 1821930: 871931: 2551932: 1661933: 2791934: 3841935: 3841936: 3111937: 4271938: 3391939: 1581940: 5191941: 5581942: 2231943: 6701944: 3041945: 3911946: 3951947: 3081948: 4931949: 4771950: 3291951: 6901952: 5521953: 1,0711954: 3771955: 6231956: 3841957: 7301958: 3271959: 5631960: 4721961: 1,0781962: 4871963: 5951964: 7491965: 7241966: 1,1741967: 8641968: 9751969: 3821970: 9481971: 7651972: 5311973: 9821974: 6731975: 3441976: 6611977: 6931978: 8001979: 4951980: 1,5391981: 7061982: 9061983: 1,8441984: 9221985: 1,1401986: 7701987: 1,4471988: 1,1441989: 1,1871990: 1,4951991: 1,0751992: 1,0091993: 7721994: 7561995: 1,3511996: 9701997: 8331998: 1,4901999: 6742000: 9312001: 7522002: 1,0812003: 7582004: 5672005: 7072006: 8592007: 5822008: 1,1102009: 8452010: 6932011: 1,4772012: 7262013: 1,5202014: 3842015: 7022016: 6502017: 7342018: 1,3092019: 1,0192020: 4492021: 1,2152022: 5962023: 8282024: 6732025: 8362026: 5331807187518981915193119471963197919952011
Records set or tied on this calendar date in each year from 1807 to 1917. 1917 had 33 records.
Counts for years before the ledger starts come from the same station rules.
Records on 04-20 in each year
YearRecords
18073
18171
18381
18492
18511
18524
18541
18581
18601
18641
18653
18681
18691
18701
18721
18743
18754
18761
18782
18802
18812
18841
18851
18862
18891
18912
18921
18936
18948
18957
18963
18976
18981
18991
19018
19023
190314
190431
19059
190612
190718
190814
190922
191025
191118
191212
191319
191446
191545
191619
191733
191842
191917
192049
192127
192240
1923157
1924113
1925169
1926310
1927442
1928212
1929182
193087
1931255
1932166
1933279
1934384
1935384
1936311
1937427
1938339
1939158
1940519
1941558
1942223
1943670
1944304
1945391
1946395
1947308
1948493
1949477
1950329
1951690
1952552
19531,071
1954377
1955623
1956384
1957730
1958327
1959563
1960472
19611,078
1962487
1963595
1964749
1965724
19661,174
1967864
1968975
1969382
1970948
1971765
1972531
1973982
1974673
1975344
1976661
1977693
1978800
1979495
19801,539
1981706
1982906
19831,844
1984922
19851,140
1986770
19871,447
19881,144
19891,187
19901,495
19911,075
19921,009
1993772
1994756
19951,351
1996970
1997833
19981,490
1999674
2000931
2001752
20021,081
2003758
2004567
2005707
2006859
2007582
20081,110
2009845
2010693
20111,477
2012726
20131,520
2014384
2015702
2016650
2017734
20181,309
20191,019
2020449
20211,215
2022596
2023828
2024673
2025836
2026533

Download the Data

  • Data for records on 1917-04-20: 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).