Bay Saint Louis Weather Records (USC00220519)

Record envelope, standing records and threshold days for Bay Saint Louis (USC00220519), Mississippi, United States, with 89 years of record.

Key Facts for Bay Saint Louis

Bay Saint Louis (USC00220519) is a weather station in Mississippi, United States at 30.30 latitude and -89.33 longitude, 6 m (20 ft) above sea level.
The station reports from 1891 to 1979, 89 years of record.
1,464 records set at Bay Saint Louis still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Bay Saint Louis set a daily record precipitation of 82.6 mm (3.3 in) on 25 November 1979.

About the Station

Location: Mississippi, United States, 30.30 latitude, -89.33 longitude.
Elevation: 6 m (20 ft).
Period of record: 1891 to 1979, 89 years.
Eligible elements: tmax, tmin, 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 Bay Saint Louis. 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 Bay Saint Louis, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	27.8 C (82.0 F)	-12.2 C (10.0 F)	n/a	n/a
Feb	28.3 C (82.9 F)	-16.7 C (1.9 F)	n/a	n/a
Mar	33.3 C (91.9 F)	-6.7 C (19.9 F)	n/a	n/a
Apr	33.3 C (91.9 F)	0.0 C (32.0 F)	n/a	n/a
May	36.1 C (97.0 F)	2.8 C (37.0 F)	n/a	n/a
Jun	38.9 C (102.0 F)	11.7 C (53.1 F)	n/a	n/a
Jul	40.0 C (104.0 F)	16.7 C (62.1 F)	n/a	n/a
Aug	39.4 C (102.9 F)	15.6 C (60.1 F)	n/a	n/a
Sep	39.4 C (102.9 F)	7.2 C (45.0 F)	n/a	n/a
Oct	36.1 C (97.0 F)	0.6 C (33.1 F)	n/a	n/a
Nov	32.2 C (90.0 F)	-6.1 C (21.0 F)	n/a	n/a
Dec	27.8 C (82.0 F)	-11.1 C (12.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Bay Saint Louis still stand. 1918 holds the most, with 37.

Standing records at Bay Saint Louis by the year they were set
Year set	Standing records
1891	8
1894	32
1895	15
1896	14
1897	21
1898	31
1899	31
1900	12
1901	23
1902	20
1903	11
1904	14
1905	9
1906	13
1907	20
1908	28
1909	11
1910	19
1911	32
1912	13
1913	16
1914	9
1915	18
1916	10
1917	36
1918	37
1919	14
1920	13
1921	24
1922	19
1923	19
1924	26
1925	15
1926	11
1927	28
1928	11
1929	23
1930	12
1931	21
1932	33
1933	18
1934	18
1935	23
1936	9
1937	32
1938	22
1939	9
1940	25
1941	11
1942	7
1943	19
1944	13
1945	18
1946	16
1947	10
1948	13
1949	8
1950	22
1951	18
1952	22
1953	20
1954	12
1955	10
1956	12
1957	23
1958	1
1959	5
1960	11
1961	10
1962	22
1963	13
1964	18
1965	9
1966	15
1967	15
1968	26
1969	18
1970	16
1971	10
1972	9
1973	15
1974	14
1975	13
1976	7
1977	13
1978	12
1979	10

All-Time Record Progression

5 new records

5 all-time records were set at Bay Saint Louis between 17 September 1927 and 27 April 1964. Each dot is a new record.

When Bay Saint Louis set new all-time records
Date	Kind	Detail
1927-09-17	Record high maximum temperature	Record high maximum temperature 39.4 C (102.9 F)
1932-05-17	Record daily precipitation	Record daily precipitation 258.1 mm (10.2 in)
1932-07-17	Record high maximum temperature	Record high maximum temperature 40.0 C (104.0 F)
1957-09-18	Record daily precipitation	Record daily precipitation 260.6 mm (10.3 in)
1964-04-27	Record daily precipitation	Record daily precipitation 275.6 mm (10.9 in)

Wettest Day of Each Month

Apr: 275.6 mm (10.9 in)

The wettest day on record for each calendar month at Bay Saint Louis. The most was 275.6 mm (10.9 in) on 27 April 1964.

