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
Record highRecord low2026 daily maximum2026 daily minimum
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
Year with most
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
Complete yearUnder 90 percent of days
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.
Cooler than the station meanWarmer than the station mean
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.