Port Sulphur Weather Records (USC00167471)

Record envelope, standing records and threshold days for Port Sulphur (USC00167471), Louisiana, United States, with 30 years of record.

Key Facts for Port Sulphur

Port Sulphur (USC00167471) is a weather station in Louisiana, United States at 29.48 latitude and -89.70 longitude, 3 m (10 ft) above sea level.
The station reports from 1935 to 1964, 30 years of record.
1,464 records set at Port Sulphur still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Louisiana, United States, 29.48 latitude, -89.70 longitude.
Elevation: 3 m (10 ft).
Period of record: 1935 to 1964, 30 years.
Eligible elements: none yet.

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 Port Sulphur. 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 Port Sulphur, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	30.0 C (86.0 F)	-10.6 C (12.9 F)	n/a	n/a
Feb	32.2 C (90.0 F)	-6.7 C (19.9 F)	n/a	n/a
Mar	31.7 C (89.1 F)	-2.2 C (28.0 F)	n/a	n/a
Apr	36.1 C (97.0 F)	3.3 C (37.9 F)	n/a	n/a
May	35.6 C (96.1 F)	8.9 C (48.0 F)	n/a	n/a
Jun	37.2 C (99.0 F)	14.4 C (57.9 F)	n/a	n/a
Jul	37.8 C (100.0 F)	17.2 C (63.0 F)	n/a	n/a
Aug	38.9 C (102.0 F)	18.3 C (64.9 F)	n/a	n/a
Sep	36.7 C (98.1 F)	12.8 C (55.0 F)	n/a	n/a
Oct	35.0 C (95.0 F)	4.4 C (39.9 F)	n/a	n/a
Nov	31.7 C (89.1 F)	-3.3 C (26.1 F)	n/a	n/a
Dec	28.9 C (84.0 F)	-6.7 C (19.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Port Sulphur still stand. 1937 holds the most, with 81.

Standing records at Port Sulphur by the year they were set
Year set	Standing records
1935	31
1936	59
1937	81
1938	69
1939	45
1940	63
1941	44
1942	30
1943	38
1944	49
1945	49
1946	35
1947	42
1948	56
1949	45
1950	52
1951	62
1952	50
1953	36
1954	42
1955	42
1956	30
1957	59
1958	44
1959	43
1960	46
1961	59
1962	58
1963	55
1964	50

Wettest Day of Each Month

Sep: 254.0 mm (10.0 in)

The wettest day on record for each calendar month at Port Sulphur. The most was 254.0 mm (10.0 in) on 18 September 1957.

Record daily precipitation for each month at Port Sulphur
Month	Record daily precipitation (mm)	Date
Jan	106.7 mm (4.2 in)	13 January 1944
Feb	117.3 mm (4.6 in)	14 February 1953
Mar	177.8 mm (7.0 in)	27 March 1946
Apr	172.7 mm (6.8 in)	1 April 1957
May	182.9 mm (7.2 in)	18 May 1958
Jun	152.4 mm (6.0 in)	20 June 1961
Jul	192.0 mm (7.6 in)	30 July 1951
Aug	132.1 mm (5.2 in)	24 August 1958
Sep	254.0 mm (10.0 in)	18 September 1957
Oct	114.8 mm (4.5 in)	31 October 1960
Nov	165.6 mm (6.5 in)	7 November 1943
Dec	127.0 mm (5.0 in)	14 December 1945

Period of Record Coverage

1935 to 1964

30 years of record at Port Sulphur, 1935 to 1964. 4 years have data for under 90 percent of days and are left out of rankings: 1935, 1938, 1947, 1949.

Days with data per year at Port Sulphur
Year	Days with data	Share of year	Complete
1935	150	41%	No
1936	361	99%	Yes
1937	360	99%	Yes
1938	300	82%	No
1939	345	95%	Yes
1940	330	90%	Yes
1941	364	100%	Yes
1942	363	99%	Yes
1943	364	100%	Yes
1944	363	99%	Yes
1945	363	99%	Yes
1946	357	98%	Yes
1947	323	88%	No
1948	342	93%	Yes
1949	276	76%	No
1950	362	99%	Yes
1951	363	99%	Yes
1952	365	100%	Yes
1953	363	99%	Yes
1954	342	94%	Yes
1955	358	98%	Yes
1956	360	98%	Yes
1957	363	99%	Yes
1958	364	100%	Yes
1959	364	100%	Yes
1960	363	99%	Yes
1961	353	97%	Yes
1962	360	99%	Yes
1963	353	97%	Yes
1964	345	94%	Yes

Latest Records

No records were set at this station in the latest data.