Record daily precipitation for each month at Bay Saint Louis
Month	Record daily precipitation (mm)	Date
Jan	158.8 mm (6.3 in)	23 January 1965
Feb	146.1 mm (5.8 in)	13 February 1927
Mar	165.1 mm (6.5 in)	28 March 1922
Apr	275.6 mm (10.9 in)	27 April 1964
May	258.1 mm (10.2 in)	17 May 1932
Jun	241.3 mm (9.5 in)	12 June 1900
Jul	214.6 mm (8.4 in)	1 July 1941
Aug	170.2 mm (6.7 in)	16 August 1931
Sep	260.6 mm (10.3 in)	18 September 1957
Oct	148.8 mm (5.9 in)	18 October 1937
Nov	213.9 mm (8.4 in)	14 November 1961
Dec	133.1 mm (5.2 in)	22 December 1907

Period of Record Coverage

1891 to 1979

88 years of record at Bay Saint Louis, 1891 to 1979. 8 years have data for under 90 percent of days and are left out of rankings: 1891, 1892, 1894, 1895, 1896, 1903, 1918, 1979.

Days with data per year at Bay Saint Louis
Year	Days with data	Share of year	Complete
1891	232	64%	No
1892	59	16%	No
1894	275	75%	No
1895	257	70%	No
1896	329	90%	No
1897	361	99%	Yes
1898	362	99%	Yes
1899	364	100%	Yes
1900	362	99%	Yes
1901	360	99%	Yes
1902	362	99%	Yes
1903	239	65%	No
1904	364	99%	Yes
1905	363	99%	Yes
1906	365	100%	Yes
1907	360	99%	Yes
1908	360	98%	Yes
1909	365	100%	Yes
1910	364	100%	Yes
1911	365	100%	Yes
1912	364	99%	Yes
1913	365	100%	Yes
1914	365	100%	Yes
1915	364	100%	Yes
1916	353	96%	Yes
1917	356	98%	Yes
1918	327	90%	No
1919	363	99%	Yes
1920	365	100%	Yes
1921	363	99%	Yes
1922	365	100%	Yes
1923	364	100%	Yes
1924	361	99%	Yes
1925	354	97%	Yes
1926	362	99%	Yes
1927	355	97%	Yes
1928	365	100%	Yes
1929	365	100%	Yes
1930	359	98%	Yes
1931	364	100%	Yes
1932	331	90%	Yes
1933	365	100%	Yes
1934	364	100%	Yes
1935	360	99%	Yes
1936	358	98%	Yes
1937	364	100%	Yes
1938	357	98%	Yes
1939	360	99%	Yes
1940	365	100%	Yes
1941	363	99%	Yes
1942	361	99%	Yes
1943	361	99%	Yes
1944	366	100%	Yes
1945	364	100%	Yes
1946	362	99%	Yes
1947	330	90%	Yes
1948	365	100%	Yes
1949	359	98%	Yes
1950	362	99%	Yes
1951	345	95%	Yes
1952	338	92%	Yes
1953	359	98%	Yes
1954	340	93%	Yes
1955	345	95%	Yes
1956	361	99%	Yes
1957	360	99%	Yes
1958	362	99%	Yes
1959	358	98%	Yes
1960	358	98%	Yes
1961	364	100%	Yes
1962	362	99%	Yes
1963	363	99%	Yes
1964	363	99%	Yes
1965	348	95%	Yes
1966	347	95%	Yes
1967	360	99%	Yes
1968	355	97%	Yes
1969	330	90%	Yes
1970	357	98%	Yes
1971	360	99%	Yes
1972	360	98%	Yes
1973	357	98%	Yes
1974	358	98%	Yes
1975	359	98%	Yes
1976	348	95%	Yes
1977	359	98%	Yes
1978	358	98%	Yes
1979	299	82%	No

