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Weather Records on 21 December 1917

18 weather records were set or tied worldwide on 21 December 1917. Highest significance: Winnemucca AP, US.

Key Facts for 21 December 1917

  • On 21 December 1917, 18 weather records were set or tied at long-record stations worldwide.
  • 6 were record highs and 4 were record lows, counting maximum and minimum temperature.
  • By timescale, 0 were all-time records, 0 monthly and 18 daily.
  • Winnemucca AP set a daily record high maximum temperature of 15.6 C (60.1 F) on 21 December 1917.
  • Across 158 earlier years (1793 to 2025) the same calendar date averaged 492 records.

Record Map

18 stations
Weather records on 21 December 1917 18 station records on 21 December 1917 are marked on the map, coloured by record type.
18 station records on 21 December 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.
Weather records on 21 December 1917: highest significance records shown on the map
StationCountryTypeValueSignificance
Winnemucca APUnited StatesRecord high maximum temperature15.6 C (60.1 F)22 of 100 (Routine)
Southport Ridgeway AveAustraliaRecord daily precipitation62.2 mm (2.4 in)21 of 100 (Routine)
Pointe Au PereCanadaRecord high minimum temperature0.6 C (33.1 F)16 of 100 (Routine)
Algiers-Ville/UniversiteAlgeriaRecord low minimum temperature5.0 C (41.0 F)15 of 100 (Routine)
FerraraItalyRecord daily precipitation13.5 mm (0.5 in)13 of 100 (Routine)
Port Elliot Caravan ParkAustraliaRecord daily precipitation7.9 mm (0.31 in)12 of 100 (Routine)
QuebecCanadaRecord high minimum temperature0.6 C (33.1 F)12 of 100 (Routine)
ArnsbergGermanyRecord low maximum temperature-3.8 C (25.2 F)11 of 100 (Routine)
Houston Wb CityUnited StatesRecord high minimum temperature13.9 C (57.0 F)11 of 100 (Routine)
Cambooya Post OfficeAustraliaRecord daily precipitation11.9 mm (0.5 in)9 of 100 (Routine)
Perth Regional OfficeAustraliaRecord daily precipitation2.0 mm (0.08 in)8 of 100 (Routine)
Robe ComparisonAustraliaRecord high minimum temperature20.6 C (69.1 F)8 of 100 (Routine)
Beenleigh Post OfficeAustraliaRecord daily precipitation13.7 mm (0.5 in)8 of 100 (Routine)
BudgeryAustraliaRecord daily precipitation7.6 mm (0.30 in)8 of 100 (Routine)
Woodford Post OfficeAustraliaRecord daily precipitation23.4 mm (0.9 in)6 of 100 (Routine)
HambantotaSri LankaRecord low maximum temperature26.4 C (79.5 F)4 of 100 (Routine)
MagdeburgGermanyRecord low minimum temperature-9.6 C (14.7 F)2 of 100 (Routine)
Bird RocksCanadaRecord high maximum temperature8.9 C (48.0 F)1 of 100 (Routine)

Counts by Type and Timescale

18 records
Records on 21 December 1917 by type Records set or tied on 21 December 1917 by type: Highest daily maximum 2, Lowest daily maximum 2, Highest daily minimum 4, Lowest daily minimum 2, Heaviest daily rainfall 8. 02468Highest daily maximum: 2Lowest daily maximum: 2Highest daily minimum: 4Lowest daily minimum: 2Heaviest daily rainfall: 8Heaviest daily snowfall: 0Deepest snow cover: 0Max highMax lowMin highMin lowRainSnowDepth
Records set or tied on 21 December 1917 by type: Highest daily maximum 2, Lowest daily maximum 2, Highest daily minimum 4, Lowest daily minimum 2, Heaviest daily rainfall 8.
Records on 21 December 1917 by type
Record typeRecords
Highest daily maximum2
Lowest daily maximum2
Highest daily minimum4
Lowest daily minimum2
Heaviest daily rainfall8
Heaviest daily snowfall0
Deepest snow cover0
Records on 21 December 1917 by timescale Records on 21 December 1917 by timescale: all-time 0, monthly 0, daily 18. 05101520all-time: 0monthly: 0daily: 18all-timemonthlydaily
Records on 21 December 1917 by timescale: all-time 0, monthly 0, daily 18.
Records on 21 December 1917 by timescale
TimescaleRecords
all-time0
monthly0
daily18

