Record envelope, standing records and threshold days for Bay St Louis Nasa (USC00220521), Mississippi, United States, with 33 years of record.
Key Facts for Bay St Louis Nasa
Bay St Louis Nasa (USC00220521) is a weather station in Mississippi, United States at 30.38 latitude and -89.60 longitude, 9 m (30 ft) above sea level.
The station reports from 1979 to 2011, 33 years of record.
1,464 records set at Bay St Louis Nasa still stand.
Records are tracked for tmax, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Bay St Louis Nasa tied a daily record high maximum temperature of 27.8 C (82.0 F) on 22 November 2011.
About the Station
Location: Mississippi, United States, 30.38 latitude, -89.60 longitude.
Elevation: 9 m (30 ft).
Period of record: 1979 to 2011, 33 years.
Eligible elements: tmax, 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 St Louis Nasa. 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 St Louis Nasa, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
28.3 C (82.9 F)
-15.0 C (5.0 F)
n/a
n/a
Feb
29.4 C (84.9 F)
-12.8 C (9.0 F)
n/a
n/a
Mar
31.1 C (88.0 F)
-6.7 C (19.9 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-2.2 C (28.0 F)
n/a
n/a
May
36.7 C (98.1 F)
5.0 C (41.0 F)
n/a
n/a
Jun
38.3 C (100.9 F)
8.9 C (48.0 F)
n/a
n/a
Jul
40.0 C (104.0 F)
16.7 C (62.1 F)
n/a
n/a
Aug
40.0 C (104.0 F)
12.8 C (55.0 F)
n/a
n/a
Sep
39.4 C (102.9 F)
6.7 C (44.1 F)
n/a
n/a
Oct
36.1 C (97.0 F)
-1.1 C (30.0 F)
n/a
n/a
Nov
31.1 C (88.0 F)
-4.4 C (24.1 F)
n/a
n/a
Dec
28.3 C (82.9 F)
-12.2 C (10.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Bay St Louis Nasa still stand. 2000 holds the most, with 81.
Standing records at Bay St Louis Nasa by the year they were set
Year set
Standing records
1979
63
1980
77
1981
52
1982
54
1983
39
1984
60
1985
59
1986
39
1987
55
1988
55
1989
77
1990
57
1991
39
1992
28
1993
40
1994
36
1995
61
1996
53
1997
56
1998
47
1999
64
2000
81
2001
28
2002
33
2003
34
2004
27
2005
21
2006
21
2007
26
2008
33
2009
7
2010
18
2011
24
Wettest Day of Each Month
Oct: 389.1 mm (15.3 in)
The wettest day on record for each calendar month at Bay St Louis Nasa. The most was 389.1 mm (15.3 in) on 29 October 1991.
Record daily precipitation for each month at Bay St Louis Nasa
Month
Record daily precipitation (mm)
Date
Jan
152.4 mm (6.0 in)
6 January 1991
Feb
111.5 mm (4.4 in)
17 February 1992
Mar
140.7 mm (5.5 in)
30 March 1996
Apr
231.1 mm (9.1 in)
15 April 1996
May
300.0 mm (11.8 in)
10 May 1995
Jun
126.0 mm (5.0 in)
8 June 1989
Jul
93.5 mm (3.7 in)
23 July 2003
Aug
139.7 mm (5.5 in)
26 August 1992
Sep
134.6 mm (5.3 in)
1 September 2008
Oct
389.1 mm (15.3 in)
29 October 1991
Nov
128.8 mm (5.1 in)
29 November 1997
Dec
109.7 mm (4.3 in)
3 December 1990
Period of Record Coverage
1979 to 2011
Complete yearUnder 90 percent of days
33 years of record at Bay St Louis Nasa, 1979 to 2011. 7 years have data for under 90 percent of days and are left out of rankings: 2004, 2005, 2007, 2008, 2009, 2010, 2011.
Cooler than the station meanWarmer than the station mean
One stripe for each of 22 complete years at Bay St Louis Nasa, 1979 to 2006. Blue stripes are years cooler than the station's own mean of 19.4 C (66.8 F); red stripes are warmer. The coolest year was 1987, at 18.7 C (65.7 F), and the warmest was 1990, at 20.4 C (68.7 F). The strongest colour marks a difference of 1.1 C (2.0 F).
