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Weather Records on 21 April 1917

48 weather records were set or tied worldwide on 21 April 1917. Highest significance: Botany No.1 Dam, AU.

Key Facts for 21 April 1917

  • On 21 April 1917, 48 weather records were set or tied at long-record stations worldwide.
  • 12 were record highs and 7 were record lows, counting maximum and minimum temperature.
  • By timescale, 0 were all-time records, 1 monthly and 47 daily.
  • Botany No.1 Dam set a daily record precipitation of 83.1 mm (3.3 in) on 21 April 1917.
  • Across 159 earlier years (1793 to 2026) the same calendar date averaged 465 records.

Record Map

48 stations
Weather records on 21 April 1917 48 station records on 21 April 1917 are marked on the map, coloured by record type.
48 station records on 21 April 1917 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.
Weather records on 21 April 1917: highest significance records shown on the map
StationCountryTypeValueSignificance
Botany No.1 DamAustraliaRecord daily precipitation83.1 mm (3.3 in)44 of 100 (Notable)
Burwood 1AustraliaRecord daily precipitation41.9 mm (1.6 in)36 of 100 (Notable)
Prospect ReservoirAustraliaRecord daily precipitation39.4 mm (1.6 in)35 of 100 (Notable)
Epping Chester StreetAustraliaRecord daily precipitation41.4 mm (1.6 in)33 of 100 (Routine)
Sydney (Observatory Hill)AustraliaRecord daily precipitation45.7 mm (1.8 in)21 of 100 (Routine)
Glenfield (Macquarie)AustraliaRecord daily precipitation34.3 mm (1.4 in)21 of 100 (Routine)
Nicola LakeCanadaRecord daily precipitation10.2 mm (0.4 in)20 of 100 (Routine)
KisinevMoldovaRecord daily precipitation15.3 mm (0.6 in)20 of 100 (Routine)
Morris W Cntrl Rsch & OutreachUnited StatesRecord daily precipitation24.1 mm (0.9 in)20 of 100 (Routine)
Camden Bowling ClubAustraliaRecord daily precipitation30.7 mm (1.2 in)20 of 100 (Routine)
Newcastle Nobbys Signal StatioAustraliaRecord daily precipitation54.9 mm (2.2 in)19 of 100 (Routine)
Menangle JmaiAustraliaRecord daily precipitation42.7 mm (1.7 in)19 of 100 (Routine)
PeterboroughCanadaRecord high minimum temperature13.9 C (57.0 F)19 of 100 (Routine)
Picton Council DepotAustraliaRecord daily precipitation43.4 mm (1.7 in)17 of 100 (Routine)
Kingston Queens UCanadaRecord high minimum temperature8.3 C (46.9 F)16 of 100 (Routine)
NurnbergGermanyRecord low maximum temperature5.8 C (42.4 F)16 of 100 (Routine)
UmeaSwedenRecord daily precipitation7.4 mm (0.29 in)15 of 100 (Routine)
Gotska SandonSwedenRecord daily precipitation11.8 mm (0.5 in)15 of 100 (Routine)
Branxton Post OfficeAustraliaRecord daily precipitation17.5 mm (0.7 in)14 of 100 (Routine)
Pitt Town (the Manse)AustraliaRecord daily precipitation14.0 mm (0.6 in)14 of 100 (Routine)
StonecliffeCanadaRecord high minimum temperature6.7 C (44.1 F)14 of 100 (Routine)
AltonCanadaRecord high minimum temperature8.9 C (48.0 F)14 of 100 (Routine)
Gosford (Gertrude Place)AustraliaRecord daily precipitation29.0 mm (1.1 in)13 of 100 (Routine)
Munchen-NymphenburgGermanyRecord low maximum temperature4.9 C (40.8 F)13 of 100 (Routine)
Cataract RiverAustraliaRecord daily precipitation35.6 mm (1.4 in)12 of 100 (Routine)
Holmogadd ASwedenRecord daily precipitation7.3 mm (0.29 in)12 of 100 (Routine)
HambantotaSri LankaRecord high minimum temperature26.8 C (80.2 F)11 of 100 (Routine)
Sevastopol',MgsUkraineRecord daily precipitation2.1 mm (0.08 in)11 of 100 (Routine)
Philadelphia CityUnited StatesRecord high maximum temperature26.7 C (80.1 F)11 of 100 (Routine)
LichtentanneGermanyRecord daily precipitation15.7 mm (0.6 in)10 of 100 (Routine)
Orskar_ASwedenRecord daily precipitation5.1 mm (0.20 in)10 of 100 (Routine)
Emu PlainsAustraliaRecord daily precipitation23.6 mm (0.9 in)8 of 100 (Routine)
HvarCroatiaRecord low minimum temperature7.1 C (44.8 F)8 of 100 (Routine)
Crown St. ReservoirAustraliaRecord daily precipitation55.4 mm (2.2 in)7 of 100 (Routine)
Wrixum/FohrGermanyRecord low maximum temperature6.2 C (43.2 F)7 of 100 (Routine)
Olands Norra UddeSwedenRecord daily precipitation8.8 mm (0.35 in)7 of 100 (Routine)
Berry Masonic VillageAustraliaRecord daily precipitation20.3 mm (0.8 in)6 of 100 (Routine)
Nuwara EliyaSri LankaRecord high maximum temperature26.1 C (79.0 F)6 of 100 (Routine)
LenoirUnited StatesRecord daily precipitation1.8 mm (0.07 in)5 of 100 (Routine)
Greenville Dwtn APUnited StatesRecord high maximum temperature32.2 C (90.0 F)5 of 100 (Routine)
BambergGermanyRecord low maximum temperature7.0 C (44.6 F)3 of 100 (Routine)
Campbelltown 1AustraliaRecord daily precipitation23.9 mm (0.9 in)2 of 100 (Routine)
AltonCanadaRecord high maximum temperature22.2 C (72.0 F)2 of 100 (Routine)
Vasteras-HassloSwedenRecord low maximum temperature3.0 C (37.4 F)2 of 100 (Routine)
Wilmington Wb CityUnited StatesRecord high maximum temperature31.7 C (89.1 F)2 of 100 (Routine)
KarlshamnSwedenRecord low maximum temperature4.0 C (39.2 F)1 of 100 (Routine)
WashingtonUnited StatesRecord high maximum temperature29.4 C (84.9 F)1 of 100 (Routine)
VinelandUnited StatesRecord high maximum temperature29.4 C (84.9 F)0 of 100 (Routine)

