Pearl River Lock 1 Weather Records (USC00167161)

Record envelope, standing records and threshold days for Pearl River Lock 1 (USC00167161), Louisiana, United States, with 38 years of record.

Key Facts for Pearl River Lock 1

Pearl River Lock 1 (USC00167161) is a weather station in Louisiana, United States at 30.45 latitude and -89.78 longitude, 9 m (30 ft) above sea level.
The station reports from 1948 to 1985, 38 years of record.
116 records set at Pearl River Lock 1 still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Pearl River Lock 1 set a daily record precipitation of 77.5 mm (3.1 in) on 21 March 1985.

About the Station

Location: Louisiana, United States, 30.45 latitude, -89.78 longitude.
Elevation: 9 m (30 ft).
Period of record: 1948 to 1985, 38 years.
Eligible elements: prcp, snow, snwd.

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 Pearl River Lock 1. 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 Pearl River Lock 1, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	32.8 C (91.0 F)	10.0 C (50.0 F)	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

116 standing records

116 records at Pearl River Lock 1 still stand. 1967 holds the most, with 116.

Wettest Day of Each Month

May: 231.9 mm (9.1 in)

The wettest day on record for each calendar month at Pearl River Lock 1. The most was 231.9 mm (9.1 in) on 12 May 1972.

Record daily precipitation for each month at Pearl River Lock 1
Month	Record daily precipitation (mm)	Date
Jan	96.5 mm (3.8 in)	25 January 1978
Feb	129.5 mm (5.1 in)	10 February 1981
Mar	162.8 mm (6.4 in)	18 March 1980
Apr	162.6 mm (6.4 in)	22 April 1951
May	231.9 mm (9.1 in)	12 May 1972
Jun	75.4 mm (3.0 in)	20 June 1961
Jul	78.2 mm (3.1 in)	8 July 1956
Aug	154.9 mm (6.1 in)	18 August 1969
Sep	145.8 mm (5.7 in)	17 September 1954
Oct	81.5 mm (3.2 in)	30 October 1976
Nov	125.7 mm (4.9 in)	20 November 1953
Dec	167.6 mm (6.6 in)	26 December 1973

Period of Record Coverage

1967 to 1967

1 years of record at Pearl River Lock 1, 1967 to 1967. 1 years have data for under 90 percent of days and are left out of rankings: 1967.

Latest Records

Latest records at Pearl River Lock 1
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 March 1985	Pearl River Lock 1, US	daily rain	77.5 mm (3.1 in)	50.8 mm (2.0 in)	15 years	29 of 100 (Routine)
1 March 1985	Pearl River Lock 1, US	daily rain	25.9 mm (1.0 in)	1.5 mm (0.06 in)	12 years	6 of 100 (Routine)
28 January 1985	Pearl River Lock 1, US	daily rain	52.1 mm (2.1 in)	0.8 mm (0.03 in)	37 years	14 of 100 (Routine)
17 January 1985	Pearl River Lock 1, US	daily rain	63.5 mm (2.5 in)	36.8 mm (1.4 in)	21 years	32 of 100 (Routine)
5 December 1984	Pearl River Lock 1, US	daily rain	52.1 mm (2.1 in)	29.0 mm (1.1 in)	2 years	16 of 100 (Routine)
15 October 1984	Pearl River Lock 1, US	daily rain	31.2 mm (1.2 in)	25.9 mm (1.0 in)	25 years	26 of 100 (Routine)
23 September 1984	Pearl River Lock 1, US	daily rain	19.1 mm (0.8 in)	6.4 mm (0.25 in)	28 years	13 of 100 (Routine)
22 September 1984	Pearl River Lock 1, US	daily rain	18.3 mm (0.7 in)	9.2 mm (0.36 in)	21 years	13 of 100 (Routine)
13 August 1984	Pearl River Lock 1, US	daily rain	34.0 mm (1.3 in)	4.3 mm (0.17 in)	16 years	9 of 100 (Routine)
8 August 1984	Pearl River Lock 1, US	daily rain	20.3 mm (0.8 in)	0.5 mm (0.02 in)	25 years	10 of 100 (Routine)
14 July 1984	Pearl River Lock 1, US	daily rain	49.3 mm (1.9 in)	10.7 mm (0.4 in)	16 years	14 of 100 (Routine)
21 May 1984	Pearl River Lock 1, US	daily rain	13.2 mm (0.5 in)	4.3 mm (0.17 in)	1 year	4 of 100 (Routine)
10 January 1984	Pearl River Lock 1, US	daily rain	24.4 mm (1.0 in)	5.6 mm (0.22 in)	18 years	11 of 100 (Routine)
28 December 1983	Pearl River Lock 1, US	daily rain	76.7 mm (3.0 in)	21.3 mm (0.8 in)	28 years	21 of 100 (Routine)
27 December 1983	Pearl River Lock 1, US	daily rain	28.4 mm (1.1 in)	12.1 mm (0.5 in)	21 years	14 of 100 (Routine)
24 November 1983	Pearl River Lock 1, US	daily rain	26.9 mm (1.1 in)	14.7 mm (0.6 in)	4 years	11 of 100 (Routine)
12 September 1983	Pearl River Lock 1, US	daily rain	45.5 mm (1.8 in)	10.2 mm (0.4 in)	21 years	13 of 100 (Routine)
6 August 1983	Pearl River Lock 1, US	daily rain	31.8 mm (1.3 in)	13.3 mm (0.5 in)	22 years	17 of 100 (Routine)
6 July 1983	Pearl River Lock 1, US	daily rain	53.3 mm (2.1 in)	16.2 mm (0.6 in)	26 years	21 of 100 (Routine)
6 June 1983	Pearl River Lock 1, US	daily rain	24.1 mm (0.9 in)	7.8 mm (0.31 in)	24 years	15 of 100 (Routine)