Annual mean temperature at Bay St Louis Nasa as warming stripes, 1979 to 2006
Year
Annual mean temperature
Difference from the station mean
1979
19.2 C
-0.13 C
1980
19.6 C
+0.21 C
1981
19.3 C
-0.09 C
1982
20.0 C
+0.65 C
1983
18.9 C
-0.50 C
1984
19.4 C
+0.07 C
1985
19.2 C
-0.19 C
1986
19.8 C
+0.39 C
1987
18.7 C
-0.62 C
1988
18.8 C
-0.53 C
1989
19.5 C
+0.12 C
1990
20.4 C
+1.01 C
1991
20.0 C
+0.60 C
1992
19.0 C
-0.37 C
1993
19.3 C
-0.02 C
1994
20.0 C
+0.60 C
1995
19.7 C
+0.29 C
1996
18.9 C
-0.45 C
1997
18.9 C
-0.50 C
2002
19.1 C
-0.25 C
2003
19.2 C
-0.15 C
2006
19.2 C
-0.21 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
1979 to 2011
Yearly extremes at Bay St Louis Nasa: 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)
1980
37.2 C (99.0 F)
33
Coldest night (TNn)
-15.0 C (5.0 F)
1985
-6.1 C (21.0 F)
33
Wettest day (Rx1day)
389.1 mm (15.3 in)
1991
109.7 mm (4.3 in)
33
Wettest five days (Rx5day)
429.5 mm (16.9 in)
1995
162.3 mm (6.4 in)
33
Longest dry spell (CDD)
70 days
2005
23 days
33
Hottest day (TXx)
The hottest day of the year at Bay St Louis Nasa, 1979 to 2011. The record is 40.0 C (104.0 F) in 1980, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Bay St Louis Nasa by year
Year
Hottest day (TXx)
1979
37.2 C (99.0 F)
1980
40.0 C (104.0 F)
1981
38.3 C (100.9 F)
1982
35.6 C (96.1 F)
1983
37.2 C (99.0 F)
1984
36.1 C (97.0 F)
1985
36.1 C (97.0 F)
1986
38.3 C (100.9 F)
1987
35.6 C (96.1 F)
1988
37.2 C (99.0 F)
1989
38.9 C (102.0 F)
1990
38.3 C (100.9 F)
1991
36.1 C (97.0 F)
1992
35.6 C (96.1 F)
1993
37.2 C (99.0 F)
1994
35.0 C (95.0 F)
1995
38.9 C (102.0 F)
1996
37.8 C (100.0 F)
1997
37.8 C (100.0 F)
1998
38.9 C (102.0 F)
1999
38.9 C (102.0 F)
2000
40.0 C (104.0 F)
2001
38.3 C (100.9 F)
2002
37.8 C (100.0 F)
2003
36.1 C (97.0 F)
2004
37.2 C (99.0 F)
2005
35.0 C (95.0 F)
2006
34.4 C (93.9 F)
2007
34.4 C (93.9 F)
2008
33.9 C (93.0 F)
2009
32.8 C (91.0 F)
2010
38.9 C (102.0 F)
2011
38.3 C (100.9 F)
Coldest night (TNn)
The coldest night of the year at Bay St Louis Nasa, 1979 to 2011. The record is -15.0 C (5.0 F) in 1985, marked on the chart; the median year is -6.1 C (21.0 F).