Counts by Type and Timescale

48 records
Records on 21 April 1917 by type Records set or tied on 21 April 1917 by type: Highest daily maximum 7, Lowest daily maximum 6, Highest daily minimum 5, Lowest daily minimum 1, Heaviest daily rainfall 29. 0102030Highest daily maximum: 7Lowest daily maximum: 6Highest daily minimum: 5Lowest daily minimum: 1Heaviest daily rainfall: 29Heaviest daily snowfall: 0Deepest snow cover: 0Max highMax lowMin highMin lowRainSnowDepth
Records set or tied on 21 April 1917 by type: Highest daily maximum 7, Lowest daily maximum 6, Highest daily minimum 5, Lowest daily minimum 1, Heaviest daily rainfall 29.
Records on 21 April 1917 by type
Record typeRecords
Highest daily maximum7
Lowest daily maximum6
Highest daily minimum5
Lowest daily minimum1
Heaviest daily rainfall29
Heaviest daily snowfall0
Deepest snow cover0
Records on 21 April 1917 by timescale Records on 21 April 1917 by timescale: all-time 0, monthly 1, daily 47. 0204060all-time: 0monthly: 1daily: 47all-timemonthlydaily
Records on 21 April 1917 by timescale: all-time 0, monthly 1, daily 47.
Records on 21 April 1917 by timescale
TimescaleRecords
all-time0
monthly1
daily47

