Weather Records on 31 July 1984

777 weather records were set or tied worldwide on 31 July 1984. Highest significance: Erica, AU.

Key Facts for 31 July 1984

On 31 July 1984, 777 weather records were set or tied at long-record stations worldwide.
242 were record highs and 297 were record lows, counting maximum and minimum temperature.
By timescale, 10 were all-time records, 19 monthly and 748 daily.
Erica set a monthly record daily precipitation of 112.6 mm (4.4 in) on 31 July 1984.
Across 155 earlier years (1804 to 2026) the same calendar date averaged 469 records.

Record Map

777 stations

777 station records on 31 July 1984 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 31 July 1984: highest significance records shown on the map
Station	Country	Type	Value	Significance
Erica	Australia	Record daily precipitation	112.6 mm (4.4 in)	63 of 100 (Major)
Navojoa	Mexico	Record daily precipitation	111.8 mm (4.4 in)	56 of 100 (Notable)
Oneonta	United States	Record daily precipitation	76.2 mm (3.0 in)	53 of 100 (Notable)
Villa de Chiapilla	Mexico	Record daily precipitation	78.0 mm (3.1 in)	51 of 100 (Notable)
Fayetteville Wtp	United States	Record daily precipitation	54.6 mm (2.1 in)	47 of 100 (Notable)
Alma Bacon Co AP	United States	Record daily precipitation	74.4 mm (2.9 in)	47 of 100 (Notable)
Whalen Dam (Usbr)	United States	Record daily precipitation	49.8 mm (2.0 in)	46 of 100 (Notable)
Atyrau	Kazakhstan	Record high minimum temperature	27.8 C (82.0 F)	45 of 100 (Notable)
Carrollton	United States	Record daily precipitation	71.4 mm (2.8 in)	45 of 100 (Notable)
Curryville 3 W	United States	Record daily precipitation	68.3 mm (2.7 in)	45 of 100 (Notable)
Waynesboro 2 S	United States	Record low maximum temperature	24.4 C (75.9 F)	45 of 100 (Notable)
Mbabane	Swaziland	Record daily precipitation	32.8 mm (1.3 in)	45 of 100 (Notable)
Americus	United States	Record daily precipitation	62.7 mm (2.5 in)	44 of 100 (Notable)
Norcross	United States	Record daily precipitation	58.9 mm (2.3 in)	43 of 100 (Notable)
Plauen	Germany	Record high minimum temperature	19.0 C (66.2 F)	42 of 100 (Notable)
Freehold-Marlboro	United States	Record low maximum temperature	21.7 C (71.1 F)	42 of 100 (Notable)
Robertsdale	United States	Record low minimum temperature	16.1 C (61.0 F)	41 of 100 (Notable)
Rome	United States	Record daily precipitation	57.2 mm (2.3 in)	41 of 100 (Notable)
Karlsruhe	Germany	Record high minimum temperature	19.2 C (66.6 F)	40 of 100 (Notable)
San Pedro	Mexico	Record daily precipitation	59.9 mm (2.4 in)	40 of 100 (Notable)
Guntersville	United States	Record daily precipitation	38.6 mm (1.5 in)	40 of 100 (Notable)
McGill	United States	Record low minimum temperature	3.3 C (37.9 F)	40 of 100 (Notable)
Keeline 3 W	United States	Record daily precipitation	36.6 mm (1.4 in)	40 of 100 (Notable)
Catus	France	Record daily precipitation	38.2 mm (1.5 in)	39 of 100 (Notable)
Metapa de Dominguez	Mexico	Record low minimum temperature	15.0 C (59.0 F)	39 of 100 (Notable)
Arnsberg	Germany	Record high minimum temperature	19.5 C (67.1 F)	38 of 100 (Notable)