Latest Records

Latest records at Bay Saint Louis
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
25 November 1979	Bay Saint Louis, US	daily rain	82.6 mm (3.3 in)	25.2 mm (1.0 in)	24 years	28 of 100 (Routine)
22 October 1979	Bay Saint Louis, US	daily high min	22.8 C (73.0 F)	0.6 C (1.1 F)	60 years	27 of 100 (Routine)
5 October 1979	Bay Saint Louis, US	daily low min	10.0 C (50.0 F)	0.6 C (1.1 F)	4 years	10 of 100 (Routine)
26 September 1979	Bay Saint Louis, US	daily low max (Tie)	23.9 C (75.0 F)	tie	4 years	2 of 100 (Routine)
17 August 1979	Bay Saint Louis, US	daily high max	37.2 C (99.0 F)	1.1 C (2.0 F)	38 years	24 of 100 (Routine)
21 July 1979	Bay Saint Louis, US	daily rain	86.6 mm (3.4 in)	14.2 mm (0.6 in)	45 years	28 of 100 (Routine)
11 July 1979	Bay Saint Louis, US	daily low max	27.2 C (81.0 F)	0.6 C (1.1 F)	84 years	35 of 100 (Notable)
2 July 1979	Bay Saint Louis, US	daily high max (Tie)	36.1 C (97.0 F)	tie	1 year	2 of 100 (Routine)
31 May 1979	Bay Saint Louis, US	daily low max	25.6 C (78.1 F)	0.5 C (0.9 F)	72 years	31 of 100 (Routine)
26 May 1979	Bay Saint Louis, US	daily low min	9.4 C (48.9 F)	2.3 C (4.1 F)	10 years	17 of 100 (Routine)
23 May 1979	Bay Saint Louis, US	daily rain	62.7 mm (2.5 in)	1.0 mm (0.04 in)	4 years	9 of 100 (Routine)
2 April 1979	Bay Saint Louis, US	daily high min	20.6 C (69.1 F)	0.6 C (1.1 F)	73 years	31 of 100 (Routine)
24 February 1979	Bay Saint Louis, US	daily rain	74.9 mm (2.9 in)	8.4 mm (0.33 in)	67 years	32 of 100 (Routine)
6 February 1979	Bay Saint Louis, US	daily low max	6.1 C (43.0 F)	2.8 C (5.0 F)	43 years	25 of 100 (Routine)
9 January 1979	Bay Saint Louis, US	daily low min	-6.7 C (19.9 F)	0.6 C (1.1 F)	3 years	8 of 100 (Routine)
3 January 1979	Bay Saint Louis, US	daily low max	1.1 C (34.0 F)	1.7 C (3.1 F)	51 years	26 of 100 (Routine)
21 December 1978	Bay Saint Louis, US	daily high max (Tie)	23.3 C (73.9 F)	tie	56 years	6 of 100 (Routine)
20 December 1978	Bay Saint Louis, US	daily high max	23.9 C (75.0 F)	1.7 C (3.1 F)	67 years	31 of 100 (Routine)
9 December 1978	Bay Saint Louis, US	daily high max (Tie)	23.9 C (75.0 F)	tie	59 years	6 of 100 (Routine)
4 December 1978	Bay Saint Louis, US	daily rain	43.7 mm (1.7 in)	17.8 mm (0.7 in)	25 years	24 of 100 (Routine)

Climate Trend

70 complete years, 1897 to 1978

One stripe for each of 70 complete years at Bay Saint Louis, 1897 to 1978. Blue stripes are years cooler than the station's own mean of 19.9 C (67.9 F); red stripes are warmer. The coolest year was 1976, at 18.6 C (65.4 F), and the warmest was 1921, at 21.5 C (70.6 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Bay Saint Louis as warming stripes, 1897 to 1978
Year	Annual mean temperature	Difference from the station mean
1897	20.4 C	+0.46 C
1898	19.3 C	-0.68 C
1899	19.6 C	-0.35 C
1900	19.7 C	-0.25 C
1901	19.1 C	-0.83 C
1902	20.3 C	+0.34 C
1904	19.8 C	-0.11 C
1905	19.8 C	-0.16 C
1906	19.8 C	-0.11 C
1907	20.4 C	+0.48 C
1908	20.5 C	+0.54 C
1909	20.2 C	+0.26 C
1910	19.8 C	-0.19 C
1911	21.3 C	+1.32 C
1912	19.5 C	-0.42 C
1913	19.9 C	0.00 C
1914	19.6 C	-0.34 C
1915	19.8 C	-0.10 C
1916	20.0 C	+0.04 C
1917	19.3 C	-0.66 C
1920	19.9 C	-0.09 C
1921	21.5 C	+1.52 C
1922	21.4 C	+1.41 C
1923	20.2 C	+0.24 C
1924	20.0 C	+0.02 C
1925	20.6 C	+0.69 C
1926	20.1 C	+0.18 C
1927	21.3 C	+1.35 C
1928	20.0 C	+0.03 C
1929	20.2 C	+0.29 C
1930	20.2 C	+0.26 C
1931	20.0 C	+0.10 C
1933	20.7 C	+0.78 C
1934	19.7 C	-0.20 C
1935	19.9 C	-0.05 C
1936	19.8 C	-0.11 C
1937	20.1 C	+0.17 C
1938	21.1 C	+1.19 C
1939	20.8 C	+0.84 C
1940	18.9 C	-1.00 C
1941	20.4 C	+0.48 C
1942	19.8 C	-0.19 C
1943	20.2 C	+0.23 C
1944	20.6 C	+0.69 C
1945	20.9 C	+0.95 C
1946	20.9 C	+0.94 C
1948	20.6 C	+0.61 C
1950	20.2 C	+0.28 C
1954	20.1 C	+0.15 C
1955	20.1 C	+0.12 C
1956	20.3 C	+0.39 C
1957	20.7 C	+0.73 C
1958	19.1 C	-0.85 C
1959	19.2 C	-0.75 C
1960	18.9 C	-1.02 C
1961	19.1 C	-0.84 C
1962	19.9 C	-0.01 C
1963	19.2 C	-0.76 C
1964	19.3 C	-0.68 C
1966	18.7 C	-1.20 C
1967	19.1 C	-0.89 C
1970	19.1 C	-0.89 C
1971	19.7 C	-0.25 C
1972	19.8 C	-0.14 C
1973	19.7 C	-0.29 C
1974	19.7 C	-0.28 C
1975	19.5 C	-0.44 C
1976	18.6 C	-1.37 C
1977	19.4 C	-0.56 C
1978	19.1 C	-0.88 C

