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Built 2026-10-15 (15 October 2026)

Weather Records on 21 June 1917

97 weather records were set or tied worldwide on 21 June 1917. Highest significance: Jena Sternwarte, DE.

Key Facts for 21 June 1917

  • On 21 June 1917, 97 weather records were set or tied at long-record stations worldwide.
  • 55 were record highs and 6 were record lows, counting maximum and minimum temperature.
  • By timescale, 5 were all-time records, 10 monthly and 82 daily.
  • Jena Sternwarte set a daily record high minimum temperature of 18.8 C (65.8 F) on 21 June 1917.
  • Across 165 earlier years (1802 to 2026) the same calendar date averaged 433 records.

Record Map

97 stations
Weather records on 21 June 1917 97 station records on 21 June 1917 are marked on the map, coloured by record type.
97 station records on 21 June 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.
Weather records on 21 June 1917: highest significance records shown on the map
StationCountryTypeValueSignificance
Jena SternwarteGermanyRecord high minimum temperature18.8 C (65.8 F)37 of 100 (Notable)
FreiburgGermanyRecord daily precipitation45.5 mm (1.8 in)35 of 100 (Notable)
KerkwerveNetherlandsRecord daily precipitation43.8 mm (1.7 in)32 of 100 (Routine)
SandvigDenmarkRecord high minimum temperature22.4 C (72.3 F)31 of 100 (Routine)
NewportUnited StatesRecord daily precipitation33.0 mm (1.3 in)28 of 100 (Routine)
KremsmuensterAustriaRecord high minimum temperature19.4 C (66.9 F)26 of 100 (Routine)
Visby_FlygplatsSwedenRecord high maximum temperature31.0 C (87.8 F)25 of 100 (Routine)
Koebenhavn: Landbohojskolen-1DenmarkRecord high maximum temperature31.2 C (88.2 F)24 of 100 (Routine)
SandvigDenmarkRecord high maximum temperature32.9 C (91.2 F)24 of 100 (Routine)
Berlin-DahlemGermanyRecord high minimum temperature22.3 C (72.1 F)24 of 100 (Routine)
KristianstadSwedenRecord high maximum temperature29.5 C (85.1 F)24 of 100 (Routine)
BorasSwedenRecord high minimum temperature18.0 C (64.4 F)22 of 100 (Routine)
TranebjergDenmarkRecord high minimum temperature16.5 C (61.7 F)21 of 100 (Routine)
GenoaItalyRecord daily precipitation30.1 mm (1.2 in)21 of 100 (Routine)
OrebroSwedenRecord high minimum temperature18.0 C (64.4 F)21 of 100 (Routine)
Frankfurt/Main (Feldbergstr.)GermanyRecord daily precipitation20.1 mm (0.8 in)20 of 100 (Routine)
Sunbury (Salesian College )AustraliaRecord daily precipitation22.4 mm (0.9 in)20 of 100 (Routine)
TranebjergDenmarkRecord daily precipitation17.1 mm (0.7 in)20 of 100 (Routine)
Nikolaevsk-Na-AmureRussiaRecord daily precipitation14.8 mm (0.6 in)20 of 100 (Routine)
BjurakerSwedenRecord daily precipitation22.0 mm (0.9 in)20 of 100 (Routine)
West TerschellingNetherlandsRecord daily precipitation18.2 mm (0.7 in)20 of 100 (Routine)
Koebenhavn - Meteorologisk InsDenmarkRecord daily precipitation15.0 mm (0.6 in)20 of 100 (Routine)
MagdeburgGermanyRecord high minimum temperature19.8 C (67.6 F)20 of 100 (Routine)
NurnbergGermanyRecord high minimum temperature16.9 C (62.4 F)20 of 100 (Routine)
