Demopolis Lock 4 Weather Records (USC00012240)

Record envelope, standing records and threshold days for Demopolis Lock 4 (USC00012240), Alabama, United States, with 63 years of record.

Key Facts for Demopolis Lock 4

Demopolis Lock 4 (USC00012240) is a weather station in Alabama, United States at 32.52 latitude and -87.85 longitude, 31 m (102 ft) above sea level.
The station reports from 1892 to 1954, 63 years of record.
1,460 records set at Demopolis Lock 4 still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Demopolis Lock 4 set a daily record precipitation of 31.8 mm (1.3 in) on 12 December 1953.

About the Station

Location: Alabama, United States, 32.52 latitude, -87.85 longitude.
Elevation: 31 m (102 ft).
Period of record: 1892 to 1954, 63 years.
Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Demopolis Lock 4. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Demopolis Lock 4, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	27.2 C (81.0 F)	-6.1 C (21.0 F)	n/a	n/a
Feb	31.1 C (88.0 F)	-6.1 C (21.0 F)	n/a	n/a
Mar	30.0 C (86.0 F)	-3.9 C (25.0 F)	n/a	n/a
Apr	31.7 C (89.1 F)	0.6 C (33.1 F)	n/a	n/a
May	35.0 C (95.0 F)	5.6 C (42.1 F)	n/a	n/a
Jun	39.4 C (102.9 F)	10.6 C (51.1 F)	n/a	n/a
Jul	40.0 C (104.0 F)	16.7 C (62.1 F)	n/a	n/a
Aug	41.1 C (106.0 F)	14.4 C (57.9 F)	n/a	n/a
Sep	38.3 C (100.9 F)	8.3 C (46.9 F)	n/a	n/a
Oct	33.9 C (93.0 F)	-3.3 C (26.1 F)	n/a	n/a
Nov	31.7 C (89.1 F)	-5.0 C (23.0 F)	n/a	n/a
Dec	28.3 C (82.9 F)	-8.3 C (17.1 F)	n/a	n/a

Which Years Hold Standing Records

1,460 standing records

1,460 records at Demopolis Lock 4 still stand. 1951 holds the most, with 403.

Wettest Day of Each Month

Apr: 228.6 mm (9.0 in)

The wettest day on record for each calendar month at Demopolis Lock 4. The most was 228.6 mm (9.0 in) on 17 April 1900.

Record daily precipitation for each month at Demopolis Lock 4
Month	Record daily precipitation (mm)	Date
Jan	107.7 mm (4.2 in)	12 January 1905
Feb	104.6 mm (4.1 in)	4 February 1936
Mar	165.1 mm (6.5 in)	19 March 1906
Apr	228.6 mm (9.0 in)	17 April 1900
May	112.3 mm (4.4 in)	6 May 1908
Jun	99.1 mm (3.9 in)	6 June 1918
Jul	137.9 mm (5.4 in)	25 July 1933
Aug	152.4 mm (6.0 in)	16 August 1901
Sep	120.9 mm (4.8 in)	11 September 1907
Oct	150.4 mm (5.9 in)	16 October 1932
Nov	111.8 mm (4.4 in)	13 November 1929
Dec	159.5 mm (6.3 in)	9 December 1919

Period of Record Coverage

1897 to 1954

5 years of record at Demopolis Lock 4, 1897 to 1954. 3 years have data for under 90 percent of days and are left out of rankings: 1897, 1951, 1954.