Climate Trend

21 complete years, 1937 to 1964

One stripe for each of 21 complete years at Port Sulphur, 1937 to 1964. Blue stripes are years cooler than the station's own mean of 21.1 C (69.9 F); red stripes are warmer. The coolest year was 1958, at 20.1 C (68.1 F), and the warmest was 1946, at 21.8 C (71.2 F). The strongest colour marks a difference of 1.1 C (2.0 F).

Annual mean temperature at Port Sulphur as warming stripes, 1937 to 1964
Year	Annual mean temperature	Difference from the station mean
1937	21.8 C	+0.70 C
1941	21.2 C	+0.11 C
1942	20.6 C	-0.49 C
1943	20.9 C	-0.16 C
1944	21.5 C	+0.40 C
1945	21.6 C	+0.58 C
1946	21.8 C	+0.75 C
1950	21.0 C	-0.06 C
1951	21.6 C	+0.57 C
1952	21.2 C	+0.11 C
1953	21.1 C	+0.04 C
1955	21.4 C	+0.36 C
1956	21.6 C	+0.57 C
1957	21.6 C	+0.52 C
1958	20.1 C	-1.00 C
1959	20.5 C	-0.54 C
1960	20.3 C	-0.79 C
1961	20.8 C	-0.28 C
1962	21.1 C	0.00 C
1963	20.5 C	-0.56 C
1964	20.3 C	-0.74 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1935 to 1964

Yearly extremes at Port Sulphur: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.9 C (102.0 F)	1951	36.1 C (97.0 F)	30
Coldest night (TNn)	-10.6 C (12.9 F)	1963	-1.7 C (28.9 F)	30
Wettest day (Rx1day)	254.0 mm (10.0 in)	1957	119.8 mm (4.7 in)	30
Wettest five days (Rx5day)	394.9 mm (15.5 in)	1957	175.0 mm (6.9 in)	30
Longest dry spell (CDD)	36 days	1962	24 days	30

Hottest day (TXx)

The hottest day of the year at Port Sulphur, 1935 to 1964. The record is 38.9 C (102.0 F) in 1951, marked on the chart; the median year is 36.1 C (97.0 F).

Hottest day (TXx) at Port Sulphur by year
Year	Hottest day (TXx)
1935	35.6 C (96.1 F)
1936	36.7 C (98.1 F)
1937	37.8 C (100.0 F)
1938	37.2 C (99.0 F)
1939	36.7 C (98.1 F)
1940	35.0 C (95.0 F)
1941	35.6 C (96.1 F)
1942	35.6 C (96.1 F)
1943	37.8 C (100.0 F)
1944	36.1 C (97.0 F)
1945	35.0 C (95.0 F)
1946	35.6 C (96.1 F)
1947	35.6 C (96.1 F)
1948	35.6 C (96.1 F)
1949	36.1 C (97.0 F)
1950	36.7 C (98.1 F)
1951	38.9 C (102.0 F)
1952	36.7 C (98.1 F)
1953	37.2 C (99.0 F)
1954	36.7 C (98.1 F)
1955	35.6 C (96.1 F)
1956	36.1 C (97.0 F)
1957	36.7 C (98.1 F)
1958	35.6 C (96.1 F)
1959	35.6 C (96.1 F)
1960	36.1 C (97.0 F)
1961	35.0 C (95.0 F)
1962	36.7 C (98.1 F)
1963	37.2 C (99.0 F)
1964	36.7 C (98.1 F)

Coldest night (TNn)

The coldest night of the year at Port Sulphur, 1935 to 1964. The record is -10.6 C (12.9 F) in 1963, marked on the chart; the median year is -1.7 C (28.9 F).

Coldest night (TNn) at Port Sulphur by year
Year	Coldest night (TNn)
1935	0.0 C (32.0 F)
1936	-1.7 C (28.9 F)
1937	-1.1 C (30.0 F)
1938	-2.2 C (28.0 F)
1939	1.1 C (34.0 F)
1940	-6.1 C (21.0 F)
1941	-0.6 C (30.9 F)
1942	-3.9 C (25.0 F)
1943	-2.2 C (28.0 F)
1944	-1.1 C (30.0 F)
1945	-3.3 C (26.1 F)
1946	0.6 C (33.1 F)
1947	-1.7 C (28.9 F)
1948	-5.0 C (23.0 F)
1949	1.1 C (34.0 F)
1950	-4.4 C (24.1 F)
1951	-6.7 C (19.9 F)
1952	-0.6 C (30.9 F)
1953	-1.1 C (30.0 F)
1954	-0.6 C (30.9 F)
1955	-2.2 C (28.0 F)
1956	0.6 C (33.1 F)
1957	-2.8 C (27.0 F)
1958	-5.0 C (23.0 F)
1959	-1.1 C (30.0 F)
1960	-1.1 C (30.0 F)
1961	-1.7 C (28.9 F)
1962	-9.4 C (15.1 F)
1963	-10.6 C (12.9 F)
1964	-3.9 C (25.0 F)