HarnosandSwedenRecord high minimum temperature16.0 C (60.8 F)20 of 100 (Routine)
StockholmSwedenRecord high maximum temperature31.5 C (88.7 F)20 of 100 (Routine)
Gosford (Gertrude Place)AustraliaRecord daily precipitation26.7 mm (1.1 in)19 of 100 (Routine)
BallanAustraliaRecord daily precipitation14.2 mm (0.6 in)19 of 100 (Routine)
Stony MountainCanadaRecord low minimum temperature-1.1 C (30.0 F)19 of 100 (Routine)
Nordby (Fano)DenmarkRecord daily precipitation11.4 mm (0.4 in)19 of 100 (Routine)
TartuEstoniaRecord high minimum temperature19.9 C (67.8 F)19 of 100 (Routine)
Uppsala_AutSwedenRecord high minimum temperature18.1 C (64.6 F)19 of 100 (Routine)
WangeroogeGermanyRecord daily precipitation18.5 mm (0.7 in)18 of 100 (Routine)
SalekhardRussiaRecord daily precipitation14.0 mm (0.6 in)18 of 100 (Routine)
BobundaraAustraliaRecord daily precipitation8.4 mm (0.33 in)17 of 100 (Routine)
PlauenGermanyRecord high minimum temperature18.1 C (64.6 F)17 of 100 (Routine)
Visby_FlygplatsSwedenRecord high minimum temperature18.5 C (65.3 F)17 of 100 (Routine)
BorasSwedenRecord high maximum temperature32.0 C (89.6 F)17 of 100 (Routine)
SalzburgAustriaRecord high minimum temperature19.3 C (66.7 F)16 of 100 (Routine)
Wrixum/FohrGermanyRecord daily precipitation16.8 mm (0.7 in)16 of 100 (Routine)
Groningen-1NetherlandsRecord daily precipitation22.5 mm (0.9 in)16 of 100 (Routine)
Linkoeping-MalmslaettSwedenRecord high minimum temperature18.5 C (65.3 F)16 of 100 (Routine)
HalmstadSwedenRecord high maximum temperature28.0 C (82.4 F)16 of 100 (Routine)
Box CowellAustraliaRecord daily precipitation4.6 mm (0.18 in)15 of 100 (Routine)
Milton Post OfficeAustraliaRecord daily precipitation29.2 mm (1.1 in)15 of 100 (Routine)
BambergGermanyRecord high minimum temperature15.4 C (59.7 F)15 of 100 (Routine)
VanersborgSwedenRecord high maximum temperature25.5 C (77.9 F)15 of 100 (Routine)
Skara 1SwedenRecord high minimum temperature15.5 C (59.9 F)15 of 100 (Routine)
OrebroSwedenRecord high maximum temperature30.0 C (86.0 F)15 of 100 (Routine)
Vasteras-HassloSwedenRecord high minimum temperature19.0 C (66.2 F)15 of 100 (Routine)
TranebjergDenmarkRecord high maximum temperature27.4 C (81.3 F)14 of 100 (Routine)
Munchen-NymphenburgGermanyRecord high minimum temperature16.6 C (61.9 F)14 of 100 (Routine)
HohenpeissenbergGermanyRecord high maximum temperature24.3 C (75.7 F)14 of 100 (Routine)
WinterswijkNetherlandsRecord daily precipitation21.7 mm (0.9 in)14 of 100 (Routine)
St. PetersburgRussiaRecord high maximum temperature30.3 C (86.5 F)14 of 100 (Routine)
VastervikSwedenRecord high minimum temperature16.5 C (61.7 F)14 of 100 (Routine)
Skara 1SwedenRecord high maximum temperature29.0 C (84.2 F)14 of 100 (Routine)
Nemours (Ghazaouet)AlgeriaRecord low maximum temperature20.0 C (68.0 F)13 of 100 (Routine)
Camden (Brownlow Hill)AustraliaRecord daily precipitation4.3 mm (0.17 in)13 of 100 (Routine)
ArnsbergGermanyRecord high minimum temperature16.9 C (62.4 F)13 of 100 (Routine)

