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Data as of 2025-12-31
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Built 2026-10-16 (16 October 2026)

Monroe Lock 4 Weather Records (USC00166305)

Record envelope, standing records and threshold days for Monroe Lock 4 (USC00166305), Louisiana, United States, with 33 years of record.

Key Facts for Monroe Lock 4

  • Monroe Lock 4 (USC00166305) is a weather station in Louisiana, United States at 32.47 latitude and -92.12 longitude, 24 m (79 ft) above sea level.
  • The station reports from 1940 to 1972, 33 years of record.
  • 0 records set at Monroe Lock 4 still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Monroe Lock 4 set a daily record precipitation of 28.2 mm (1.1 in) on 16 March 1972.

About the Station

  • Location: Louisiana, United States, 32.47 latitude, -92.12 longitude.
  • Elevation: 24 m (79 ft).
  • Period of record: 1940 to 1972, 33 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Monroe Lock 4, with 2026 drawn through them The band shows the record high and record low for each calendar day at Monroe 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. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Monroe 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 Monroe Lock 4, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
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Which Years Hold Standing Records

0 standing records
Standing records at Monroe Lock 4 by the year they were set 0 records at Monroe Lock 4 still stand. 00000000000
0 records at Monroe Lock 4 still stand.
Standing records at Monroe Lock 4 by the year they were set
Year setStanding records

Wettest Day of Each Month

Feb: 178.8 mm (7.0 in)
Record daily precipitation for each month at Monroe Lock 4 The wettest day on record for each calendar month at Monroe Lock 4. The most was 178.8 mm (7.0 in) on 10 February 1966. 050100150200 Jan: 161.3 mm (6.4 in), 3 January 1951 Jan Feb: 178.8 mm (7.0 in), 10 February 1966 Feb Mar: 127.0 mm (5.0 in), 30 March 1965 Mar Apr: 105.4 mm (4.1 in), 9 April 1942 Apr May: 88.1 mm (3.5 in), 7 May 1971 May Jun: 111.3 mm (4.4 in), 21 June 1950 Jun Jul: 82.6 mm (3.3 in), 24 July 1963 Jul Aug: 80.8 mm (3.2 in), 19 August 1942 Aug Sep: 113.0 mm (4.4 in), 11 September 1965 Sep Oct: 143.0 mm (5.6 in), 31 October 1941 Oct Nov: 109.7 mm (4.3 in), 28 November 1968 Nov Dec: 118.1 mm (4.6 in), 16 December 1948 Dec
The wettest day on record for each calendar month at Monroe Lock 4. The most was 178.8 mm (7.0 in) on 10 February 1966.
Record daily precipitation for each month at Monroe Lock 4
MonthRecord daily precipitation (mm)Date
Jan161.3 mm (6.4 in)3 January 1951
Feb178.8 mm (7.0 in)10 February 1966
Mar127.0 mm (5.0 in)30 March 1965
Apr105.4 mm (4.1 in)9 April 1942
May88.1 mm (3.5 in)7 May 1971
Jun111.3 mm (4.4 in)21 June 1950
Jul82.6 mm (3.3 in)24 July 1963
Aug80.8 mm (3.2 in)19 August 1942
Sep113.0 mm (4.4 in)11 September 1965
Oct143.0 mm (5.6 in)31 October 1941
Nov109.7 mm (4.3 in)28 November 1968
Dec118.1 mm (4.6 in)16 December 1948