How Much Records Were Beaten By

16 broken records
Histogram of margins by which records were beaten on 21 December 1917 Margins by which the 16 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 36.8. Ties are not counted. 0510150 to 5: 135 to 10: 210 to 15: 015 to 20: 020 to 25: 025 to 30: 030 to 35: 035 to 40: 10 to 55 to 1010 to 1515 to 2020 to 2525 to 3030 to 3535 to 40
Margins by which the 16 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 36.8. Ties are not counted.
Histogram of margins by which records were beaten on 21 December 1917
MarginRecords
0 to 513
5 to 102
10 to 150
15 to 200
20 to 250
25 to 300
30 to 350
35 to 401

Top 20 by Significance

21 December 1917
Top 18 records on 21 December 1917 by significance
DateStationRecordValueBeat old record byOld record stoodSignificance
21 December 1917Winnemucca AP, USdaily high max15.6 C (60.1 F)5.0 C (9.0 F)28 years22 of 100 (Routine)
21 December 1917Southport Ridgeway Ave, AUdaily rain62.2 mm (2.4 in)36.8 mm (1.4 in)4 years21 of 100 (Routine)
21 December 1917Pointe Au Pere, CAdaily high min0.6 C (33.1 F)3.9 C (7.0 F)22 years16 of 100 (Routine)
21 December 1917Algiers-Ville/Universite, DZdaily low min5.0 C (41.0 F)1.8 C (3.2 F)16 years15 of 100 (Routine)
21 December 1917Ferrara, ITdaily rain13.5 mm (0.5 in)3.5 mm (0.14 in)20 years13 of 100 (Routine)
21 December 1917Port Elliot Caravan Park, AUdaily rain7.9 mm (0.31 in)2.1 mm (0.08 in)14 years12 of 100 (Routine)
21 December 1917Quebec, CAdaily high min0.6 C (33.1 F)1.7 C (3.1 F)22 years12 of 100 (Routine)
21 December 1917Arnsberg, DEdaily low max-3.8 C (25.2 F)0.5 C (0.9 F)25 years11 of 100 (Routine)
21 December 1917Houston Wb City, USdaily high min13.9 C (57.0 F)0.6 C (1.1 F)25 years11 of 100 (Routine)
21 December 1917Cambooya Post Office, AUdaily rain11.9 mm (0.5 in)4.3 mm (0.17 in)11 years9 of 100 (Routine)
21 December 1917Perth Regional Office, AUdaily rain2.0 mm (0.08 in)1.2 mm (0.05 in)7 years8 of 100 (Routine)
21 December 1917Robe Comparison, AUdaily high min20.6 C (69.1 F)1.2 C (2.2 F)4 years8 of 100 (Routine)
21 December 1917Beenleigh Post Office, AUdaily rain13.7 mm (0.5 in)4.3 mm (0.17 in)11 years8 of 100 (Routine)
21 December 1917Budgery, AUdaily rain7.6 mm (0.30 in)5.6 mm (0.22 in)8 years8 of 100 (Routine)
21 December 1917Woodford Post Office, AUdaily rain23.4 mm (0.9 in)4.3 mm (0.17 in)4 years6 of 100 (Routine)
21 December 1917Hambantota, LKdaily low max26.4 C (79.5 F)0.1 C (0.2 F)2 years4 of 100 (Routine)
21 December 1917Magdeburg, DEdaily low min (Tie)-9.6 C (14.7 F)tie17 years2 of 100 (Routine)
21 December 1917Bird Rocks, CAdaily high max (Tie)8.9 C (48.0 F)tie14 years1 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 1917
