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Weather Records on 20 December 1917

33 weather records were set or tied worldwide on 20 December 1917. Highest significance: Perth Regional Office, AU.

Key Facts for 20 December 1917

  • On 20 December 1917, 33 weather records were set or tied at long-record stations worldwide.
  • 7 were record highs and 7 were record lows, counting maximum and minimum temperature.
  • By timescale, 0 were all-time records, 0 monthly and 33 daily.
  • Perth Regional Office set a daily record precipitation of 21.3 mm (0.8 in) on 20 December 1917.
  • Across 163 earlier years (1793 to 2025) the same calendar date averaged 470 records.

Record Map

33 stations
Weather records on 20 December 1917 33 station records on 20 December 1917 are marked on the map, coloured by record type.
33 station records on 20 December 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.
Weather records on 20 December 1917: highest significance records shown on the map
StationCountryTypeValueSignificance
Perth Regional OfficeAustraliaRecord daily precipitation21.3 mm (0.8 in)20 of 100 (Routine)
FalunSwedenRecord daily precipitation13.4 mm (0.5 in)20 of 100 (Routine)
Vasteras-HassloSwedenRecord daily precipitation9.5 mm (0.37 in)20 of 100 (Routine)
OrebroSwedenRecord daily precipitation8.1 mm (0.32 in)20 of 100 (Routine)
GoglandRussiaRecord daily precipitation8.8 mm (0.35 in)20 of 100 (Routine)
MahackalaRussiaRecord daily precipitation13.7 mm (0.5 in)20 of 100 (Routine)
Fort NationalAlgeriaRecord low minimum temperature-2.0 C (28.4 F)18 of 100 (Routine)
MagdeburgGermanyRecord low maximum temperature-4.8 C (23.4 F)17 of 100 (Routine)
Nemours (Ghazaouet)AlgeriaRecord low maximum temperature13.0 C (55.4 F)16 of 100 (Routine)
BicCanadaRecord daily snowfall7.6 cm (3.0 in)16 of 100 (Routine)
Uppsala_AutSwedenRecord daily precipitation9.1 mm (0.36 in)16 of 100 (Routine)
BjurakerSwedenRecord daily precipitation6.2 mm (0.24 in)16 of 100 (Routine)
MalungSwedenRecord daily precipitation9.7 mm (0.38 in)15 of 100 (Routine)
Fort NationalAlgeriaRecord low maximum temperature3.0 C (37.4 F)14 of 100 (Routine)
Dohne (Sar)South AfricaRecord daily precipitation32.8 mm (1.3 in)13 of 100 (Routine)
Santa FeUnited StatesRecord high maximum temperature12.8 C (55.0 F)13 of 100 (Routine)
Algiers-Ville/UniversiteAlgeriaRecord low maximum temperature11.0 C (51.8 F)12 of 100 (Routine)
Robe ComparisonAustraliaRecord high maximum temperature32.5 C (90.5 F)12 of 100 (Routine)
GrenfellCanadaRecord daily precipitation2.5 mm (0.10 in)12 of 100 (Routine)
GrenfellCanadaRecord daily snowfall2.5 cm (1.0 in)12 of 100 (Routine)
OttawaCanadaRecord high minimum temperature0.6 C (33.1 F)12 of 100 (Routine)
BicCanadaRecord daily precipitation7.6 mm (0.30 in)11 of 100 (Routine)
MagdeburgGermanyRecord low minimum temperature-9.4 C (15.1 F)11 of 100 (Routine)
Algiers-Ville/UniversiteAlgeriaRecord low minimum temperature7.0 C (44.6 F)10 of 100 (Routine)
HaldenNorwayRecord daily precipitation19.4 mm (0.8 in)10 of 100 (Routine)
AltastenbergGermanyRecord high maximum temperature6.6 C (43.9 F)9 of 100 (Routine)
Murray Town (Doughboy Creek)AustraliaRecord daily precipitation3.8 mm (0.15 in)8 of 100 (Routine)
Port Elliot Caravan ParkAustraliaRecord daily precipitation5.1 mm (0.20 in)7 of 100 (Routine)
Cape Moreton LighthouseAustraliaRecord daily precipitation20.3 mm (0.8 in)7 of 100 (Routine)
ArhangelskRussiaRecord daily precipitation6.0 mm (0.24 in)3 of 100 (Routine)
San Diego WboUnited StatesRecord high maximum temperature23.3 C (73.9 F)2 of 100 (Routine)
Houston Wb CityUnited StatesRecord high minimum temperature11.1 C (52.0 F)2 of 100 (Routine)
Winnemucca APUnited StatesRecord high maximum temperature13.9 C (57.0 F)2 of 100 (Routine)

