Weather Records on 18 April 1991

780 weather records were set or tied worldwide on 18 April 1991. Highest significance: Khartoum, SD.

Key Facts for 18 April 1991

On 18 April 1991, 780 weather records were set or tied at long-record stations worldwide.
267 were record highs and 222 were record lows, counting maximum and minimum temperature.
By timescale, 6 were all-time records, 25 monthly and 749 daily.
Khartoum set a monthly record daily precipitation of 59.9 mm (2.4 in) on 18 April 1991.
Across 160 earlier years (1793 to 2026) the same calendar date averaged 465 records.

Record Map

780 stations

780 station records on 18 April 1991 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 April 1991: highest significance records shown on the map
Station	Country	Type	Value	Significance
Khartoum	Sudan	Record daily precipitation	59.9 mm (2.4 in)	60 of 100 (Major)
Natchitoches	United States	Record daily precipitation	144.8 mm (5.7 in)	58 of 100 (Notable)
Stilwell	United States	Record daily precipitation	125.7 mm (4.9 in)	56 of 100 (Notable)
Pesaro	Italy	Record daily precipitation	43.7 mm (1.7 in)	55 of 100 (Notable)
Ozone	United States	Record daily precipitation	99.1 mm (3.9 in)	50 of 100 (Notable)
Mystic Lake	United States	Record snow depth	152.4 cm (60.0 in)	50 of 100 (Notable)
Center	United States	Record daily precipitation	165.9 mm (6.5 in)	50 of 100 (Notable)
Worland Muni AP	United States	Record daily snowfall	24.4 cm (9.6 in)	50 of 100 (Notable)
Grass Range	United States	Record daily precipitation	29.2 mm (1.1 in)	49 of 100 (Notable)
Des Moines Intl AP	United States	Record daily precipitation	64.8 mm (2.6 in)	49 of 100 (Notable)
Bologna	Italy	Record daily precipitation	29.2 mm (1.1 in)	48 of 100 (Notable)
Matao	Brazil	Record daily precipitation	80.0 mm (3.1 in)	45 of 100 (Notable)
Pocahontas 1	United States	Record daily precipitation	49.3 mm (1.9 in)	45 of 100 (Notable)
Albany 3 SE	United States	Record daily precipitation	52.1 mm (2.1 in)	45 of 100 (Notable)
Oswego 1 N	United States	Record daily precipitation	45.7 mm (1.8 in)	44 of 100 (Notable)
Jerome	United States	Record daily precipitation	26.4 mm (1.0 in)	44 of 100 (Notable)
Columbus	United States	Record daily precipitation	48.3 mm (1.9 in)	43 of 100 (Notable)
Sarutaia (US.Boa Vista-Clfsc)	Brazil	Record daily precipitation	53.5 mm (2.1 in)	42 of 100 (Notable)
Milan	Italy	Record low maximum temperature	7.0 C (44.6 F)	42 of 100 (Notable)
Diversion Dam	United States	Record daily snowfall	30.5 cm (12.0 in)	42 of 100 (Notable)
Sisian	Armenia	Record daily precipitation	26.6 mm (1.0 in)	41 of 100 (Notable)
Bologna	Italy	Record low minimum temperature	-0.1 C (31.8 F)	41 of 100 (Notable)
Lakeside	United States	Record daily precipitation	58.7 mm (2.3 in)	41 of 100 (Notable)
Pawhuska	United States	Record daily precipitation	62.2 mm (2.4 in)	41 of 100 (Notable)
Val de Palmas	Brazil	Record daily precipitation	69.4 mm (2.7 in)	40 of 100 (Notable)
