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Built 2026-10-19 (19 October 2026)

Weather Records on 20 May 1917

46 weather records were set or tied worldwide on 20 May 1917. Highest significance: Genoa, IT.

Key Facts for 20 May 1917

  • On 20 May 1917, 46 weather records were set or tied at long-record stations worldwide.
  • 6 were record highs and 17 were record lows, counting maximum and minimum temperature.
  • By timescale, 0 were all-time records, 0 monthly and 46 daily.
  • Genoa set a daily record precipitation of 29.9 mm (1.2 in) on 20 May 1917.
  • Across 162 earlier years (1802 to 2026) the same calendar date averaged 458 records.

Record Map

46 stations
Weather records on 20 May 1917 46 station records on 20 May 1917 are marked on the map, coloured by record type.
46 station records on 20 May 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.
Weather records on 20 May 1917: highest significance records shown on the map
StationCountryTypeValueSignificance
GenoaItalyRecord daily precipitation29.9 mm (1.2 in)34 of 100 (Routine)
OuttrimAustraliaRecord daily precipitation26.2 mm (1.0 in)31 of 100 (Routine)
StratfordCanadaRecord daily precipitation30.2 mm (1.2 in)29 of 100 (Routine)
Sable Island East EndCanadaRecord daily precipitation33.0 mm (1.3 in)27 of 100 (Routine)
Kiandra ChaletAustraliaRecord daily precipitation45.7 mm (1.8 in)25 of 100 (Routine)
Cape Otway LighthouseAustraliaRecord daily precipitation26.4 mm (1.0 in)23 of 100 (Routine)
ParisCanadaRecord daily precipitation40.1 mm (1.6 in)23 of 100 (Routine)
Uppsala_AutSwedenRecord low minimum temperature-4.4 C (24.1 F)22 of 100 (Routine)
Nariel Creek (Simpson)AustraliaRecord daily precipitation22.9 mm (0.9 in)20 of 100 (Routine)
Coranderrk Badger WeirAustraliaRecord daily precipitation12.4 mm (0.5 in)19 of 100 (Routine)
Dingo ValeAustraliaRecord daily precipitation37.6 mm (1.5 in)18 of 100 (Routine)
Port DoverCanadaRecord daily precipitation20.1 mm (0.8 in)18 of 100 (Routine)
BicCanadaRecord daily snowfall2.5 cm (1.0 in)18 of 100 (Routine)
YellowinAustraliaRecord daily precipitation9.9 mm (0.39 in)17 of 100 (Routine)
Port Campbell Post OfficeAustraliaRecord daily precipitation20.3 mm (0.8 in)16 of 100 (Routine)
PiteaSwedenRecord low minimum temperature-4.5 C (23.9 F)16 of 100 (Routine)
KaresuandoSwedenRecord low minimum temperature-10.0 C (14.0 F)16 of 100 (Routine)
DromanaAustraliaRecord daily precipitation17.0 mm (0.7 in)15 of 100 (Routine)
StockholmSwedenRecord low minimum temperature-1.0 C (30.2 F)13 of 100 (Routine)
NicosiaCyprusRecord high minimum temperature18.3 C (64.9 F)12 of 100 (Routine)
Greenville Dwtn APUnited StatesRecord high maximum temperature33.3 C (91.9 F)12 of 100 (Routine)
LobethalAustraliaRecord daily precipitation36.1 mm (1.4 in)11 of 100 (Routine)
Fairlight StationAustraliaRecord daily precipitation6.6 mm (0.26 in)11 of 100 (Routine)
Munchen-NymphenburgGermanyRecord high minimum temperature14.5 C (58.1 F)11 of 100 (Routine)
Brisbane Regional OfficeAustraliaRecord low minimum temperature7.5 C (45.5 F)10 of 100 (Routine)
Guelph OacCanadaRecord daily precipitation24.1 mm (0.9 in)10 of 100 (Routine)
Saint JohnCanadaRecord low maximum temperature8.3 C (46.9 F)10 of 100 (Routine)
St. PetersburgRussiaRecord low minimum temperature-1.5 C (29.3 F)10 of 100 (Routine)
JokkmokkSwedenRecord low maximum temperature-1.0 C (30.2 F)10 of 100 (Routine)
JokkmokkSwedenRecord low minimum temperature-8.0 C (17.6 F)10 of 100 (Routine)
UmeaSwedenRecord low maximum temperature2.5 C (36.5 F)9 of 100 (Routine)
Echunga Golf CourseAustraliaRecord daily precipitation18.5 mm (0.7 in)8 of 100 (Routine)
Mount BarkerAustraliaRecord daily precipitation15.7 mm (0.6 in)8 of 100 (Routine)
PiteaSwedenRecord low maximum temperature1.5 C (34.7 F)8 of 100 (Routine)
HaparandaSwedenRecord low maximum temperature2.5 C (36.5 F)7 of 100 (Routine)
EskdaleAustraliaRecord daily precipitation13.2 mm (0.5 in)6 of 100 (Routine)
St. PetersburgRussiaRecord low maximum temperature3.7 C (38.7 F)6 of 100 (Routine)
GumerachaAustraliaRecord daily precipitation19.8 mm (0.8 in)5 of 100 (Routine)
Nuwara EliyaSri LankaRecord low minimum temperature7.3 C (45.1 F)5 of 100 (Routine)
FreiburgGermanyRecord high maximum temperature29.1 C (84.4 F)4 of 100 (Routine)
HaparandaSwedenRecord low minimum temperature-5.0 C (23.0 F)2 of 100 (Routine)
KaresuandoSwedenRecord low maximum temperature-0.5 C (31.1 F)2 of 100 (Routine)
PortlandUnited StatesRecord high maximum temperature26.1 C (79.0 F)2 of 100 (Routine)
Cape May 2 NWUnited StatesRecord high maximum temperature31.1 C (88.0 F)2 of 100 (Routine)
MinlatonAustraliaRecord daily precipitation6.1 mm (0.24 in)1 of 100 (Routine)
Gunnedah PoolAustraliaRecord low maximum temperature11.1 C (52.0 F)1 of 100 (Routine)