Counts by Type and Timescale

33 records
Records on 20 December 1917 by type Records set or tied on 20 December 1917 by type: Highest daily maximum 5, Lowest daily maximum 4, Highest daily minimum 2, Lowest daily minimum 3, Heaviest daily rainfall 17, Heaviest daily snowfall 2. 05101520Highest daily maximum: 5Lowest daily maximum: 4Highest daily minimum: 2Lowest daily minimum: 3Heaviest daily rainfall: 17Heaviest daily snowfall: 2Deepest snow cover: 0Max highMax lowMin highMin lowRainSnowDepth
Records set or tied on 20 December 1917 by type: Highest daily maximum 5, Lowest daily maximum 4, Highest daily minimum 2, Lowest daily minimum 3, Heaviest daily rainfall 17, Heaviest daily snowfall 2.
Records on 20 December 1917 by type
Record typeRecords
Highest daily maximum5
Lowest daily maximum4
Highest daily minimum2
Lowest daily minimum3
Heaviest daily rainfall17
Heaviest daily snowfall2
Deepest snow cover0
Records on 20 December 1917 by timescale Records on 20 December 1917 by timescale: all-time 0, monthly 0, daily 33. 010203040all-time: 0monthly: 0daily: 33all-timemonthlydaily
Records on 20 December 1917 by timescale: all-time 0, monthly 0, daily 33.
Records on 20 December 1917 by timescale
TimescaleRecords
all-time0
monthly0
daily33

How Much Records Were Beaten By

29 broken records
Histogram of margins by which records were beaten on 20 December 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 76.0. Ties are not counted. 01020300 to 10: 2610 to 20: 120 to 30: 130 to 40: 040 to 50: 050 to 60: 060 to 70: 070 to 80: 10 to 1010 to 2020 to 3030 to 4040 to 5050 to 6060 to 7070 to 80
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 76.0. Ties are not counted.
Histogram of margins by which records were beaten on 20 December 1917
MarginRecords
0 to 1026
10 to 201
20 to 301
30 to 400
40 to 500
50 to 600
60 to 700
70 to 801

Top 20 by Significance

20 December 1917
Top 20 records on 20 December 1917 by significance
DateStationRecordValueBeat old record byOld record stoodSignificance
20 December 1917Perth Regional Office, AUdaily rain21.3 mm (0.8 in)17.7 mm (0.7 in)23 years20 of 100 (Routine)
20 December 1917Falun, SEdaily rain13.4 mm (0.5 in)6.7 mm (0.26 in)35 years20 of 100 (Routine)
20 December 1917Vasteras-Hasslo, SEdaily rain9.5 mm (0.37 in)3.1 mm (0.12 in)47 years20 of 100 (Routine)
20 December 1917Orebro, SEdaily rain8.1 mm (0.32 in)3.6 mm (0.14 in)42 years20 of 100 (Routine)
20 December 1917Gogland, RUdaily rain8.8 mm (0.35 in)2.3 mm (0.09 in)32 years20 of 100 (Routine)
20 December 1917Mahackala, RUdaily rain13.7 mm (0.5 in)4.5 mm (0.18 in)24 years20 of 100 (Routine)
20 December 1917Fort National, DZdaily low min-2.0 C (28.4 F)2.0 C (3.6 F)27 years18 of 100 (Routine)
20 December 1917Magdeburg, DEdaily low max-4.8 C (23.4 F)3.1 C (5.6 F)25 years17 of 100 (Routine)
20 December 1917Nemours (Ghazaouet), DZdaily low max13.0 C (55.4 F)1.0 C (1.8 F)27 years16 of 100 (Routine)
20 December 1917Bic, CAdaily snowfall7.6 cm (3.0 in)7.6 cm (3.0 in)12 years16 of 100 (Routine)
20 December 1917Uppsala_Aut, SEdaily rain9.1 mm (0.36 in)2.7 mm (0.11 in)3 years16 of 100 (Routine)
20 December 1917Bjuraker, SEdaily rain6.2 mm (0.24 in)2.7 mm (0.11 in)18 years16 of 100 (Routine)
20 December 1917Malung, SEdaily rain9.7 mm (0.38 in)3.0 mm (0.12 in)16 years15 of 100 (Routine)
20 December 1917Fort National, DZdaily low max3.0 C (37.4 F)2.0 C (3.6 F)21 years14 of 100 (Routine)
20 December 1917Dohne (Sar), ZAdaily rain32.8 mm (1.3 in)3.8 mm (0.15 in)25 years13 of 100 (Routine)
20 December 1917Santa Fe, USdaily high max12.8 C (55.0 F)1.7 C (3.1 F)22 years13 of 100 (Routine)
20 December 1917Algiers-Ville/Universite, DZdaily low max11.0 C (51.8 F)0.3 C (0.5 F)27 years12 of 100 (Routine)
20 December 1917Robe Comparison, AUdaily high max32.5 C (90.5 F)1.0 C (1.8 F)24 years12 of 100 (Routine)
20 December 1917Grenfell, CAdaily rain2.5 mm (0.10 in)2.5 mm (0.10 in)16 years12 of 100 (Routine)
20 December 1917Grenfell, CAdaily snowfall2.5 cm (1.0 in)2.5 cm (1.0 in)16 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