The annual mean temperature here has fallen by 0.09 C (0.03 to 0.15) per decade over 1897 to 1978. In Fahrenheit: 0.16 F (0.05 to 0.27) per decade. The slope is a straight line fitted to 70 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Bay Saint Louis
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.09 C (-0.15 to -0.03) per decade	-0.16 F (-0.27 to -0.05) per decade	1897 to 1978	70	Fall
Mean daily maximum	-0.09 C (-0.16 to -0.01) per decade	-0.15 F (-0.30 to -0.01) per decade	1897 to 1978	70	Fall
Mean daily minimum	-0.09 C (-0.16 to -0.02) per decade	-0.17 F (-0.29 to -0.04) per decade	1897 to 1978	70	Fall

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

1891 to 1979

Yearly extremes at Bay Saint Louis: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	1932	36.7 C (98.1 F)	88
Coldest night (TNn)	-16.7 C (1.9 F)	1899	-5.0 C (23.0 F)	88
Wettest day (Rx1day)	275.6 mm (10.9 in)	1964	111.7 mm (4.4 in)	88
Wettest five days (Rx5day)	419.5 mm (16.5 in)	1932	165.1 mm (6.5 in)	88
Longest dry spell (CDD)	71 days	1952	24 days	88

Hottest day (TXx)