Counts by Type and Timescale

97 records
Records on 21 June 1917 by type Records set or tied on 21 June 1917 by type: Highest daily maximum 21, Lowest daily maximum 3, Highest daily minimum 34, Lowest daily minimum 3, Heaviest daily rainfall 36. 010203040Highest daily maximum: 21Lowest daily maximum: 3Highest daily minimum: 34Lowest daily minimum: 3Heaviest daily rainfall: 36Heaviest daily snowfall: 0Deepest snow cover: 0Max highMax lowMin highMin lowRainSnowDepth
Records set or tied on 21 June 1917 by type: Highest daily maximum 21, Lowest daily maximum 3, Highest daily minimum 34, Lowest daily minimum 3, Heaviest daily rainfall 36.
Records on 21 June 1917 by type
Record typeRecords
Highest daily maximum21
Lowest daily maximum3
Highest daily minimum34
Lowest daily minimum3
Heaviest daily rainfall36
Heaviest daily snowfall0
Deepest snow cover0
Records on 21 June 1917 by timescale Records on 21 June 1917 by timescale: all-time 5, monthly 10, daily 82. 0255075100all-time: 5monthly: 10daily: 82all-timemonthlydaily
Records on 21 June 1917 by timescale: all-time 5, monthly 10, daily 82.
Records on 21 June 1917 by timescale
TimescaleRecords
all-time5
monthly10
daily82

How Much Records Were Beaten By

91 broken records
Histogram of margins by which records were beaten on 21 June 1917 Margins by which the 91 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 25.9. Ties are not counted. 0204060800 to 5: 775 to 10: 810 to 15: 215 to 20: 220 to 25: 025 to 30: 20 to 55 to 1010 to 1515 to 2020 to 2525 to 30
Margins by which the 91 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 25.9. Ties are not counted.
Histogram of margins by which records were beaten on 21 June 1917
MarginRecords
0 to 577
5 to 108
10 to 152
15 to 202
20 to 250
25 to 302