Counts by Type and Timescale

46 records
Records on 20 May 1917 by type Records set or tied on 20 May 1917 by type: Highest daily maximum 4, Lowest daily maximum 8, Highest daily minimum 2, Lowest daily minimum 9, Heaviest daily rainfall 22, Heaviest daily snowfall 1. 0102030Highest daily maximum: 4Lowest daily maximum: 8Highest daily minimum: 2Lowest daily minimum: 9Heaviest daily rainfall: 22Heaviest daily snowfall: 1Deepest snow cover: 0Max highMax lowMin highMin lowRainSnowDepth
Records set or tied on 20 May 1917 by type: Highest daily maximum 4, Lowest daily maximum 8, Highest daily minimum 2, Lowest daily minimum 9, Heaviest daily rainfall 22, Heaviest daily snowfall 1.
Records on 20 May 1917 by type
Record typeRecords
Highest daily maximum4
Lowest daily maximum8
Highest daily minimum2
Lowest daily minimum9
Heaviest daily rainfall22
Heaviest daily snowfall1
Deepest snow cover0
Records on 20 May 1917 by timescale Records on 20 May 1917 by timescale: all-time 0, monthly 0, daily 46. 0204060all-time: 0monthly: 0daily: 46all-timemonthlydaily
Records on 20 May 1917 by timescale: all-time 0, monthly 0, daily 46.
Records on 20 May 1917 by timescale
TimescaleRecords
all-time0
monthly0
daily46

How Much Records Were Beaten By

40 broken records
Histogram of margins by which records were beaten on 20 May 1917 Margins by which the 40 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 25.0. Ties are not counted. 01020300 to 5: 265 to 10: 410 to 15: 615 to 20: 220 to 25: 20 to 55 to 1010 to 1515 to 2020 to 25
Margins by which the 40 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 25.0. Ties are not counted.
Histogram of margins by which records were beaten on 20 May 1917
MarginRecords
0 to 526
5 to 104
10 to 156
15 to 202
20 to 252

Top 20 by Significance

20 May 1917
Top 20 records on 20 May 1917 by significance
DateStationRecordValueBeat old record byOld record stoodSignificance
20 May 1917Genoa, ITdaily rain29.9 mm (1.2 in)16.4 mm (0.6 in)37 years34 of 100 (Routine)
20 May 1917Outtrim, AUdaily rain26.2 mm (1.0 in)14.8 mm (0.6 in)30 years31 of 100 (Routine)
20 May 1917Stratford, CAdaily rain30.2 mm (1.2 in)11.1 mm (0.4 in)38 years29 of 100 (Routine)
20 May 1917Sable Island East End, CAdaily rain33.0 mm (1.3 in)19.0 mm (0.7 in)15 years27 of 100 (Routine)
20 May 1917Kiandra Chalet, AUdaily rain45.7 mm (1.8 in)22.1 mm (0.9 in)21 years25 of 100 (Routine)
20 May 1917Cape Otway Lighthouse, AUdaily rain26.4 mm (1.0 in)10.1 mm (0.4 in)0 years23 of 100 (Routine)
20 May 1917Paris, CAdaily rain40.1 mm (1.6 in)12.4 mm (0.5 in)24 years23 of 100 (Routine)
20 May 1917Uppsala_Aut, SEdaily low min-4.4 C (24.1 F)0.3 C (0.5 F)52 years22 of 100 (Routine)
20 May 1917Nariel Creek (Simpson), AUdaily rain22.9 mm (0.9 in)12.5 mm (0.5 in)30 years20 of 100 (Routine)
20 May 1917Coranderrk Badger Weir, AUdaily rain12.4 mm (0.5 in)4.8 mm (0.19 in)34 years19 of 100 (Routine)
20 May 1917Dingo Vale, AUdaily rain37.6 mm (1.5 in)13.5 mm (0.5 in)10 years18 of 100 (Routine)
20 May 1917Port Dover, CAdaily rain20.1 mm (0.8 in)6.4 mm (0.25 in)19 years18 of 100 (Routine)
20 May 1917Bic, CAdaily snowfall2.5 cm (1.0 in)2.5 cm (1.0 in)33 years18 of 100 (Routine)
20 May 1917Yellowin, AUdaily rain9.9 mm (0.39 in)6.9 mm (0.27 in)30 years17 of 100 (Routine)
20 May 1917Port Campbell Post Office, AUdaily rain20.3 mm (0.8 in)6.1 mm (0.24 in)14 years16 of 100 (Routine)
20 May 1917Pitea, SEdaily low min-4.5 C (23.9 F)1.5 C (2.7 F)31 years16 of 100 (Routine)
20 May 1917Karesuando, SEdaily low min-10.0 C (14.0 F)2.0 C (3.6 F)32 years16 of 100 (Routine)
20 May 1917Dromana, AUdaily rain17.0 mm (0.7 in)7.6 mm (0.30 in)4 years15 of 100 (Routine)
20 May 1917Stockholm, SEdaily low min-1.0 C (30.2 F)1.5 C (2.7 F)22 years13 of 100 (Routine)
20 May 1917Nicosia, CYdaily high min18.3 C (64.9 F)0.5 C (0.9 F)28 years12 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