The hottest day of the year at Bay Saint Louis, 1891 to 1979. The record is 40.0 C (104.0 F) in 1932, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at Bay Saint Louis by year
Year	Hottest day (TXx)
1891	33.9 C (93.0 F)
1892	28.9 C (84.0 F)
1894	37.8 C (100.0 F)
1895	32.8 C (91.0 F)
1896	35.0 C (95.0 F)
1897	36.7 C (98.1 F)
1898	37.2 C (99.0 F)
1899	38.3 C (100.9 F)
1900	36.1 C (97.0 F)
1901	38.9 C (102.0 F)
1902	37.8 C (100.0 F)
1903	34.4 C (93.9 F)
1904	36.1 C (97.0 F)
1905	37.8 C (100.0 F)
1906	36.1 C (97.0 F)
1907	36.1 C (97.0 F)
1908	35.0 C (95.0 F)
1909	35.6 C (96.1 F)
1910	35.6 C (96.1 F)
1911	37.2 C (99.0 F)
1912	37.2 C (99.0 F)
1913	37.2 C (99.0 F)
1914	37.8 C (100.0 F)
1915	36.7 C (98.1 F)
1916	35.6 C (96.1 F)
1917	36.7 C (98.1 F)
1918	38.9 C (102.0 F)
1919	36.1 C (97.0 F)
1920	36.7 C (98.1 F)
1921	37.2 C (99.0 F)
1922	35.6 C (96.1 F)
1923	35.0 C (95.0 F)
1924	38.9 C (102.0 F)
1925	37.8 C (100.0 F)
1926	36.7 C (98.1 F)
1927	39.4 C (102.9 F)
1928	36.7 C (98.1 F)
1929	35.6 C (96.1 F)
1930	38.9 C (102.0 F)
1931	37.8 C (100.0 F)
1932	40.0 C (104.0 F)
1933	35.6 C (96.1 F)
1934	36.7 C (98.1 F)
1935	37.2 C (99.0 F)
1936	36.7 C (98.1 F)
1937	36.7 C (98.1 F)
1938	37.8 C (100.0 F)
1939	36.7 C (98.1 F)
1940	36.1 C (97.0 F)
1941	36.7 C (98.1 F)
1942	36.7 C (98.1 F)
1943	37.8 C (100.0 F)
1944	37.8 C (100.0 F)
1945	36.1 C (97.0 F)
1946	35.6 C (96.1 F)
1947	39.4 C (102.9 F)
1948	36.7 C (98.1 F)
1949	35.6 C (96.1 F)
1950	36.7 C (98.1 F)
1951	37.8 C (100.0 F)
1952	37.8 C (100.0 F)
1953	37.8 C (100.0 F)
1954	38.9 C (102.0 F)
1955	36.7 C (98.1 F)
1956	37.8 C (100.0 F)
1957	37.8 C (100.0 F)
1958	35.0 C (95.0 F)
1959	35.6 C (96.1 F)
1960	37.8 C (100.0 F)
1961	36.1 C (97.0 F)
1962	37.2 C (99.0 F)
1963	37.2 C (99.0 F)
1964	36.7 C (98.1 F)
1965	36.1 C (97.0 F)
1966	35.6 C (96.1 F)
1967	35.6 C (96.1 F)
1968	36.1 C (97.0 F)
1969	38.3 C (100.9 F)
1970	36.7 C (98.1 F)
1971	35.6 C (96.1 F)
1972	37.2 C (99.0 F)
1973	36.7 C (98.1 F)
1974	36.7 C (98.1 F)
1975	35.0 C (95.0 F)
1976	37.2 C (99.0 F)
1977	36.7 C (98.1 F)
1978	37.2 C (99.0 F)
1979	37.2 C (99.0 F)

Coldest night (TNn)

The coldest night of the year at Bay Saint Louis, 1891 to 1979. The record is -16.7 C (1.9 F) in 1899, marked on the chart; the median year is -5.0 C (23.0 F).

Coldest night (TNn) at Bay Saint Louis by year
Year	Coldest night (TNn)
1891	0.6 C (33.1 F)
1892	7.2 C (45.0 F)
1894	-7.8 C (18.0 F)
1895	-11.1 C (12.0 F)
1896	-3.9 C (25.0 F)
1897	-7.2 C (19.0 F)
1898	-7.2 C (19.0 F)
1899	-16.7 C (1.9 F)
1900	-7.8 C (18.0 F)
1901	-7.2 C (19.0 F)
1902	-3.3 C (26.1 F)
1903	-4.4 C (24.1 F)
1904	-4.4 C (24.1 F)
1905	-9.4 C (15.1 F)
1906	-2.8 C (27.0 F)
1907	-0.6 C (30.9 F)
1908	-2.2 C (28.0 F)
1909	-4.4 C (24.1 F)
1910	-4.4 C (24.1 F)
1911	-7.8 C (18.0 F)
1912	-6.7 C (19.9 F)
1913	-2.2 C (28.0 F)
1914	-3.9 C (25.0 F)
1915	-3.3 C (26.1 F)
1916	-5.0 C (23.0 F)
1917	-9.4 C (15.1 F)
1918	-10.0 C (14.0 F)
1919	-1.1 C (30.0 F)
1920	-3.3 C (26.1 F)
1921	0.0 C (32.0 F)
1922	-2.2 C (28.0 F)
1923	-2.2 C (28.0 F)
1924	-10.0 C (14.0 F)
1925	-7.8 C (18.0 F)
1926	-2.2 C (28.0 F)
1927	-6.1 C (21.0 F)
1928	-7.2 C (19.0 F)
1929	-7.8 C (18.0 F)
1930	-7.8 C (18.0 F)
1931	-3.9 C (25.0 F)
1932	-6.1 C (21.0 F)
1933	-8.3 C (17.1 F)
1934	-4.4 C (24.1 F)
1935	-6.7 C (19.9 F)
1936	-4.4 C (24.1 F)
1937	-3.9 C (25.0 F)
1938	-3.3 C (26.1 F)
1939	-1.1 C (30.0 F)
1940	-10.0 C (14.0 F)
1941	-2.8 C (27.0 F)
1942	-7.8 C (18.0 F)
1943	-5.0 C (23.0 F)
1944	-3.3 C (26.1 F)
1945	-5.6 C (21.9 F)
1946	-1.1 C (30.0 F)
1947	-3.9 C (25.0 F)
1948	-7.8 C (18.0 F)
1949	-2.8 C (27.0 F)
1950	-3.3 C (26.1 F)
1951	-8.3 C (17.1 F)
1952	-0.6 C (30.9 F)
1953	-2.8 C (27.0 F)
1954	-2.8 C (27.0 F)
1955	-5.0 C (23.0 F)
1956	-1.7 C (28.9 F)
1957	-6.7 C (19.9 F)
1958	-7.8 C (18.0 F)
1959	-2.8 C (27.0 F)
1960	-5.0 C (23.0 F)
1961	-3.9 C (25.0 F)
1962	-12.2 C (10.0 F)
1963	-12.2 C (10.0 F)
1964	-6.1 C (21.0 F)
1965	-6.7 C (19.9 F)
1966	-10.6 C (12.9 F)
1967	-2.8 C (27.0 F)
1968	-3.9 C (25.0 F)
1969	-5.0 C (23.0 F)
1970	-6.7 C (19.9 F)
1971	-3.9 C (25.0 F)
1972	-6.1 C (21.0 F)
1973	-5.0 C (23.0 F)
1974	-2.2 C (28.0 F)
1975	-6.1 C (21.0 F)
1976	-6.1 C (21.0 F)
1977	-10.6 C (12.9 F)
1978	-5.0 C (23.0 F)
1979	-6.7 C (19.9 F)