Osnabruck	Germany	Record high minimum temperature	22.5 C (72.5 F)	38 of 100 (Notable)
Kr. Neckar-Odenwald Buchen	Germany	Record daily precipitation	37.1 mm (1.5 in)	38 of 100 (Notable)
Hammond	United States	Record low minimum temperature	17.8 C (64.0 F)	38 of 100 (Notable)
Chugwater	United States	Record daily precipitation	25.9 mm (1.0 in)	38 of 100 (Notable)
Bonn-Friesdorf	Germany	Record high minimum temperature	22.5 C (72.5 F)	37 of 100 (Notable)
Juchitan de Zaragoza	Mexico	Record low minimum temperature	16.7 C (62.1 F)	37 of 100 (Notable)
Bridgeport 5 NW	United States	Record daily precipitation	56.9 mm (2.2 in)	37 of 100 (Notable)
Rome	United States	Record low maximum temperature	20.6 C (69.1 F)	37 of 100 (Notable)
Hope	United States	Record low minimum temperature	9.4 C (48.9 F)	37 of 100 (Notable)
Lexington	United States	Record low maximum temperature	24.4 C (75.9 F)	37 of 100 (Notable)
Monteagle	United States	Record daily precipitation	50.3 mm (2.0 in)	37 of 100 (Notable)
Herford	Germany	Record high minimum temperature	21.0 C (69.8 F)	36 of 100 (Notable)
Oldenburg (A)	Germany	Record high minimum temperature	20.0 C (68.0 F)	36 of 100 (Notable)
Arecibo 3 ESE	Puerto Rico [United States]	Record low minimum temperature	17.2 C (63.0 F)	36 of 100 (Notable)
Gyzylarbat	Turkmenistan	Record high maximum temperature	44.9 C (112.8 F)	36 of 100 (Notable)
Ft Payne	United States	Record daily precipitation	77.0 mm (3.0 in)	36 of 100 (Notable)
Leeds	United States	Record daily precipitation	67.3 mm (2.6 in)	36 of 100 (Notable)
Valley Head	United States	Record low maximum temperature	20.0 C (68.0 F)	36 of 100 (Notable)
Fitzgerald	United States	Record low maximum temperature	23.9 C (75.0 F)	36 of 100 (Notable)
Chestnut Hill	United States	Record low maximum temperature	17.8 C (64.0 F)	36 of 100 (Notable)
Sanderson	United States	Record low minimum temperature	14.4 C (57.9 F)	36 of 100 (Notable)
Wheatland 4N	United States	Record daily precipitation	41.7 mm (1.6 in)	36 of 100 (Notable)
Sand Mt Substn	United States	Record daily precipitation	64.5 mm (2.5 in)	35 of 100 (Notable)
Alpine	United States	Record low minimum temperature	12.2 C (54.0 F)	35 of 100 (Notable)
Penjamo	Mexico	Record low maximum temperature	18.9 C (66.0 F)	34 of 100 (Routine)
Zimapan	Mexico	Record daily precipitation	25.9 mm (1.0 in)	34 of 100 (Routine)
Tierra Blanca (Smn)	Mexico	Record low maximum temperature	25.6 C (78.1 F)	34 of 100 (Routine)
Oneonta	United States	Record low maximum temperature	20.0 C (68.0 F)	34 of 100 (Routine)
Richmond	United States	Record low minimum temperature	7.8 C (46.0 F)	34 of 100 (Routine)
Adairsville	United States	Record daily precipitation	39.6 mm (1.6 in)	34 of 100 (Routine)
Dutch Harbor	United States	Record high maximum temperature	22.2 C (72.0 F)	34 of 100 (Routine)
Lanihau 68.2	United States	Record daily precipitation	60.5 mm (2.4 in)	34 of 100 (Routine)
Valley Head	United States	Record daily precipitation	62.7 mm (2.5 in)	33 of 100 (Routine)
Subiaco	United States	Record low minimum temperature	15.0 C (59.0 F)	33 of 100 (Routine)