Latest Records

Latest records at Demopolis Lock 4
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 December 1953	Demopolis Lock 4, US	daily rain	31.8 mm (1.3 in)	6.9 mm (0.27 in)	58 years	26 of 100 (Routine)
4 December 1953	Demopolis Lock 4, US	daily rain	59.2 mm (2.3 in)	9.4 mm (0.37 in)	40 years	23 of 100 (Routine)
20 November 1953	Demopolis Lock 4, US	daily rain	28.2 mm (1.1 in)	9.4 mm (0.37 in)	12 years	15 of 100 (Routine)
20 September 1953	Demopolis Lock 4, US	daily rain	47.0 mm (1.9 in)	22.4 mm (0.9 in)	20 years	25 of 100 (Routine)
21 July 1953	Demopolis Lock 4, US	daily rain	56.6 mm (2.2 in)	17.5 mm (0.7 in)	55 years	33 of 100 (Routine)
19 November 1952	Demopolis Lock 4, US	daily rain	50.8 mm (2.0 in)	6.9 mm (0.27 in)	4 years	11 of 100 (Routine)
15 September 1952	Demopolis Lock 4, US	daily rain	61.0 mm (2.4 in)	11.2 mm (0.4 in)	40 years	24 of 100 (Routine)
24 August 1952	Demopolis Lock 4, US	daily rain	19.3 mm (0.8 in)	3.0 mm (0.12 in)	20 years	13 of 100 (Routine)
19 May 1952	Demopolis Lock 4, US	daily rain	63.0 mm (2.5 in)	19.8 mm (0.8 in)	44 years	30 of 100 (Routine)
13 April 1952	Demopolis Lock 4, US	daily rain	44.7 mm (1.8 in)	12.2 mm (0.5 in)	43 years	23 of 100 (Routine)
11 March 1952	Demopolis Lock 4, US	daily rain	36.1 mm (1.4 in)	9.2 mm (0.36 in)	55 years	26 of 100 (Routine)
23 January 1952	Demopolis Lock 4, US	daily rain	23.6 mm (0.9 in)	1.5 mm (0.06 in)	36 years	17 of 100 (Routine)
21 December 1951	Demopolis Lock 4, US	daily rain	32.3 mm (1.3 in)	22.1 mm (0.9 in)	53 years	34 of 100 (Routine)
15 December 1951	Demopolis Lock 4, US	daily rain	26.9 mm (1.1 in)	2.8 mm (0.11 in)	25 years	14 of 100 (Routine)
18 June 1951	Demopolis Lock 4, US	daily rain	43.7 mm (1.7 in)	9.4 mm (0.37 in)	5 years	13 of 100 (Routine)
17 June 1951	Demopolis Lock 4, US	daily rain	38.1 mm (1.5 in)	1.3 mm (0.05 in)	10 years	9 of 100 (Routine)
29 March 1951	Demopolis Lock 4, US	daily rain	149.4 mm (5.9 in)	84.6 mm (3.3 in)	38 years	56 of 100 (Notable)
7 February 1951	Demopolis Lock 4, US	daily rain	33.5 mm (1.3 in)	15.7 mm (0.6 in)	48 years	29 of 100 (Routine)
21 October 1950	Demopolis Lock 4, US	daily rain	32.8 mm (1.3 in)	6.1 mm (0.24 in)	51 years	23 of 100 (Routine)
29 August 1950	Demopolis Lock 4, US	daily rain	58.9 mm (2.3 in)	17.2 mm (0.7 in)	48 years	30 of 100 (Routine)

Extremes by Year

1892 to 1954

Yearly extremes at Demopolis Lock 4: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.1 C (106.0 F)	1954	38.9 C (102.0 F)	5
Coldest night (TNn)	-8.3 C (17.1 F)	1951	-7.2 C (19.0 F)	5
Wettest day (Rx1day)	228.6 mm (9.0 in)	1900	83.1 mm (3.3 in)	63
Wettest five days (Rx5day)	294.6 mm (11.6 in)	1919	126.3 mm (5.0 in)	63
Longest dry spell (CDD)	50 days	1924	22 days	63

Hottest day (TXx)

The hottest day of the year at Demopolis Lock 4, 1892 to 1954. The record is 41.1 C (106.0 F) in 1954, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at Demopolis Lock 4 by year
Year	Hottest day (TXx)
1892	n/a
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	37.8 C (100.0 F)
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	38.9 C (102.0 F)
1952	40.0 C (104.0 F)
1953	37.8 C (100.0 F)
1954	41.1 C (106.0 F)

Coldest night (TNn)

The coldest night of the year at Demopolis Lock 4, 1892 to 1954. The record is -8.3 C (17.1 F) in 1951, marked on the chart; the median year is -7.2 C (19.0 F).