Wettest day (Rx1day)

The wettest day of the year at Bay Saint Louis, 1891 to 1979. The record is 275.6 mm (10.9 in) in 1964, marked on the chart; the median year is 111.7 mm (4.4 in).

Wettest day (Rx1day) at Bay Saint Louis by year
Year	Wettest day (Rx1day)
1891	81.3 mm (3.2 in)
1892	243.8 mm (9.6 in)
1894	111.8 mm (4.4 in)
1895	99.1 mm (3.9 in)
1896	68.6 mm (2.7 in)
1897	126.2 mm (5.0 in)
1898	93.5 mm (3.7 in)
1899	111.5 mm (4.4 in)
1900	241.3 mm (9.5 in)
1901	117.6 mm (4.6 in)
1902	110.7 mm (4.4 in)
1903	88.9 mm (3.5 in)
1904	66.5 mm (2.6 in)
1905	71.6 mm (2.8 in)
1906	100.1 mm (3.9 in)
1907	133.1 mm (5.2 in)
1908	117.9 mm (4.6 in)
1909	132.1 mm (5.2 in)
1910	62.5 mm (2.5 in)
1911	95.8 mm (3.8 in)
1912	140.2 mm (5.5 in)
1913	127.0 mm (5.0 in)
1914	106.7 mm (4.2 in)
1915	144.8 mm (5.7 in)
1916	126.5 mm (5.0 in)
1917	64.8 mm (2.6 in)
1918	116.8 mm (4.6 in)
1919	71.1 mm (2.8 in)
1920	137.2 mm (5.4 in)
1921	76.2 mm (3.0 in)
1922	165.1 mm (6.5 in)
1923	91.4 mm (3.6 in)
1924	59.7 mm (2.4 in)
1925	215.9 mm (8.5 in)
1926	152.4 mm (6.0 in)
1927	221.5 mm (8.7 in)
1928	134.6 mm (5.3 in)
1929	175.3 mm (6.9 in)
1930	100.3 mm (3.9 in)
1931	203.2 mm (8.0 in)
1932	258.1 mm (10.2 in)
1933	132.1 mm (5.2 in)
1934	86.4 mm (3.4 in)
1935	170.2 mm (6.7 in)
1936	94.0 mm (3.7 in)
1937	148.8 mm (5.9 in)
1938	125.7 mm (4.9 in)
1939	125.7 mm (4.9 in)
1940	77.5 mm (3.1 in)
1941	214.6 mm (8.4 in)
1942	129.3 mm (5.1 in)
1943	106.7 mm (4.2 in)
1944	90.2 mm (3.6 in)
1945	55.9 mm (2.2 in)
1946	108.0 mm (4.3 in)
1947	213.4 mm (8.4 in)
1948	103.6 mm (4.1 in)
1949	92.5 mm (3.6 in)
1950	52.3 mm (2.1 in)
1951	99.1 mm (3.9 in)
1952	95.3 mm (3.8 in)
1953	154.7 mm (6.1 in)
1954	147.3 mm (5.8 in)
1955	147.8 mm (5.8 in)
1956	180.8 mm (7.1 in)
1957	260.6 mm (10.3 in)
1958	113.0 mm (4.4 in)
1959	152.4 mm (6.0 in)
1960	149.9 mm (5.9 in)
1961	213.9 mm (8.4 in)
1962	58.4 mm (2.3 in)
1963	68.6 mm (2.7 in)
1964	275.6 mm (10.9 in)
1965	158.8 mm (6.3 in)
1966	81.3 mm (3.2 in)
1967	138.7 mm (5.5 in)
1968	95.8 mm (3.8 in)
1969	85.6 mm (3.4 in)
1970	84.1 mm (3.3 in)
1971	78.7 mm (3.1 in)
1972	79.2 mm (3.1 in)
1973	92.7 mm (3.6 in)
1974	123.2 mm (4.9 in)
1975	72.1 mm (2.8 in)
1976	88.1 mm (3.5 in)
1977	88.9 mm (3.5 in)
1978	183.4 mm (7.2 in)
1979	89.9 mm (3.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Bay Saint Louis, 1891 to 1979. The record is 419.5 mm (16.5 in) in 1932, marked on the chart; the median year is 165.1 mm (6.5 in).