1793 to 1917
Records on 12-20 in each year Records set or tied on this calendar date in each year from 1793 to 1917. 1917 had 33 records. 01,0002,0003,0001793: 11795: 11804: 11805: 21808: 11815: 11828: 11837: 11846: 11855: 81858: 11860: 11866: 11867: 11868: 11869: 11871: 21874: 31875: 11877: 21878: 11879: 11880: 11881: 11882: 11884: 41885: 11886: 41889: 41890: 21891: 21892: 11894: 21895: 81896: 11897: 41898: 21899: 11900: 71901: 81902: 141903: 171904: 91905: 51906: 51907: 111908: 51909: 221910: 171911: 241912: 271913: 71914: 431915: 181916: 451917: 331918: 181919: 251920: 221921: 1011922: 881923: 2151924: 3321925: 961926: 1631927: 2001928: 931929: 2561930: 671931: 5361932: 1701933: 4921934: 2651935: 1521936: 4161937: 1811938: 2401939: 3081940: 9651941: 6331942: 8171943: 1931944: 3401945: 4301946: 3271947: 3851948: 3451949: 1,1411950: 7581951: 9261952: 3941953: 3851954: 4161955: 7261956: 4711957: 1,3541958: 3821959: 1421960: 3541961: 3691962: 4751963: 8751964: 4991965: 3531966: 5551967: 1,3701968: 4821969: 5141970: 5181971: 4411972: 4481973: 1,1841974: 3281975: 6101976: 3821977: 4841978: 9101979: 6001980: 6671981: 1,6811982: 7121983: 2,9951984: 1,4111985: 1,0351986: 3211987: 1,1791988: 7601989: 1,8121990: 1,8851991: 1,1721992: 1,1341993: 1,2661994: 8131995: 1,1281996: 1,4481997: 6511998: 1,1101999: 9382000: 1,1502001: 5232002: 9432003: 1,3152004: 8362005: 5152006: 1,3872007: 9862008: 1,3562009: 1,5022010: 2,0552011: 8462012: 1,1312013: 5842014: 5242015: 1,2382016: 6032017: 6882018: 5922019: 7312020: 5542021: 4422022: 5672023: 1,2422024: 8972025: 1,1661793187418961913193019471964198119982015
Records set or tied on this calendar date in each year from 1793 to 1917. 1917 had 33 records.
Counts for years before the ledger starts come from the same station rules.
Records on 12-20 in each year
YearRecords
17931
17951
18041
18052
18081
18151
18281
18371
18461
18558
18581
18601
18661
18671
18681
18691
18712
18743
18751
18772
18781
18791
18801
18811
18821
18844
18851
18864
18894
18902
18912
18921
18942
18958
18961
18974
18982
18991
19007
19018
190214
190317
19049
19055
19065
190711
19085
190922
191017
191124
191227
19137
191443
191518
191645
191733
191818
191925
192022
1921101
192288
1923215
1924332
192596
1926163
1927200
192893
1929256
193067
1931536
1932170
1933492
1934265
1935152
1936416
1937181
1938240
1939308
1940965
1941633
1942817
1943193
1944340
1945430
1946327
1947385
1948345
19491,141
1950758
1951926
1952394
1953385
1954416
1955726
1956471
19571,354
1958382
1959142
1960354
1961369
1962475
1963875
1964499
1965353
1966555
19671,370
1968482
1969514
1970518
1971441
1972448
19731,184
1974328
1975610
1976382
1977484
1978910
1979600
1980667
19811,681
1982712
19832,995
19841,411
19851,035
1986321
19871,179
1988760
19891,812
19901,885
19911,172
19921,134
19931,266
1994813
19951,128
19961,448
1997651
19981,110
1999938
20001,150
2001523
2002943
20031,315
2004836
2005515
20061,387
2007986
20081,356
20091,502
20102,055
2011846
20121,131
2013584
2014524
20151,238
2016603
2017688
2018592
2019731
2020554
2021442
2022567
20231,242
2024897
20251,166

Download the Data

  • Data for records on 1917-12-20: 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).