Clearmont 5 SW	United States	Record daily precipitation	29.5 mm (1.2 in)	40 of 100 (Notable)
Emblem	United States	Record daily snowfall	21.6 cm (8.5 in)	40 of 100 (Notable)
Graz	Austria	Record low maximum temperature	3.4 C (38.1 F)	39 of 100 (Notable)
Porto Ermidao (Faz.Harmonia)	Brazil	Record daily precipitation	78.8 mm (3.1 in)	39 of 100 (Notable)
Diversion Dam	United States	Record daily precipitation	29.5 mm (1.2 in)	39 of 100 (Notable)
Cody	United States	Record snow depth	22.9 cm (9.0 in)	38 of 100 (Notable)
Thermopolis 21WNW	United States	Record daily snowfall	35.6 cm (14.0 in)	38 of 100 (Notable)
Eureka Springs 3 WNW	United States	Record daily precipitation	48.5 mm (1.9 in)	37 of 100 (Notable)
Lake City 2 E	United States	Record daily precipitation	28.4 mm (1.1 in)	37 of 100 (Notable)
Red Lodge	United States	Record snow depth	180.3 cm (71.0 in)	37 of 100 (Notable)
Broken Bow 1 N	United States	Record daily precipitation	70.6 mm (2.8 in)	36 of 100 (Notable)
Dona Francisca (Pcd)	Brazil	Record daily precipitation	164.8 mm (6.5 in)	35 of 100 (Notable)
Marilia	Brazil	Record daily precipitation	52.6 mm (2.1 in)	35 of 100 (Notable)
Szombathely	Hungary	Record low maximum temperature	4.8 C (40.6 F)	35 of 100 (Notable)
Ashland	United States	Record daily precipitation	87.4 mm (3.4 in)	35 of 100 (Notable)
Ljubljana Bezigrad	Slovenia	Record low maximum temperature	3.4 C (38.1 F)	34 of 100 (Routine)
Gibson 2 NE	United States	Record snow depth	27.9 cm (11.0 in)	34 of 100 (Routine)
Passo Socorro (Pcd)	Brazil	Record daily precipitation	57.6 mm (2.3 in)	32 of 100 (Routine)
Wenzhou	China	Record daily precipitation	40.8 mm (1.6 in)	32 of 100 (Routine)
Sunndalsora III	Norway	Record snow depth	18.0 cm (7.1 in)	32 of 100 (Routine)
Vila Canoas	Brazil	Record daily precipitation	50.0 mm (2.0 in)	31 of 100 (Routine)
Zhijiang	China	Record daily precipitation	52.2 mm (2.1 in)	31 of 100 (Routine)
Hanty-Mansijsk	Russia	Record high minimum temperature	8.4 C (47.1 F)	31 of 100 (Routine)
Galena	United States	Record daily precipitation	69.3 mm (2.7 in)	31 of 100 (Routine)
Lexington 3E	United States	Record daily precipitation	46.0 mm (1.8 in)	31 of 100 (Routine)
Waynesville 2 W	United States	Record daily precipitation	57.9 mm (2.3 in)	31 of 100 (Routine)
El Quelite (Cfe)	Mexico	Record high maximum temperature	41.1 C (106.0 F)	30 of 100 (Routine)
Lamoni	United States	Record daily precipitation	44.7 mm (1.8 in)	30 of 100 (Routine)
Burnet	United States	Record daily precipitation	37.1 mm (1.5 in)	30 of 100 (Routine)
Jarrell	United States	Record daily precipitation	32.5 mm (1.3 in)	30 of 100 (Routine)
Snake Rvr	United States	Record daily snowfall	7.6 cm (3.0 in)	30 of 100 (Routine)
Schierke	Germany	Record low minimum temperature	-7.2 C (19.0 F)	29 of 100 (Routine)
Jakutsk	Russia	Record low maximum temperature	-9.7 C (14.5 F)	29 of 100 (Routine)
Cangucu	Brazil	Record daily precipitation	58.0 mm (2.3 in)	28 of 100 (Routine)
Bordeaux-Merignac	France	Record low maximum temperature	10.2 C (50.4 F)	28 of 100 (Routine)