Wettest five days (Rx5day) at Bay Saint Louis by year
Year	Wettest five days (Rx5day)
1891	121.9 mm (4.8 in)
1892	269.2 mm (10.6 in)
1894	95.5 mm (3.8 in)
1895	121.5 mm (4.8 in)
1896	98.3 mm (3.9 in)
1897	178.9 mm (7.0 in)
1898	184.1 mm (7.2 in)
1899	148.1 mm (5.8 in)
1900	264.9 mm (10.4 in)
1901	188.2 mm (7.4 in)
1902	117.7 mm (4.6 in)
1903	144.1 mm (5.7 in)
1904	118.9 mm (4.7 in)
1905	147.1 mm (5.8 in)
1906	127.5 mm (5.0 in)
1907	229.8 mm (9.0 in)
1908	336.0 mm (13.2 in)
1909	224.0 mm (8.8 in)
1910	108.8 mm (4.3 in)
1911	153.8 mm (6.1 in)
1912	243.4 mm (9.6 in)
1913	150.6 mm (5.9 in)
1914	114.6 mm (4.5 in)
1915	175.1 mm (6.9 in)
1916	170.9 mm (6.7 in)
1917	107.2 mm (4.2 in)
1918	162.5 mm (6.4 in)
1919	119.9 mm (4.7 in)
1920	203.2 mm (8.0 in)
1921	91.7 mm (3.6 in)
1922	201.9 mm (7.9 in)
1923	134.7 mm (5.3 in)
1924	72.4 mm (2.9 in)
1925	252.2 mm (9.9 in)
1926	261.1 mm (10.3 in)
1927	244.1 mm (9.6 in)
1928	185.4 mm (7.3 in)
1929	279.7 mm (11.0 in)
1930	155.4 mm (6.1 in)
1931	260.9 mm (10.3 in)
1932	419.5 mm (16.5 in)
1933	220.5 mm (8.7 in)
1934	134.4 mm (5.3 in)
1935	170.2 mm (6.7 in)
1936	142.3 mm (5.6 in)
1937	182.1 mm (7.2 in)
1938	152.4 mm (6.0 in)
1939	160.5 mm (6.3 in)
1940	147.2 mm (5.8 in)
1941	259.3 mm (10.2 in)
1942	198.4 mm (7.8 in)
1943	205.2 mm (8.1 in)
1944	154.4 mm (6.1 in)
1945	133.4 mm (5.3 in)
1946	195.6 mm (7.7 in)
1947	232.2 mm (9.1 in)
1948	273.2 mm (10.8 in)
1949	167.7 mm (6.6 in)
1950	82.8 mm (3.3 in)
1951	197.3 mm (7.8 in)
1952	158.5 mm (6.2 in)
1953	154.7 mm (6.1 in)
1954	147.3 mm (5.8 in)
1955	273.6 mm (10.8 in)
1956	198.1 mm (7.8 in)
1957	283.0 mm (11.1 in)
1958	175.7 mm (6.9 in)
1959	171.2 mm (6.7 in)
1960	233.4 mm (9.2 in)
1961	243.7 mm (9.6 in)
1962	78.7 mm (3.1 in)
1963	133.9 mm (5.3 in)
1964	290.8 mm (11.4 in)
1965	177.6 mm (7.0 in)
1966	123.8 mm (4.9 in)
1967	148.9 mm (5.9 in)
1968	97.1 mm (3.8 in)
1969	137.4 mm (5.4 in)
1970	107.8 mm (4.2 in)
1971	129.3 mm (5.1 in)
1972	148.6 mm (5.9 in)
1973	180.4 mm (7.1 in)
1974	156.2 mm (6.1 in)
1975	201.4 mm (7.9 in)
1976	147.7 mm (5.8 in)
1977	108.9 mm (4.3 in)
1978	198.6 mm (7.8 in)
1979	234.2 mm (9.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Bay Saint Louis, 1891 to 1979. The record is 71 days in 1952, marked on the chart; the median year is 24 days.