Counts by Type and Timescale

777 records

Records set or tied on 31 July 1984 by type: Highest daily maximum 57, Lowest daily maximum 149, Highest daily minimum 185, Lowest daily minimum 148, Heaviest daily rainfall 238.

Records on 31 July 1984 by type
Record type	Records
Highest daily maximum	57
Lowest daily maximum	149
Highest daily minimum	185
Lowest daily minimum	148
Heaviest daily rainfall	238
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 31 July 1984 by timescale: all-time 10, monthly 19, daily 748.

How Much Records Were Beaten By

613 broken records

Margins by which the 613 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 57.2. Ties are not counted.

Top 20 by Significance

31 July 1984

Top 20 records on 31 July 1984 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 July 1984	Erica, AU	monthly rain	112.6 mm (4.4 in)	47.6 mm (1.9 in)	27 years	63 of 100 (Major)
31 July 1984	Navojoa, MX	monthly rain	111.8 mm (4.4 in)	31.5 mm (1.2 in)	43 years	56 of 100 (Notable)
31 July 1984	Oneonta, US	daily rain	76.2 mm (3.0 in)	31.7 mm (1.2 in)	81 years	53 of 100 (Notable)
31 July 1984	Villa de Chiapilla, MX	daily rain	78.0 mm (3.1 in)	57.2 mm (2.3 in)	36 years	51 of 100 (Notable)
31 July 1984	Fayetteville Wtp, US	daily rain	54.6 mm (2.1 in)	47.0 mm (1.9 in)	41 years	47 of 100 (Notable)
31 July 1984	Alma Bacon Co AP, US	daily rain	74.4 mm (2.9 in)	55.9 mm (2.2 in)	13 years	47 of 100 (Notable)
31 July 1984	Whalen Dam (Usbr), US	daily rain	49.8 mm (2.0 in)	40.7 mm (1.6 in)	12 years	46 of 100 (Notable)
31 July 1984	Atyrau, KZ	daily high min	27.8 C (82.0 F)	3.6 C (6.5 F)	82 years	45 of 100 (Notable)
31 July 1984	Carrollton, US	daily rain	71.4 mm (2.8 in)	20.6 mm (0.8 in)	78 years	45 of 100 (Notable)
31 July 1984	Curryville 3 W, US	daily rain	68.3 mm (2.7 in)	48.7 mm (1.9 in)	21 years	45 of 100 (Notable)
31 July 1984	Waynesboro 2 S, US	daily low max	24.4 C (75.9 F)	3.9 C (7.0 F)	75 years	45 of 100 (Notable)
31 July 1984	Mbabane, SZ	daily rain	32.8 mm (1.3 in)	21.1 mm (0.8 in)	48 years	45 of 100 (Notable)
31 July 1984	Americus, US	daily rain	62.7 mm (2.5 in)	11.9 mm (0.5 in)	89 years	44 of 100 (Notable)
31 July 1984	Norcross, US	daily rain	58.9 mm (2.3 in)	23.8 mm (0.9 in)	66 years	43 of 100 (Notable)
31 July 1984	Plauen, DE	daily high min	19.0 C (66.2 F)	0.9 C (1.6 F)	96 years	42 of 100 (Notable)
31 July 1984	Freehold-Marlboro, US	daily low max	21.7 C (71.1 F)	2.2 C (4.0 F)	88 years	42 of 100 (Notable)
31 July 1984	Robertsdale, US	daily low min	16.1 C (61.0 F)	3.3 C (5.9 F)	48 years	41 of 100 (Notable)
31 July 1984	Rome, US	daily rain	57.2 mm (2.3 in)	24.9 mm (1.0 in)	48 years	41 of 100 (Notable)
31 July 1984	Karlsruhe, DE	daily high min	19.2 C (66.6 F)	0.1 C (0.2 F)	104 years	40 of 100 (Notable)
31 July 1984	San Pedro, MX	daily rain	59.9 mm (2.4 in)	52.0 mm (2.0 in)	20 years	40 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

1804 to 1984

Records set or tied on this calendar date in each year from 1804 to 1984. 1984 had 777 records.

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

Records on 07-31 in each year
Year	Records
1804	1
1815	1
1816	1
1828	1
1834	1
1839	1
1840	1
1841	2
1851	1
1858	2
1860	4
1863	1
1866	1
1873	2
1876	1
1879	1
1884	1
1885	1
1886	1
1887	5
1889	2
1890	2
1891	1
1892	1
1893	3
1894	2
1896	2
1897	2
1898	5
1900	1
1901	3
1902	4
1903	16
1904	12
1905	10
1906	14
1907	17
1908	22
1909	15
1910	21
1911	29
1912	14
1913	31
1914	28
1915	71
1916	63
1917	126
1918	39
1919	27
1920	168
1921	112
1922	24
1923	236
1924	97
1925	349
1926	226
1927	161
1928	145
1929	134
1930	143
1931	441
1932	314
1933	504
1934	449
1935	418
1936	548
1937	297
1938	417
1939	357
1940	415
1941	323
1942	342
1943	342
1944	312
1945	499
1946	426
1947	341
1948	341
1949	406
1950	511
1951	364
1952	472
1953	414
1954	459
1955	813
1956	574
1957	268
1958	374
1959	424
1960	622
1961	504
1962	348
1963	294
1964	637
1965	858
1966	606
1967	326
1968	637
1969	440
1970	576
1971	1,850
1972	667
1973	583
1974	363
1975	1,386
1976	530
1977	543
1978	754
1979	501
1980	1,047
1981	672
1982	767
1983	901
1984	777
1985	1,065
1986	1,021
1987	934
1988	940
1989	1,753
1990	911
1991	647
1992	1,169
1993	1,031
1994	1,207
1995	1,223
1996	1,084
1997	984
1998	1,195
1999	1,643
2000	1,001
2001	1,414
2002	1,080
2003	1,157
2004	779
2005	742
2006	1,405
2007	1,023
2008	911
2009	1,156
2010	1,485
2011	1,040
2012	712
2013	469
2014	1,000
2015	948
2016	501
2017	485
2018	1,135
2019	551
2020	1,034
2021	1,020
2022	861
2023	671
2024	748
2025	836
2026	754

Download the Data

Data for records on 1984-07-31: 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).

Histogram of margins by which records were beaten on 31 July 1984
Margin	Records
0 to 10	540
10 to 20	42
20 to 30	13
30 to 40	10
40 to 50	5
50 to 60	3