Coldest night (TNn) at Demopolis Lock 4 by year
Year	Coldest night (TNn)
1892	n/a
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	4.4 C (39.9 F)
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	-8.3 C (17.1 F)
1952	-7.2 C (19.0 F)
1953	-8.3 C (17.1 F)
1954	-6.1 C (21.0 F)

Wettest day (Rx1day)

The wettest day of the year at Demopolis Lock 4, 1892 to 1954. The record is 228.6 mm (9.0 in) in 1900, marked on the chart; the median year is 83.1 mm (3.3 in).

Wettest day (Rx1day) at Demopolis Lock 4 by year
Year	Wettest day (Rx1day)
1892	49.5 mm (1.9 in)
1893	74.9 mm (2.9 in)
1894	59.7 mm (2.4 in)
1895	83.1 mm (3.3 in)
1896	75.9 mm (3.0 in)
1897	101.6 mm (4.0 in)
1898	63.0 mm (2.5 in)
1899	61.0 mm (2.4 in)
1900	228.6 mm (9.0 in)
1901	152.4 mm (6.0 in)
1902	74.9 mm (2.9 in)
1903	51.8 mm (2.0 in)
1904	53.3 mm (2.1 in)
1905	107.7 mm (4.2 in)
1906	165.1 mm (6.5 in)
1907	120.9 mm (4.8 in)
1908	112.3 mm (4.4 in)
1909	99.6 mm (3.9 in)
1910	61.0 mm (2.4 in)
1911	96.5 mm (3.8 in)
1912	79.2 mm (3.1 in)
1913	63.5 mm (2.5 in)
1914	66.0 mm (2.6 in)
1915	91.4 mm (3.6 in)
1916	112.3 mm (4.4 in)
1917	77.5 mm (3.1 in)
1918	133.4 mm (5.3 in)
1919	159.5 mm (6.3 in)
1920	83.8 mm (3.3 in)
1921	66.0 mm (2.6 in)
1922	77.0 mm (3.0 in)
1923	92.7 mm (3.6 in)
1924	58.2 mm (2.3 in)
1925	81.3 mm (3.2 in)
1926	93.5 mm (3.7 in)
1927	102.9 mm (4.1 in)
1928	103.1 mm (4.1 in)
1929	144.8 mm (5.7 in)
1930	62.2 mm (2.4 in)
1931	51.3 mm (2.0 in)
1932	150.4 mm (5.9 in)
1933	137.9 mm (5.4 in)
1934	74.7 mm (2.9 in)
1935	63.0 mm (2.5 in)
1936	104.6 mm (4.1 in)
1937	85.6 mm (3.4 in)
1938	112.3 mm (4.4 in)
1939	81.0 mm (3.2 in)
1940	62.2 mm (2.4 in)
1941	96.5 mm (3.8 in)
1942	156.2 mm (6.1 in)
1943	61.0 mm (2.4 in)
1944	76.7 mm (3.0 in)
1945	105.2 mm (4.1 in)
1946	55.1 mm (2.2 in)
1947	97.8 mm (3.9 in)
1948	93.0 mm (3.7 in)
1949	92.2 mm (3.6 in)
1950	58.9 mm (2.3 in)
1951	149.4 mm (5.9 in)
1952	63.0 mm (2.5 in)
1953	59.9 mm (2.4 in)
1954	31.5 mm (1.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Demopolis Lock 4, 1892 to 1954. The record is 294.6 mm (11.6 in) in 1919, marked on the chart; the median year is 126.3 mm (5.0 in).

