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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Weather Records on 17 May 1863

2 weather records were set or tied worldwide on 17 May 1863. Highest significance: Milan, IT.

Key Facts for 17 May 1863

  • On 17 May 1863, 2 weather records were set or tied at long-record stations worldwide.
  • 2 were record highs and 0 were record lows, counting maximum and minimum temperature.
  • By timescale, 0 were all-time records, 0 monthly and 2 daily.
  • Milan set a daily record high maximum temperature of 31.0 C (87.8 F) on 17 May 1863.
  • Across 166 earlier years (1802 to 2025) the same calendar date averaged 435 records.

Record Map

2 stations
Weather records on 17 May 1863 2 station records on 17 May 1863 are marked on the map, coloured by record type.
2 station records on 17 May 1863 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.
Weather records on 17 May 1863: highest significance records shown on the map
StationCountryTypeValueSignificance
MilanItalyRecord high maximum temperature31.0 C (87.8 F)16 of 100 (Routine)
Jena SternwarteGermanyRecord high maximum temperature28.3 C (82.9 F)12 of 100 (Routine)

Counts by Type and Timescale

2 records
Records on 17 May 1863 by type Records set or tied on 17 May 1863 by type: Highest daily maximum 2. 01122Highest daily maximum: 2Lowest daily maximum: 0Highest daily minimum: 0Lowest daily minimum: 0Heaviest daily rainfall: 0Heaviest daily snowfall: 0Deepest snow cover: 0Max highMax lowMin highMin lowRainSnowDepth
Records set or tied on 17 May 1863 by type: Highest daily maximum 2.
Records on 17 May 1863 by type
Record typeRecords
Highest daily maximum2
Lowest daily maximum0
Highest daily minimum0
Lowest daily minimum0
Heaviest daily rainfall0
Heaviest daily snowfall0
Deepest snow cover0
Records on 17 May 1863 by timescale Records on 17 May 1863 by timescale: all-time 0, monthly 0, daily 2. 01122all-time: 0monthly: 0daily: 2all-timemonthlydaily
Records on 17 May 1863 by timescale: all-time 0, monthly 0, daily 2.
Records on 17 May 1863 by timescale
TimescaleRecords
all-time0
monthly0
daily2

How Much Records Were Beaten By

2 broken records
Histogram of margins by which records were beaten on 17 May 1863 Margins by which the 2 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 2.3. Ties are not counted. 001110.0 to 0.5: 10.5 to 1.0: 01.0 to 1.5: 01.5 to 2.0: 02.0 to 2.5: 10.0 to 0.50.5 to 1.01.0 to 1.51.5 to 2.02.0 to 2.5
Margins by which the 2 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 2.3. Ties are not counted.
Histogram of margins by which records were beaten on 17 May 1863
MarginRecords
0.0 to 0.51
0.5 to 1.00
1.0 to 1.50
1.5 to 2.00
2.0 to 2.51

Top 20 by Significance

17 May 1863
Top 2 records on 17 May 1863 by significance
DateStationRecordValueBeat old record byOld record stoodSignificance
17 May 1863Milan, ITdaily high max31.0 C (87.8 F)2.3 C (4.1 F)1 year16 of 100 (Routine)
17 May 1863Jena Sternwarte, DEdaily high max28.3 C (82.9 F)0.4 C (0.7 F)29 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 1863
Records on 05-17 in each year Records set or tied on this calendar date in each year from 1802 to 1863. 1863 had 2 records. 05001,0001,5002,0001802: 21803: 11808: 11816: 11834: 11837: 11839: 11847: 21848: 11851: 11853: 11855: 11858: 11859: 11861: 21862: 21863: 21864: 11871: 21872: 21873: 21874: 41877: 11878: 11879: 21880: 11881: 11882: 21883: 31885: 11887: 11888: 21889: 31891: 81892: 41893: 31895: 81896: 21897: 31898: 61899: 71900: 121901: 21902: 31903: 91904: 121905: 101906: 221907: 101908: 51909: 331910: 161911: 301912: 161913: 241914: 241915: 531916: 491917: 181918: 561919: 351920: 461921: 501922: 301923: 951924: 801925: 3261926: 1331927: 2641928: 1271929: 1681930: 4211931: 2011932: 2881933: 3651934: 3731935: 3411936: 2701937: 1831938: 3401939: 2851940: 3381941: 4081942: 5891943: 8551944: 5211945: 7991946: 5861947: 2491948: 4121949: 5441950: 3711951: 3731952: 7771953: 4411954: 2981955: 5701956: 1,1661957: 4691958: 3311959: 4881960: 4021961: 2911962: 1,3251963: 3681964: 4171965: 4621966: 4891967: 6441968: 5641969: 6381970: 7111971: 7231972: 6101973: 1,0161974: 1,3021975: 3651976: 4261977: 1,0781978: 8721979: 4591980: 7681981: 9401982: 4761983: 1,3261984: 9251985: 5611986: 9211987: 1,0541988: 1,0961989: 1,3071990: 1,1351991: 1,2371992: 1,0251993: 4951994: 8581995: 1,7341996: 1,7061997: 1,6191998: 1,0801999: 7952000: 8252001: 9602002: 9642003: 1,1272004: 7692005: 7842006: 1,5222007: 7422008: 1,3092009: 1,0502010: 8802011: 1,4832012: 7112013: 7392014: 1,0622015: 8242016: 7412017: 1,3012018: 7232019: 6852020: 4932021: 4422022: 4762023: 3802024: 5662025: 9281802186418921910192719441961197819952012
Records set or tied on this calendar date in each year from 1802 to 1863. 1863 had 2 records.
Counts for years before the ledger starts come from the same station rules.
Records on 05-17 in each year
YearRecords
18022
18031
18081
18161
18341
18371
18391
18472
18481
18511
18531
18551
18581
18591
18612
18622
18632
18641
18712
18722
18732
18744
18771
18781
18792
18801
18811
18822
18833
18851
18871
18882
18893
18918
18924
18933
18958
18962
18973
18986
18997
190012
19012
19023
19039
190412
190510
190622
190710
19085
190933
191016
191130
191216
191324
191424
191553
191649
191718
191856
191935
192046
192150
192230
192395
192480
1925326
1926133
1927264
1928127
1929168
1930421
1931201
1932288
1933365
1934373
1935341
1936270
1937183
1938340
1939285
1940338
1941408
1942589
1943855
1944521
1945799
1946586
1947249
1948412
1949544
1950371
1951373
1952777
1953441
1954298
1955570
19561,166
1957469
1958331
1959488
1960402
1961291
19621,325
1963368
1964417
1965462
1966489
1967644
1968564
1969638
1970711
1971723
1972610
19731,016
19741,302
1975365
1976426
19771,078
1978872
1979459
1980768
1981940
1982476
19831,326
1984925
1985561
1986921
19871,054
19881,096
19891,307
19901,135
19911,237
19921,025
1993495
1994858
19951,734
19961,706
19971,619
19981,080
1999795
2000825
2001960
2002964
20031,127
2004769
2005784
20061,522
2007742
20081,309
20091,050
2010880
20111,483
2012711
2013739
20141,062
2015824
2016741
20171,301
2018723
2019685
2020493
2021442
2022476
2023380
2024566
2025928

Download the Data

  • Data for records on 1863-05-17: 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 2026-10-18 (18 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).