Longest dry spell (CDD) at Bay Saint Louis by year
Year	Longest dry spell (CDD)
1891	36 days
1892	22 days
1894	47 days
1895	19 days
1896	18 days
1897	26 days
1898	22 days
1899	45 days
1900	23 days
1901	21 days
1902	22 days
1903	30 days
1904	16 days
1905	16 days
1906	27 days
1907	14 days
1908	18 days
1909	20 days
1910	24 days
1911	35 days
1912	13 days
1913	34 days
1914	28 days
1915	35 days
1916	21 days
1917	28 days
1918	24 days
1919	15 days
1920	21 days
1921	26 days
1922	19 days
1923	16 days
1924	44 days
1925	33 days
1926	25 days
1927	24 days
1928	17 days
1929	22 days
1930	28 days
1931	23 days
1932	18 days
1933	22 days
1934	23 days
1935	37 days
1936	18 days
1937	25 days
1938	21 days
1939	23 days
1940	35 days
1941	24 days
1942	23 days
1943	24 days
1944	32 days
1945	32 days
1946	26 days
1947	20 days
1948	24 days
1949	38 days
1950	16 days
1951	25 days
1952	71 days
1953	38 days
1954	25 days
1955	28 days
1956	21 days
1957	15 days
1958	22 days
1959	20 days
1960	26 days
1961	21 days
1962	35 days
1963	34 days
1964	22 days
1965	30 days
1966	20 days
1967	23 days
1968	15 days
1969	28 days
1970	20 days
1971	40 days
1972	23 days
1973	15 days
1974	19 days
1975	19 days
1976	24 days
1977	27 days
1978	38 days
1979	26 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.

Frost Dates and Growing Season

60 years with a frost

Across 60 years with a frost, the median last spring frost at Bay Saint Louis falls on 24 February and the median first autumn frost on 29 November, which leaves a median of 278 days between them.

In 1937 to 1978 the median growing season was 284 days. That is 11 days more than in 1897 to 1936.

Fitted over all years, the growing season changes by +1.8 days per decade at this station.

Frost dates and growing season at Bay Saint Louis
Measure	Median, all years	Earliest period (1897 to 1936)	Recent period (1937 to 1978)	Recent against earliest	Fitted trend
Last spring frost	24 February	1 March	23 February	6 days earlier	-1.1 days per decade
First autumn frost	29 November	27 November	1 December	4 days later	+0.6 days per decade
Growing days	278 days	273 days	284 days	11 days more	+1.8 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

80 years, 1897 to 1979

A day with at least 113.2 mm (4.5 in) of rain is expected about once in 2 years. A day with at least 297.5 mm (11.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Bay Saint Louis: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	113.2 mm (4.5 in)
5 years	157.6 mm (6.2 in)
10 years	188.9 mm (7.4 in)
25 years	230.7 mm (9.1 in)
50 years	263.5 mm (10.4 in)
100 years	297.5 mm (11.7 in)	Longer than the 80 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, 80 years of values from 1897 to 1979.

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: 275.6 mm (10.9 in) in 1964; 260.6 mm (10.3 in) in 1957; 241.3 mm (9.5 in) in 1900.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Bay Saint Louis, at 1964. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1964 ran 0.3 C (0.5 F) lower than in the years before (likely change).

Suspected changes in the annual mean temperature at Bay Saint Louis, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1964	-0.3	-0.5	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

Data for Bay Saint Louis standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Bay Saint Louis 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 2026-10-17 (17 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).