Latest Records

18
Latest records at Monroe Lock 4
DateStationRecordValueBeat old record byOld record stoodSignificance
16 March 1972Monroe Lock 4, USdaily rain28.2 mm (1.1 in)1.0 mm (0.04 in)3 years3 of 100 (Routine)
7 February 1972Monroe Lock 4, USdaily rain41.4 mm (1.6 in)25.1 mm (1.0 in)20 years22 of 100 (Routine)
4 January 1972Monroe Lock 4, USdaily rain77.5 mm (3.1 in)50.8 mm (2.0 in)4 years34 of 100 (Routine)
2 January 1972Monroe Lock 4, USdaily rain50.8 mm (2.0 in)5.6 mm (0.22 in)28 years14 of 100 (Routine)
17 December 1971Monroe Lock 4, USdaily rain71.6 mm (2.8 in)31.0 mm (1.2 in)12 years24 of 100 (Routine)
19 November 1971Monroe Lock 4, USdaily rain71.4 mm (2.8 in)2.1 mm (0.08 in)22 years10 of 100 (Routine)
2 September 1971Monroe Lock 4, USdaily rain25.9 mm (1.0 in)6.6 mm (0.26 in)29 years14 of 100 (Routine)
21 August 1971Monroe Lock 4, USdaily rain48.8 mm (1.9 in)34.3 mm (1.4 in)8 years31 of 100 (Routine)
9 August 1971Monroe Lock 4, USdaily rain16.5 mm (0.6 in)4.6 mm (0.18 in)20 years12 of 100 (Routine)
29 July 1971Monroe Lock 4, USdaily rain58.9 mm (2.3 in)42.9 mm (1.7 in)25 years37 of 100 (Notable)
30 June 1971Monroe Lock 4, USdaily rain31.2 mm (1.2 in)6.8 mm (0.27 in)28 years15 of 100 (Routine)
2 June 1971Monroe Lock 4, USdaily rain76.7 mm (3.0 in)60.2 mm (2.4 in)1 year39 of 100 (Notable)
11 May 1971Monroe Lock 4, USdaily rain73.7 mm (2.9 in)43.2 mm (1.7 in)16 years31 of 100 (Routine)
10 May 1971Monroe Lock 4, USdaily rain17.3 mm (0.7 in)0.3 mm (0.01 in)16 years8 of 100 (Routine)
7 May 1971Monroe Lock 4, USmonthly rain88.1 mm (3.5 in)2.5 mm (0.10 in)23 years21 of 100 (Routine)
22 April 1971Monroe Lock 4, USdaily rain49.0 mm (1.9 in)34.8 mm (1.4 in)20 years26 of 100 (Routine)
26 February 1971Monroe Lock 4, USdaily rain32.3 mm (1.3 in)23.4 mm (0.9 in)21 years21 of 100 (Routine)
22 February 1971Monroe Lock 4, USdaily rain52.6 mm (2.1 in)10.7 mm (0.4 in)20 years14 of 100 (Routine)

Extremes by Year

1940 to 1972
Yearly extremes at Monroe Lock 4: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)178.8 mm (7.0 in)196682.6 mm (3.3 in)33
Wettest five days (Rx5day)257.3 mm (10.1 in)1947142.0 mm (5.6 in)33
Longest dry spell (CDD)52 days195220 days33

Wettest day (Rx1day)