1802 to 1917
Records on 05-20 in each year Records set or tied on this calendar date in each year from 1802 to 1917. 1917 had 46 records. 01,0002,0003,0001802: 11803: 11804: 11815: 11825: 11837: 11844: 11845: 31847: 11854: 11858: 31861: 11862: 11865: 11867: 11868: 21870: 31871: 21876: 21877: 31879: 11880: 21884: 21885: 11887: 21889: 31890: 31891: 51892: 31893: 11894: 61895: 31896: 31897: 31898: 41899: 41900: 11901: 51902: 111903: 191904: 41905: 41906: 221907: 351908: 231909: 101910: 201911: 821912: 201913: 101914: 161915: 421916: 291917: 461918: 921919: 561920: 441921: 2341922: 401923: 1251924: 1891925: 2511926: 1281927: 1181928: 1381929: 3231930: 1291931: 4511932: 6891933: 4491934: 5821935: 2591936: 2071937: 2701938: 3311939: 2661940: 3371941: 3781942: 3371943: 8021944: 3151945: 4981946: 3391947: 3581948: 5141949: 5861950: 3271951: 2881952: 6151953: 5181954: 8221955: 4211956: 5651957: 7281958: 3781959: 7851960: 6121961: 3331962: 7731963: 7321964: 5171965: 2001966: 4161967: 5871968: 7431969: 8851970: 3101971: 6531972: 6121973: 4191974: 8931975: 1,3321976: 8371977: 5531978: 5341979: 6831980: 7511981: 1,5401982: 5541983: 1,3071984: 8671985: 4261986: 7901987: 1,0361988: 8051989: 7641990: 7221991: 9251992: 1,2001993: 1,2081994: 7781995: 7341996: 1,7491997: 1,1061998: 1,1241999: 6732000: 9912001: 8472002: 2,2992003: 1,2012004: 7462005: 9292006: 1,0062007: 5652008: 9992009: 1,5292010: 1,0112011: 1,1172012: 6042013: 9192014: 6292015: 1,0012016: 6922017: 1,2142018: 4602019: 1,4832020: 7842021: 9042022: 1,6432023: 1,1062024: 4782025: 9692026: 6961802187118981915193219491966198320002017
Records set or tied on this calendar date in each year from 1802 to 1917. 1917 had 46 records.
Counts for years before the ledger starts come from the same station rules.
Records on 05-20 in each year
YearRecords
18021
18031
18041
18151
18251
18371
18441
18453
18471
18541
18583
18611
18621
18651
18671
18682
18703
18712
18762
18773
18791
18802
18842
18851
18872
18893
18903
18915
18923
18931
18946
18953
18963
18973
18984
18994
19001
19015
190211
190319
19044
19054
190622
190735
190823
190910
191020
191182
191220
191310
191416
191542
191629
191746
191892
191956
192044
1921234
192240
1923125
1924189
1925251
1926128
1927118
1928138
1929323
1930129
1931451
1932689
1933449
1934582
1935259
1936207
1937270
1938331
1939266
1940337
1941378
1942337
1943802
1944315
1945498
1946339
1947358
1948514
1949586
1950327
1951288
1952615
1953518
1954822
1955421
1956565
1957728
1958378
1959785
1960612
1961333
1962773
1963732
1964517
1965200
1966416
1967587
1968743
1969885
1970310
1971653
1972612
1973419
1974893
19751,332
1976837
1977553
1978534
1979683
1980751
19811,540
1982554
19831,307
1984867
1985426
1986790
19871,036
1988805
1989764
1990722
1991925
19921,200
19931,208
1994778
1995734
19961,749
19971,106
19981,124
1999673
2000991
2001847
20022,299
20031,201
2004746
2005929
20061,006
2007565
2008999
20091,529
20101,011
20111,117
2012604
2013919
2014629
20151,001
2016692
20171,214
2018460
20191,483
2020784
2021904
20221,643
20231,106
2024478
2025969
2026696

Download the Data

  • Data for records on 1917-05-20: 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).