Counts by Type and Timescale

780 records

Records set or tied on 18 April 1991 by type: Highest daily maximum 157, Lowest daily maximum 121, Highest daily minimum 110, Lowest daily minimum 101, Heaviest daily rainfall 249, Heaviest daily snowfall 16, Deepest snow cover 26.

Records on 18 April 1991 by type
Record type	Records
Highest daily maximum	157
Lowest daily maximum	121
Highest daily minimum	110
Lowest daily minimum	101
Heaviest daily rainfall	249
Heaviest daily snowfall	16
Deepest snow cover	26

Records on 18 April 1991 by timescale: all-time 6, monthly 25, daily 749.

How Much Records Were Beaten By

633 broken records

Margins by which the 633 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 914.0. Ties are not counted.

Top 20 by Significance

18 April 1991

Top 20 records on 18 April 1991 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 April 1991	Khartoum, SD	monthly rain	59.9 mm (2.4 in)	48.1 mm (1.9 in)	23 years	60 of 100 (Major)
18 April 1991	Natchitoches, US	daily rain	144.8 mm (5.7 in)	107.0 mm (4.2 in)	32 years	58 of 100 (Notable)
18 April 1991	Stilwell, US	monthly rain	125.7 mm (4.9 in)	42.4 mm (1.7 in)	31 years	56 of 100 (Notable)
18 April 1991	Pesaro, IT	daily rain	43.7 mm (1.7 in)	20.5 mm (0.8 in)	52 years	55 of 100 (Notable)
18 April 1991	Ozone, US	daily rain	99.1 mm (3.9 in)	78.8 mm (3.1 in)	2 years	50 of 100 (Notable)
18 April 1991	Mystic Lake, US	daily snow depth	152.4 cm (60.0 in)	91.4 cm (36.0 in)	16 years	50 of 100 (Notable)
18 April 1991	Center, US	daily rain	165.9 mm (6.5 in)	104.9 mm (4.1 in)	12 years	50 of 100 (Notable)
18 April 1991	Worland Muni AP, US	daily snowfall	24.4 cm (9.6 in)	19.6 cm (7.7 in)	24 years	50 of 100 (Notable)
18 April 1991	Grass Range, US	daily rain	29.2 mm (1.1 in)	18.0 mm (0.7 in)	40 years	49 of 100 (Notable)
18 April 1991	Des Moines Intl AP, US	daily rain	64.8 mm (2.6 in)	40.4 mm (1.6 in)	28 years	49 of 100 (Notable)
18 April 1991	Bologna, IT	daily rain	29.2 mm (1.1 in)	7.2 mm (0.28 in)	113 years	48 of 100 (Notable)
18 April 1991	Matao, BR	daily rain	80.0 mm (3.1 in)	59.4 mm (2.3 in)	0 years	45 of 100 (Notable)
18 April 1991	Pocahontas 1, US	daily rain	49.3 mm (1.9 in)	17.0 mm (0.7 in)	80 years	45 of 100 (Notable)
18 April 1991	Albany 3 SE, US	daily rain	52.1 mm (2.1 in)	22.1 mm (0.9 in)	78 years	45 of 100 (Notable)
18 April 1991	Oswego 1 N, US	daily rain	45.7 mm (1.8 in)	17.8 mm (0.7 in)	76 years	44 of 100 (Notable)
18 April 1991	Jerome, US	daily rain	26.4 mm (1.0 in)	6.6 mm (0.26 in)	98 years	44 of 100 (Notable)
18 April 1991	Columbus, US	daily rain	48.3 mm (1.9 in)	19.9 mm (0.8 in)	64 years	43 of 100 (Notable)
18 April 1991	Sarutaia (US.Boa Vista-Clfsc), BR	daily rain	53.5 mm (2.1 in)	37.3 mm (1.5 in)	32 years	42 of 100 (Notable)
18 April 1991	Milan, IT	daily low max	7.0 C (44.6 F)	1.1 C (2.0 F)	183 years	42 of 100 (Notable)
18 April 1991	Diversion Dam, US	monthly snowfall	30.5 cm (12.0 in)	7.6 cm (3.0 in)	38 years	42 of 100 (Notable)

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 1991

Records set or tied on this calendar date in each year from 1793 to 1991. 1991 had 780 records.

Counts for years before the ledger starts come from the same station rules.

Records on 04-18 in each year
Year	Records
1793	1
1807	2
1815	1
1838	1
1847	1
1849	1
1851	1
1852	3
1854	3
1855	1
1865	4
1867	1
1870	1
1871	1
1875	4
1877	2
1878	1
1879	3
1880	2
1884	2
1886	2
1887	3
1888	1
1889	1
1890	2
1891	1
1892	3
1893	5
1894	7
1895	2
1896	3
1897	5
1898	8
1899	2
1900	2
1901	6
1902	5
1903	11
1904	9
1905	12
1906	18
1907	17
1908	37
1909	19
1910	19
1911	25
1912	21
1913	26
1914	38
1915	31
1916	22
1917	40
1918	76
1919	16
1920	64
1921	58
1922	85
1923	107
1924	101
1925	154
1926	322
1927	391
1928	323
1929	126
1930	113
1931	173
1932	326
1933	211
1934	391
1935	264
1936	483
1937	477
1938	711
1939	525
1940	322
1941	496
1942	287
1943	298
1944	259
1945	371
1946	357
1947	444
1948	932
1949	345
1950	244
1951	658
1952	536
1953	1,322
1954	442
1955	817
1956	467
1957	629
1958	370
1959	468
1960	320
1961	520
1962	484
1963	662
1964	449
1965	363
1966	776
1967	882
1968	867
1969	795
1970	771
1971	1,106
1972	470
1973	953
1974	326
1975	751
1976	1,309
1977	717
1978	803
1979	841
1980	842
1981	708
1982	616
1983	2,082
1984	625
1985	1,119
1986	622
1987	1,068
1988	936
1989	625
1990	1,368
1991	780
1992	702
1993	730
1994	1,218
1995	1,601
1996	826
1997	1,256
1998	1,011
1999	1,428
2000	912
2001	1,487
2002	2,084
2003	969
2004	846
2005	622
2006	1,262
2007	675
2008	913
2009	624
2010	478
2011	1,122
2012	744
2013	2,509
2014	534
2015	519
2016	973
2017	588
2018	1,202
2019	601
2020	770
2021	592
2022	1,013
2023	739
2024	641
2025	997
2026	498

Download the Data

Data for records on 1991-04-18: 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 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 200	628
200 to 400	3
400 to 600	1
600 to 800	0
800 to 1000	1