Wettest day (Rx1day) at Monroe Lock 4 by year The wettest day of the year at Monroe Lock 4, 1940 to 1972. The record is 178.8 mm (7.0 in) in 1966, marked on the chart; the median year is 82.6 mm (3.3 in). 501001502001940195019601970Record: 178.8 mm (7.0 in) in 1966
The wettest day of the year at Monroe Lock 4, 1940 to 1972. The record is 178.8 mm (7.0 in) in 1966, marked on the chart; the median year is 82.6 mm (3.3 in).
Wettest day (Rx1day) at Monroe Lock 4 by year
YearWettest day (Rx1day)
194065.5 mm (2.6 in)
1941143.0 mm (5.6 in)
1942105.4 mm (4.1 in)
194369.9 mm (2.8 in)
194465.5 mm (2.6 in)
194575.7 mm (3.0 in)
194653.3 mm (2.1 in)
1947104.1 mm (4.1 in)
1948118.1 mm (4.6 in)
194988.9 mm (3.5 in)
1950111.3 mm (4.4 in)
1951161.3 mm (6.4 in)
195262.2 mm (2.4 in)
195369.9 mm (2.8 in)
195478.2 mm (3.1 in)
1955123.2 mm (4.9 in)
195678.7 mm (3.1 in)
195792.5 mm (3.6 in)
1958105.4 mm (4.1 in)
195967.3 mm (2.6 in)
196052.1 mm (2.1 in)
196196.0 mm (3.8 in)
196278.7 mm (3.1 in)
196382.6 mm (3.3 in)
196482.6 mm (3.3 in)
1965127.0 mm (5.0 in)
1966178.8 mm (7.0 in)
196764.3 mm (2.5 in)
1968109.7 mm (4.3 in)
196965.5 mm (2.6 in)
197094.5 mm (3.7 in)
197188.1 mm (3.5 in)
197277.5 mm (3.1 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Monroe Lock 4 by year The wettest five days of the year at Monroe Lock 4, 1940 to 1972. The record is 257.3 mm (10.1 in) in 1947, marked on the chart; the median year is 142.0 mm (5.6 in). 501001502002503001940195019601970Record: 257.3 mm (10.1 in) in 1947
The wettest five days of the year at Monroe Lock 4, 1940 to 1972. The record is 257.3 mm (10.1 in) in 1947, marked on the chart; the median year is 142.0 mm (5.6 in).
Wettest five days (Rx5day) at Monroe Lock 4 by year
YearWettest five days (Rx5day)
194080.4 mm (3.2 in)
1941194.6 mm (7.7 in)
1942186.4 mm (7.3 in)
194371.2 mm (2.8 in)
1944153.2 mm (6.0 in)
1945142.0 mm (5.6 in)
1946131.7 mm (5.2 in)
1947257.3 mm (10.1 in)
1948136.1 mm (5.4 in)
1949118.9 mm (4.7 in)
1950165.5 mm (6.5 in)
1951198.9 mm (7.8 in)
195286.3 mm (3.4 in)
1953141.7 mm (5.6 in)
1954125.7 mm (4.9 in)
1955175.5 mm (6.9 in)
1956183.6 mm (7.2 in)
1957117.4 mm (4.6 in)
1958166.1 mm (6.5 in)
195983.5 mm (3.3 in)
196083.9 mm (3.3 in)
1961149.2 mm (5.9 in)
1962106.5 mm (4.2 in)
1963139.8 mm (5.5 in)
1964161.2 mm (6.3 in)
1965154.7 mm (6.1 in)
1966215.7 mm (8.5 in)
1967106.2 mm (4.2 in)
1968167.9 mm (6.6 in)
196973.9 mm (2.9 in)
1970164.6 mm (6.5 in)
1971179.1 mm (7.1 in)
1972139.8 mm (5.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Monroe Lock 4 by year The longest dry spell of the year at Monroe Lock 4, 1940 to 1972. The record is 52 days in 1952, marked on the chart; the median year is 20 days. 02040601940195019601970Record: 52 days in 1952
The longest dry spell of the year at Monroe Lock 4, 1940 to 1972. The record is 52 days in 1952, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Monroe Lock 4 by year
YearLongest dry spell (CDD)
19406 days
194120 days
194219 days
194322 days
194414 days
194518 days
194613 days
194735 days
194819 days
194927 days
195016 days
195124 days
195252 days
195336 days
195422 days
195522 days
195621 days
195715 days
195822 days
195919 days
196014 days
196122 days
196227 days
196329 days
196419 days
196529 days
196616 days
196719 days
196817 days
196922 days
197021 days
197119 days
197211 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

30 years, 1941 to 1971

A day with at least 88.0 mm (3.5 in) of rain is expected about once in 2 years. A day with at least 205.0 mm (8.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Monroe Lock 4: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years88.0 mm (3.5 in)
5 years114.8 mm (4.5 in)
10 years134.2 mm (5.3 in)
25 years160.8 mm (6.3 in)
50 years182.3 mm (7.2 in)Longer than the 30 years of record
100 years205.0 mm (8.1 in)Longer than the 30 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, 30 years of values from 1941 to 1971.

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: 178.8 mm (7.0 in) in 1966; 161.3 mm (6.4 in) in 1951; 143.0 mm (5.6 in) in 1941.

Download the Data

  • Data for Monroe Lock 4 standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Monroe 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 . Last revised (2025-12-31).