Extremes by Year

1948 to 1985

Yearly extremes at Pearl River Lock 1: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	32.8 C (91.0 F)	1967	32.8 C (91.0 F)	1
Coldest night (TNn)	10.0 C (50.0 F)	1967	10.0 C (50.0 F)	1
Wettest day (Rx1day)	231.9 mm (9.1 in)	1972	102.9 mm (4.0 in)	38
Wettest five days (Rx5day)	297.3 mm (11.7 in)	1980	161.6 mm (6.4 in)	38
Longest dry spell (CDD)	50 days	1965	22 days	38

Hottest day (TXx)

The hottest day of the year at Pearl River Lock 1, 1948 to 1985. The record is 32.8 C (91.0 F) in 1967, marked on the chart; the median year is 32.8 C (91.0 F).

Hottest day (TXx) at Pearl River Lock 1 by year
Year	Hottest day (TXx)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	32.8 C (91.0 F)
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a

Coldest night (TNn)

The coldest night of the year at Pearl River Lock 1, 1948 to 1985. The record is 10.0 C (50.0 F) in 1967, marked on the chart; the median year is 10.0 C (50.0 F).

Coldest night (TNn) at Pearl River Lock 1 by year
Year	Coldest night (TNn)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	10.0 C (50.0 F)
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a

Wettest day (Rx1day)

The wettest day of the year at Pearl River Lock 1, 1948 to 1985. The record is 231.9 mm (9.1 in) in 1972, marked on the chart; the median year is 102.9 mm (4.0 in).

Wettest day (Rx1day) at Pearl River Lock 1 by year
Year	Wettest day (Rx1day)
1948	138.4 mm (5.4 in)
1949	45.2 mm (1.8 in)
1950	55.9 mm (2.2 in)
1951	162.6 mm (6.4 in)
1952	72.1 mm (2.8 in)
1953	137.2 mm (5.4 in)
1954	145.8 mm (5.7 in)
1955	123.2 mm (4.9 in)
1956	101.6 mm (4.0 in)
1957	143.8 mm (5.7 in)
1958	207.0 mm (8.1 in)
1959	78.7 mm (3.1 in)
1960	69.9 mm (2.8 in)
1961	134.6 mm (5.3 in)
1962	90.4 mm (3.6 in)
1963	71.1 mm (2.8 in)
1964	66.0 mm (2.6 in)
1965	86.4 mm (3.4 in)
1966	101.6 mm (4.0 in)
1967	115.1 mm (4.5 in)
1968	45.7 mm (1.8 in)
1969	154.9 mm (6.1 in)
1970	85.9 mm (3.4 in)
1971	50.3 mm (2.0 in)
1972	231.9 mm (9.1 in)
1973	167.6 mm (6.6 in)
1974	145.5 mm (5.7 in)
1975	60.5 mm (2.4 in)
1976	81.5 mm (3.2 in)
1977	124.5 mm (4.9 in)
1978	104.1 mm (4.1 in)
1979	101.6 mm (4.0 in)
1980	162.8 mm (6.4 in)
1981	129.5 mm (5.1 in)
1982	116.8 mm (4.6 in)
1983	118.9 mm (4.7 in)
1984	59.7 mm (2.4 in)
1985	77.5 mm (3.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Pearl River Lock 1, 1948 to 1985. The record is 297.3 mm (11.7 in) in 1980, marked on the chart; the median year is 161.6 mm (6.4 in).