How Much Records Were Beaten By

39 broken records
Histogram of margins by which records were beaten on 21 April 1917 Margins by which the 39 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 50.6. Ties are not counted. 01020300 to 10: 2710 to 20: 720 to 30: 130 to 40: 340 to 50: 050 to 60: 10 to 1010 to 2020 to 3030 to 4040 to 5050 to 60
Margins by which the 39 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 50.6. Ties are not counted.
Histogram of margins by which records were beaten on 21 April 1917
MarginRecords
0 to 1027
10 to 207
20 to 301
30 to 403
40 to 500
50 to 601

Top 20 by Significance

21 April 1917
Top 20 records on 21 April 1917 by significance
DateStationRecordValueBeat old record byOld record stoodSignificance
21 April 1917Botany No.1 Dam, AUdaily rain83.1 mm (3.3 in)50.6 mm (2.0 in)34 years44 of 100 (Notable)
21 April 1917Burwood 1, AUdaily rain41.9 mm (1.6 in)35.5 mm (1.4 in)31 years36 of 100 (Notable)
21 April 1917Prospect Reservoir, AUdaily rain39.4 mm (1.6 in)30.0 mm (1.2 in)25 years35 of 100 (Notable)
21 April 1917Epping Chester Street, AUdaily rain41.4 mm (1.6 in)30.5 mm (1.2 in)24 years33 of 100 (Routine)
21 April 1917Sydney (Observatory Hill), AUdaily rain45.7 mm (1.8 in)29.2 mm (1.1 in)4 years21 of 100 (Routine)
21 April 1917Glenfield (Macquarie), AUdaily rain34.3 mm (1.4 in)16.5 mm (0.6 in)16 years21 of 100 (Routine)
21 April 1917Nicola Lake, CAdaily rain10.2 mm (0.4 in)5.6 mm (0.22 in)19 years20 of 100 (Routine)
21 April 1917Kisinev, MDdaily rain15.3 mm (0.6 in)10.3 mm (0.4 in)25 years20 of 100 (Routine)
21 April 1917Morris W Cntrl Rsch & Outreach, USdaily rain24.1 mm (0.9 in)15.7 mm (0.6 in)25 years20 of 100 (Routine)
21 April 1917Camden Bowling Club, AUdaily rain30.7 mm (1.2 in)19.0 mm (0.7 in)25 years20 of 100 (Routine)
21 April 1917Newcastle Nobbys Signal Statio, AUdaily rain54.9 mm (2.2 in)11.0 mm (0.4 in)23 years19 of 100 (Routine)
21 April 1917Menangle Jmai, AUdaily rain42.7 mm (1.7 in)13.2 mm (0.5 in)16 years19 of 100 (Routine)
21 April 1917Peterborough, CAdaily high min13.9 C (57.0 F)3.9 C (7.0 F)20 years19 of 100 (Routine)
21 April 1917Picton Council Depot, AUdaily rain43.4 mm (1.7 in)14.2 mm (0.6 in)16 years17 of 100 (Routine)
21 April 1917Kingston Queens U, CAdaily high min8.3 C (46.9 F)0.5 C (0.9 F)38 years16 of 100 (Routine)
21 April 1917Nurnberg, DEdaily low max5.8 C (42.4 F)2.1 C (3.8 F)32 years16 of 100 (Routine)
21 April 1917Umea, SEdaily rain7.4 mm (0.29 in)2.4 mm (0.09 in)14 years15 of 100 (Routine)
21 April 1917Gotska Sandon, SEdaily rain11.8 mm (0.5 in)3.9 mm (0.15 in)8 years15 of 100 (Routine)
21 April 1917Branxton Post Office, AUdaily rain17.5 mm (0.7 in)5.1 mm (0.20 in)23 years14 of 100 (Routine)