Records on 12-21 in each year Records set or tied on this calendar date in each year from 1793 to 1917. 1917 had 18 records. 01,0002,0003,0004,0001793: 11794: 11799: 11801: 21808: 31825: 11828: 11839: 11846: 11850: 11855: 71859: 11860: 11868: 11870: 11871: 21874: 21875: 31876: 11877: 11878: 11879: 11880: 11884: 11886: 31889: 11890: 41893: 41894: 11895: 51896: 31897: 31898: 11900: 81901: 151902: 51903: 251904: 31905: 151906: 151907: 171908: 191909: 201910: 291911: 361912: 231913: 111914: 1071915: 431916: 401917: 181918: 411919: 571920: 301921: 1041922: 341923: 3231924: 3771925: 1201926: 1781927: 1471928: 701929: 1561930: 661931: 5561932: 1501933: 5811934: 2301935: 3981936: 3231937: 1891938: 1451939: 1401940: 6221941: 6511942: 9681943: 1481944: 7621945: 3961946: 4951947: 7001948: 2971949: 1,2811950: 5041951: 1,0611952: 1971953: 2561954: 4441955: 8881956: 6721957: 8461958: 5161959: 2721960: 5851961: 2541962: 5631963: 1,1371964: 6131965: 2471966: 4001967: 1,9231968: 8181969: 8281970: 5471971: 6801972: 6511973: 1,2921974: 3741975: 5481976: 4461977: 4701978: 5171979: 5581980: 7261981: 1,4761982: 7021983: 3,3241984: 1,0121985: 9791986: 4041987: 7751988: 7171989: 3,2031990: 2,7011991: 1,1251992: 7511993: 9671994: 7931995: 8781996: 1,1141997: 8101998: 1,1421999: 8512000: 9442001: 6502002: 5792003: 1,1032004: 6752005: 6062006: 1,4432007: 9462008: 1,0622009: 1,0972010: 2,0392011: 6532012: 7592013: 1,0292014: 8782015: 1,1732016: 5432017: 4592018: 7422019: 7552020: 9652021: 3232022: 5282023: 1,1702024: 7782025: 1,0991793187418981915193119471963197919952011
Records set or tied on this calendar date in each year from 1793 to 1917. 1917 had 18 records.
Counts for years before the ledger starts come from the same station rules.
Records on 12-21 in each year
YearRecords
17931
17941
17991
18012
18083
18251
18281
18391
18461
18501
18557
18591
18601
18681
18701
18712
18742
18753
18761
18771
18781
18791
18801
18841
18863
18891
18904
18934
18941
18955
18963
18973
18981
19008
190115
19025
190325
19043
190515
190615
190717
190819
190920
191029
191136
191223
191311
1914107
191543
191640
191718
191841
191957
192030
1921104
192234
1923323
1924377
1925120
1926178
1927147
192870
1929156
193066
1931556
1932150
1933581
1934230
1935398
1936323
1937189
1938145
1939140
1940622
1941651
1942968
1943148
1944762
1945396
1946495
1947700
1948297
19491,281
1950504
19511,061
1952197
1953256
1954444
1955888
1956672
1957846
1958516
1959272
1960585
1961254
1962563
19631,137
1964613
1965247
1966400
19671,923
1968818
1969828
1970547
1971680
1972651
19731,292
1974374
1975548
1976446
1977470
1978517
1979558
1980726
19811,476
1982702
19833,324
19841,012
1985979
1986404
1987775
1988717
19893,203
19902,701
19911,125
1992751
1993967
1994793
1995878
19961,114
1997810
19981,142
1999851
2000944
2001650
2002579
20031,103
2004675
2005606
20061,443
2007946
20081,062
20091,097
20102,039
2011653
2012759
20131,029
2014878
20151,173
2016543
2017459
2018742
2019755
2020965
2021323
2022528
20231,170
2024778
20251,099

Download the Data

  • Data for records on 1917-12-21: 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).