Wettest five days (Rx5day) at Pearl River Lock 1 by year
Year	Wettest five days (Rx5day)
1948	263.4 mm (10.4 in)
1949	48.5 mm (1.9 in)
1950	85.9 mm (3.4 in)
1951	180.4 mm (7.1 in)
1952	133.1 mm (5.2 in)
1953	167.4 mm (6.6 in)
1954	179.6 mm (7.1 in)
1955	249.7 mm (9.8 in)
1956	193.6 mm (7.6 in)
1957	199.3 mm (7.8 in)
1958	264.9 mm (10.4 in)
1959	116.6 mm (4.6 in)
1960	117.4 mm (4.6 in)
1961	206.5 mm (8.1 in)
1962	100.6 mm (4.0 in)
1963	115.0 mm (4.5 in)
1964	134.6 mm (5.3 in)
1965	124.0 mm (4.9 in)
1966	172.3 mm (6.8 in)
1967	190.7 mm (7.5 in)
1968	79.8 mm (3.1 in)
1969	157.9 mm (6.2 in)
1970	120.3 mm (4.7 in)
1971	93.2 mm (3.7 in)
1972	277.9 mm (10.9 in)
1973	180.4 mm (7.1 in)
1974	200.1 mm (7.9 in)
1975	134.0 mm (5.3 in)
1976	92.7 mm (3.6 in)
1977	156.7 mm (6.2 in)
1978	187.1 mm (7.4 in)
1979	164.2 mm (6.5 in)
1980	297.3 mm (11.7 in)
1981	199.4 mm (7.9 in)
1982	159.0 mm (6.3 in)
1983	191.0 mm (7.5 in)
1984	93.0 mm (3.7 in)
1985	78.5 mm (3.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Pearl River Lock 1, 1948 to 1985. The record is 50 days in 1965, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Pearl River Lock 1 by year
Year	Longest dry spell (CDD)
1948	17 days
1949	12 days
1950	16 days
1951	26 days
1952	45 days
1953	27 days
1954	16 days
1955	26 days
1956	26 days
1957	21 days
1958	16 days
1959	16 days
1960	16 days
1961	25 days
1962	34 days
1963	22 days
1964	22 days
1965	50 days
1966	20 days
1967	28 days
1968	22 days
1969	19 days
1970	20 days
1971	24 days
1972	22 days
1973	13 days
1974	22 days
1975	14 days
1976	15 days
1977	15 days
1978	38 days
1979	25 days
1980	16 days
1981	23 days
1982	20 days
1983	19 days
1984	25 days
1985	13 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

33 years, 1948 to 1984

A day with at least 109.1 mm (4.3 in) of rain is expected about once in 2 years. A day with at least 233.6 mm (9.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Pearl River Lock 1: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	109.1 mm (4.3 in)
5 years	148.4 mm (5.8 in)
10 years	171.8 mm (6.8 in)
25 years	198.7 mm (7.8 in)
50 years	216.9 mm (8.5 in)	Longer than the 33 years of record
100 years	233.6 mm (9.2 in)	Longer than the 33 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, 33 years of values from 1948 to 1984.

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: 231.9 mm (9.1 in) in 1972; 207.0 mm (8.1 in) in 1958; 162.8 mm (6.4 in) in 1980.

Download the Data

Data for Pearl River Lock 1 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Pearl River Lock 1 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).