Wettest day (Rx1day)

The wettest day of the year at Port Sulphur, 1935 to 1964. The record is 254.0 mm (10.0 in) in 1957, marked on the chart; the median year is 119.8 mm (4.7 in).

Wettest day (Rx1day) at Port Sulphur by year
Year	Wettest day (Rx1day)
1935	50.8 mm (2.0 in)
1936	59.7 mm (2.4 in)
1937	134.6 mm (5.3 in)
1938	83.8 mm (3.3 in)
1939	117.3 mm (4.6 in)
1940	95.5 mm (3.8 in)
1941	122.2 mm (4.8 in)
1942	111.3 mm (4.4 in)
1943	165.6 mm (6.5 in)
1944	147.3 mm (5.8 in)
1945	127.0 mm (5.0 in)
1946	177.8 mm (7.0 in)
1947	113.0 mm (4.4 in)
1948	134.6 mm (5.3 in)
1949	154.9 mm (6.1 in)
1950	83.6 mm (3.3 in)
1951	192.0 mm (7.6 in)
1952	69.9 mm (2.8 in)
1953	117.3 mm (4.6 in)
1954	88.9 mm (3.5 in)
1955	115.6 mm (4.6 in)
1956	204.2 mm (8.0 in)
1957	254.0 mm (10.0 in)
1958	182.9 mm (7.2 in)
1959	139.7 mm (5.5 in)
1960	114.8 mm (4.5 in)
1961	171.5 mm (6.8 in)
1962	55.1 mm (2.2 in)
1963	92.5 mm (3.6 in)
1964	171.5 mm (6.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Port Sulphur, 1935 to 1964. The record is 394.9 mm (15.5 in) in 1957, marked on the chart; the median year is 175.0 mm (6.9 in).

Wettest five days (Rx5day) at Port Sulphur by year
Year	Wettest five days (Rx5day)
1935	94.3 mm (3.7 in)
1936	108.0 mm (4.3 in)
1937	167.6 mm (6.6 in)
1938	182.9 mm (7.2 in)
1939	253.0 mm (10.0 in)
1940	195.3 mm (7.7 in)
1941	195.9 mm (7.7 in)
1942	169.8 mm (6.7 in)
1943	172.0 mm (6.8 in)
1944	234.0 mm (9.2 in)
1945	165.4 mm (6.5 in)
1946	222.2 mm (8.7 in)
1947	156.4 mm (6.2 in)
1948	332.5 mm (13.1 in)
1949	154.9 mm (6.1 in)
1950	127.1 mm (5.0 in)
1951	244.1 mm (9.6 in)
1952	127.2 mm (5.0 in)
1953	175.2 mm (6.9 in)
1954	154.9 mm (6.1 in)
1955	211.1 mm (8.3 in)
1956	304.3 mm (12.0 in)
1957	394.9 mm (15.5 in)
1958	246.4 mm (9.7 in)
1959	219.7 mm (8.6 in)
1960	136.1 mm (5.4 in)
1961	249.8 mm (9.8 in)
1962	130.1 mm (5.1 in)
1963	169.5 mm (6.7 in)
1964	174.8 mm (6.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Port Sulphur, 1935 to 1964. The record is 36 days in 1962, marked on the chart; the median year is 24 days.

Longest dry spell (CDD) at Port Sulphur by year
Year	Longest dry spell (CDD)
1935	35 days
1936	20 days
1937	34 days
1938	21 days
1939	23 days
1940	24 days
1941	23 days
1942	21 days
1943	24 days
1944	33 days
1945	18 days
1946	29 days
1947	29 days
1948	20 days
1949	26 days
1950	26 days
1951	31 days
1952	30 days
1953	30 days
1954	18 days
1955	33 days
1956	16 days
1957	21 days
1958	19 days
1959	18 days
1960	29 days
1961	16 days
1962	36 days
1963	35 days
1964	22 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.

Download the Data

Data for Port Sulphur standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Port Sulphur 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).