21 April 1917Pitt Town (the Manse), AUdaily rain14.0 mm (0.6 in)4.1 mm (0.16 in)25 years14 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 04-21 in each year Records set or tied on this calendar date in each year from 1793 to 1917. 1917 had 48 records. 05001,0001,5002,0001793: 11814: 11820: 11838: 11849: 21851: 11852: 31854: 11858: 31861: 21865: 31866: 11868: 11870: 11875: 41876: 21877: 11879: 31880: 11881: 11882: 11884: 11885: 21888: 11890: 11891: 11892: 11893: 21894: 41895: 11897: 11898: 21899: 21900: 71901: 171902: 71903: 31904: 101905: 181906: 51907: 171908: 251909: 201910: 331911: 91912: 221913: 141914: 2201915: 241916: 641917: 481918: 841919: 311920: 851921: 591922: 701923: 2231924: 1191925: 2951926: 1481927: 2841928: 2691929: 1931930: 1271931: 3581932: 3041933: 2011934: 4971935: 2661936: 2771937: 4161938: 2951939: 1101940: 4621941: 3061942: 2851943: 4811944: 2611945: 3671946: 4481947: 4591948: 3651949: 4481950: 5291951: 8841952: 6651953: 6401954: 5271955: 6071956: 4971957: 8241958: 3291959: 5051960: 8891961: 6471962: 3191963: 7781964: 1,1251965: 6581966: 7561967: 9031968: 6551969: 3881970: 7281971: 5461972: 5931973: 1,1631974: 5281975: 3601976: 4521977: 8541978: 7351979: 4491980: 1,9341981: 9441982: 1,0751983: 1,3661984: 1,2311985: 1,2451986: 9771987: 1,2901988: 8981989: 1,5571990: 1,4631991: 1,2911992: 1,7631993: 8471994: 8591995: 1,4761996: 7881997: 9641998: 8761999: 7522000: 9212001: 9672002: 1,3122003: 6072004: 5862005: 6932006: 7612007: 4802008: 1,3272009: 9832010: 8052011: 1,0532012: 6872013: 1,0152014: 3932015: 6212016: 5872017: 7972018: 8622019: 7312020: 3972021: 1,6082022: 4332023: 8862024: 7542025: 5062026: 8531793187718991915193119471963197919952011
Records set or tied on this calendar date in each year from 1793 to 1917. 1917 had 48 records.
Counts for years before the ledger starts come from the same station rules.
Records on 04-21 in each year
YearRecords
17931
18141
18201
18381
18492
18511
18523
18541
18583
18612
18653
18661
18681
18701
18754
18762
18771
18793
18801
18811
18821
18841
18852
18881
18901
18911
18921
18932
18944
18951
18971
18982
18992
19007
190117
19027
19033
190410
190518
19065
190717
190825
190920
191033
19119
191222
191314
1914220
191524
191664
191748
191884
191931
192085
192159
192270
1923223
1924119
1925295
1926148
1927284
1928269
1929193
1930127
1931358
1932304
1933201
1934497
1935266
1936277
1937416
1938295
1939110
1940462
1941306
1942285
1943481
1944261
1945367
1946448
1947459
1948365
1949448
1950529
1951884
1952665
1953640
1954527
1955607
1956497
1957824
1958329
1959505
1960889
1961647
1962319
1963778
19641,125
1965658
1966756
1967903
1968655
1969388
1970728
1971546
1972593
19731,163
1974528
1975360
1976452
1977854
1978735
1979449
19801,934
1981944
19821,075
19831,366
19841,231
19851,245
1986977
19871,290
1988898
19891,557
19901,463
19911,291
19921,763
1993847
1994859
19951,476
1996788
1997964
1998876
1999752
2000921
2001967
20021,312
2003607
2004586
2005693
2006761
2007480
20081,327
2009983
2010805
20111,053
2012687
20131,015
2014393
2015621
2016587
2017797
2018862
2019731
2020397
20211,608
2022433
2023886
2024754
2025506
2026853

Download the Data

  • Data for records on 1917-04-21: 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).