Top 20 by Significance

21 June 1917
Top 20 records on 21 June 1917 by significance
DateStationRecordValueBeat old record byOld record stoodSignificance
21 June 1917Jena Sternwarte, DEdaily high min18.8 C (65.8 F)0.7 C (1.3 F)89 years37 of 100 (Notable)
21 June 1917Freiburg, DEdaily rain45.5 mm (1.8 in)25.0 mm (1.0 in)14 years35 of 100 (Notable)
21 June 1917Kerkwerve, NLmonthly rain43.8 mm (1.7 in)4.8 mm (0.19 in)36 years32 of 100 (Routine)
21 June 1917Sandvig, DKall-time high min22.4 C (72.3 F)1.7 C (3.1 F)0 years31 of 100 (Routine)
21 June 1917Newport, USdaily rain33.0 mm (1.3 in)25.9 mm (1.0 in)19 years28 of 100 (Routine)
21 June 1917Kremsmuenster, ATmonthly high min19.4 C (66.9 F)1.0 C (1.8 F)31 years26 of 100 (Routine)
21 June 1917Visby_Flygplats, SEall-time high max31.0 C (87.8 F)0.9 C (1.6 F)2 years25 of 100 (Routine)
21 June 1917Koebenhavn: Landbohojskolen-1, DKmonthly high max31.2 C (88.2 F)0.5 C (0.9 F)31 years24 of 100 (Routine)
21 June 1917Sandvig, DKall-time high max32.9 C (91.2 F)0.2 C (0.4 F)0 years24 of 100 (Routine)
21 June 1917Berlin-Dahlem, DEmonthly high min22.3 C (72.1 F)0.8 C (1.4 F)28 years24 of 100 (Routine)
21 June 1917Kristianstad, SEdaily high max29.5 C (85.1 F)4.0 C (7.2 F)34 years24 of 100 (Routine)
21 June 1917Boras, SEmonthly high min18.0 C (64.4 F)0.5 C (0.9 F)28 years22 of 100 (Routine)
21 June 1917Tranebjerg, DKdaily high min16.5 C (61.7 F)2.4 C (4.3 F)27 years21 of 100 (Routine)
21 June 1917Genoa, ITdaily rain30.1 mm (1.2 in)8.5 mm (0.33 in)28 years21 of 100 (Routine)
21 June 1917Orebro, SEmonthly high min18.0 C (64.4 F)0.5 C (0.9 F)25 years21 of 100 (Routine)
21 June 1917Frankfurt/Main (Feldbergstr.), DEdaily rain20.1 mm (0.8 in)11.2 mm (0.4 in)44 years20 of 100 (Routine)
21 June 1917Sunbury (Salesian College ), AUdaily rain22.4 mm (0.9 in)11.0 mm (0.4 in)24 years20 of 100 (Routine)
21 June 1917Tranebjerg, DKdaily rain17.1 mm (0.7 in)7.1 mm (0.28 in)33 years20 of 100 (Routine)
21 June 1917Nikolaevsk-Na-Amure, RUdaily rain14.8 mm (0.6 in)7.2 mm (0.28 in)35 years20 of 100 (Routine)
21 June 1917Bjuraker, SEdaily rain22.0 mm (0.9 in)9.4 mm (0.37 in)10 years20 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 06-21 in each year Records set or tied on this calendar date in each year from 1802 to 1917. 1917 had 97 records. 05001,0001,5002,0001802: 11803: 21805: 11814: 11821: 31828: 11831: 11839: 21846: 11853: 11855: 11861: 31865: 11868: 11869: 41870: 31871: 11873: 11874: 11875: 21879: 11880: 11881: 11882: 11883: 11884: 21885: 11886: 31887: 11888: 31889: 11891: 11892: 21893: 71895: 61896: 31897: 31898: 61899: 61900: 61901: 51902: 201903: 151904: 71905: 141906: 191907: 151908: 201909: 191910: 361911: 121912: 141913: 341914: 241915: 401916: 801917: 971918: 771919: 321920: 421921: 851922: 431923: 2291924: 1241925: 3331926: 1621927: 1461928: 1391929: 841930: 1771931: 3401932: 1801933: 6451934: 2231935: 2471936: 6421937: 4751938: 3961939: 2501940: 6741941: 4011942: 3401943: 4391944: 4261945: 7091946: 3861947: 6371948: 3921949: 3911950: 3291951: 3471952: 5021953: 7611954: 5011955: 2711956: 5341957: 9321958: 6271959: 3561960: 4711961: 9561962: 1761963: 6671964: 4581965: 4001966: 4671967: 7891968: 6541969: 6871970: 6141971: 3941972: 9341973: 6831974: 5981975: 9961976: 7461977: 4761978: 3681979: 8571980: 6771981: 8891982: 6581983: 7521984: 9131985: 5161986: 6011987: 9401988: 1,8341989: 8561990: 8471991: 1,0671992: 1,6791993: 9391994: 7771995: 9781996: 1,0751997: 1,0371998: 1,7461999: 9942000: 1,2122001: 6582002: 8282003: 1,0342004: 6972005: 1,0902006: 7742007: 1,0852008: 5802009: 1,0602010: 8522011: 1,3402012: 1,1512013: 5712014: 4342015: 7072016: 8772017: 9542018: 5772019: 9692020: 5192021: 1,1322022: 7742023: 9872024: 6792025: 1,5362026: 7361802187318951912192919461963198019972014
Records set or tied on this calendar date in each year from 1802 to 1917. 1917 had 97 records.
Counts for years before the ledger starts come from the same station rules.
Records on 06-21 in each year
YearRecords
18021
18032
18051
18141
18213
18281
18311
18392
18461
18531
18551
18613
18651
18681
18694
18703
18711
18731
18741
18752
18791
18801
18811
18821
18831
18842
18851
18863
18871
18883
18891
18911
18922
18937
18956
18963
18973
18986
18996
19006
19015
190220
190315
19047
190514
190619
190715
190820
190919
191036
191112
191214
191334
191424
191540
191680
191797
191877
191932
192042
192185
192243
1923229
1924124
1925333
1926162
1927146
1928139
192984
1930177
1931340
1932180
1933645
1934223
1935247
1936642
1937475
1938396
1939250
1940674
1941401
1942340
1943439
1944426
1945709
1946386
1947637
1948392
1949391
1950329
1951347
1952502
1953761
1954501
1955271
1956534
1957932
1958627
1959356
1960471
1961956
1962176
1963667
1964458
1965400
1966467
1967789
1968654
1969687
1970614
1971394
1972934
1973683
1974598
1975996
1976746
1977476
1978368
1979857
1980677
1981889
1982658
1983752
1984913
1985516
1986601
1987940
19881,834
1989856
1990847
19911,067
19921,679
1993939
1994777
1995978
19961,075
19971,037
19981,746
1999994
20001,212
2001658
2002828
20031,034
2004697
20051,090
2006774
20071,085
2008580
20091,060
2010852
20111,340
20121,151
2013571
2014434
2015707
2016877
2017954
2018577
2019969
2020519
20211,132
2022774
2023987
2024679
20251,536
2026736

Download the Data

  • Data for records on 1917-06-21: 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-12).