Wettest five days (Rx5day) at Demopolis Lock 4 by year
Year	Wettest five days (Rx5day)
1892	62.7 mm (2.5 in)
1893	144.8 mm (5.7 in)
1894	82.6 mm (3.3 in)
1895	99.6 mm (3.9 in)
1896	112.7 mm (4.4 in)
1897	112.5 mm (4.4 in)
1898	85.6 mm (3.4 in)
1899	104.9 mm (4.1 in)
1900	264.2 mm (10.4 in)
1901	176.3 mm (6.9 in)
1902	127.3 mm (5.0 in)
1903	120.4 mm (4.7 in)
1904	64.0 mm (2.5 in)
1905	125.9 mm (5.0 in)
1906	170.7 mm (6.7 in)
1907	188.5 mm (7.4 in)
1908	118.9 mm (4.7 in)
1909	186.9 mm (7.4 in)
1910	86.9 mm (3.4 in)
1911	135.1 mm (5.3 in)
1912	188.4 mm (7.4 in)
1913	126.3 mm (5.0 in)
1914	88.6 mm (3.5 in)
1915	108.7 mm (4.3 in)
1916	208.4 mm (8.2 in)
1917	140.8 mm (5.5 in)
1918	195.7 mm (7.7 in)
1919	294.6 mm (11.6 in)
1920	143.5 mm (5.6 in)
1921	124.5 mm (4.9 in)
1922	92.2 mm (3.6 in)
1923	102.4 mm (4.0 in)
1924	81.3 mm (3.2 in)
1925	162.6 mm (6.4 in)
1926	120.2 mm (4.7 in)
1927	155.3 mm (6.1 in)
1928	155.7 mm (6.1 in)
1929	248.7 mm (9.8 in)
1930	106.2 mm (4.2 in)
1931	67.1 mm (2.6 in)
1932	188.0 mm (7.4 in)
1933	175.2 mm (6.9 in)
1934	119.9 mm (4.7 in)
1935	102.8 mm (4.0 in)
1936	175.7 mm (6.9 in)
1937	149.0 mm (5.9 in)
1938	179.2 mm (7.1 in)
1939	141.0 mm (5.6 in)
1940	118.2 mm (4.7 in)
1941	154.5 mm (6.1 in)
1942	164.5 mm (6.5 in)
1943	157.2 mm (6.2 in)
1944	112.6 mm (4.4 in)
1945	167.9 mm (6.6 in)
1946	110.9 mm (4.4 in)
1947	163.8 mm (6.4 in)
1948	178.1 mm (7.0 in)
1949	111.8 mm (4.4 in)
1950	112.2 mm (4.4 in)
1951	202.0 mm (8.0 in)
1952	106.4 mm (4.2 in)
1953	119.1 mm (4.7 in)
1954	52.3 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Demopolis Lock 4, 1892 to 1954. The record is 50 days in 1924, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Demopolis Lock 4 by year
Year	Longest dry spell (CDD)
1892	11 days
1893	29 days
1894	45 days
1895	32 days
1896	22 days
1897	27 days
1898	20 days
1899	35 days
1900	18 days
1901	32 days
1902	19 days
1903	20 days
1904	17 days
1905	16 days
1906	26 days
1907	15 days
1908	17 days
1909	30 days
1910	21 days
1911	27 days
1912	20 days
1913	32 days
1914	25 days
1915	20 days
1916	24 days
1917	16 days
1918	27 days
1919	16 days
1920	31 days
1921	26 days
1922	19 days
1923	38 days
1924	50 days
1925	29 days
1926	14 days
1927	24 days
1928	15 days
1929	19 days
1930	35 days
1931	33 days
1932	15 days
1933	22 days
1934	19 days
1935	29 days
1936	18 days
1937	20 days
1938	35 days
1939	43 days
1940	37 days
1941	23 days
1942	26 days
1943	22 days
1944	39 days
1945	17 days
1946	17 days
1947	20 days
1948	21 days
1949	19 days
1950	18 days
1951	28 days
1952	31 days
1953	26 days
1954	16 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

57 years, 1895 to 1953

A day with at least 85.5 mm (3.4 in) of rain is expected about once in 2 years. A day with at least 222.4 mm (8.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Demopolis Lock 4: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	85.5 mm (3.4 in)
5 years	115.3 mm (4.5 in)
10 years	137.5 mm (5.4 in)
25 years	168.7 mm (6.6 in)
50 years	194.4 mm (7.7 in)
100 years	222.4 mm (8.8 in)	Longer than the 57 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 57 years of values from 1895 to 1953.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 228.6 mm (9.0 in) in 1900; 165.1 mm (6.5 in) in 1906; 156.2 mm (6.1 in) in 1942.

Download the Data

Data for Demopolis Lock 4 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Demopolis Lock 4 threshold days by year: CSV or JSON. Field meanings are on the data page.

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)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

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

Year	Days with data	Share of year	Complete
1897	152	42%	No
1951	299	82%	No
1952	337	92%	Yes
1953	333	91%	Yes
1954	161	44%	No