Coldest night (TNn) at Bay St Louis Nasa by year
Year
Coldest night (TNn)
1979
-7.8 C (18.0 F)
1980
-5.6 C (21.9 F)
1981
-8.9 C (16.0 F)
1982
-12.2 C (10.0 F)
1983
-11.1 C (12.0 F)
1984
-8.3 C (17.1 F)
1985
-15.0 C (5.0 F)
1986
-6.1 C (21.0 F)
1987
-5.0 C (23.0 F)
1988
-8.3 C (17.1 F)
1989
-12.2 C (10.0 F)
1990
-2.8 C (27.0 F)
1991
-6.7 C (19.9 F)
1992
-3.3 C (26.1 F)
1993
-5.6 C (21.9 F)
1994
-5.0 C (23.0 F)
1995
-5.6 C (21.9 F)
1996
-12.8 C (9.0 F)
1997
-7.2 C (19.0 F)
1998
-3.9 C (25.0 F)
1999
-7.8 C (18.0 F)
2000
-7.2 C (19.0 F)
2001
-7.2 C (19.0 F)
2002
-6.1 C (21.0 F)
2003
-7.2 C (19.0 F)
2004
-5.0 C (23.0 F)
2005
-2.2 C (28.0 F)
2006
-4.4 C (24.1 F)
2007
-5.0 C (23.0 F)
2008
-3.3 C (26.1 F)
2009
-5.6 C (21.9 F)
2010
-6.1 C (21.0 F)
2011
-6.7 C (19.9 F)
Wettest day (Rx1day)
The wettest day of the year at Bay St Louis Nasa, 1979 to 2011. The record is 389.1 mm (15.3 in) in 1991, marked on the chart; the median year is 109.7 mm (4.3 in).
Wettest day (Rx1day) at Bay St Louis Nasa by year
Year
Wettest day (Rx1day)
1979
87.1 mm (3.4 in)
1980
178.3 mm (7.0 in)
1981
103.9 mm (4.1 in)
1982
123.4 mm (4.9 in)
1983
106.7 mm (4.2 in)
1984
74.4 mm (2.9 in)
1985
102.1 mm (4.0 in)
1986
62.0 mm (2.4 in)
1987
126.0 mm (5.0 in)
1988
83.8 mm (3.3 in)
1989
126.0 mm (5.0 in)
1990
109.7 mm (4.3 in)
1991
389.1 mm (15.3 in)
1992
139.7 mm (5.5 in)
1993
129.8 mm (5.1 in)
1994
126.7 mm (5.0 in)
1995
300.0 mm (11.8 in)
1996
231.1 mm (9.1 in)
1997
128.8 mm (5.1 in)
1998
123.7 mm (4.9 in)
1999
88.9 mm (3.5 in)
2000
110.0 mm (4.3 in)
2001
125.5 mm (4.9 in)
2002
90.9 mm (3.6 in)
2003
102.4 mm (4.0 in)
2004
57.7 mm (2.3 in)
2005
58.7 mm (2.3 in)
2006
53.1 mm (2.1 in)
2007
180.3 mm (7.1 in)
2008
134.6 mm (5.3 in)
2009
52.1 mm (2.1 in)
2010
41.9 mm (1.6 in)
2011
57.2 mm (2.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Bay St Louis Nasa, 1979 to 2011. The record is 429.5 mm (16.9 in) in 1995, marked on the chart; the median year is 162.3 mm (6.4 in).
Wettest five days (Rx5day) at Bay St Louis Nasa by year
Year
Wettest five days (Rx5day)
1979
179.7 mm (7.1 in)
1980
384.6 mm (15.1 in)
1981
162.3 mm (6.4 in)
1982
161.7 mm (6.4 in)
1983
158.0 mm (6.2 in)
1984
109.4 mm (4.3 in)
1985
197.6 mm (7.8 in)
1986
122.2 mm (4.8 in)
1987
193.5 mm (7.6 in)
1988
160.8 mm (6.3 in)
1989
178.6 mm (7.0 in)
1990
140.4 mm (5.5 in)
1991
400.3 mm (15.8 in)
1992
173.3 mm (6.8 in)
1993
158.0 mm (6.2 in)
1994
140.5 mm (5.5 in)
1995
429.5 mm (16.9 in)
1996
240.0 mm (9.4 in)
1997
133.9 mm (5.3 in)
1998
211.8 mm (8.3 in)
1999
129.0 mm (5.1 in)
2000
191.2 mm (7.5 in)
2001
255.1 mm (10.0 in)
2002
177.1 mm (7.0 in)
2003
172.7 mm (6.8 in)
2004
143.8 mm (5.7 in)
2005
95.6 mm (3.8 in)
2006
91.7 mm (3.6 in)
2007
195.5 mm (7.7 in)
2008
197.1 mm (7.8 in)
2009
121.0 mm (4.8 in)
2010
30.3 mm (1.2 in)
2011
14.0 mm (0.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Bay St Louis Nasa, 1979 to 2011. The record is 70 days in 2005, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Bay St Louis Nasa by year
Year
Longest dry spell (CDD)
1979
31 days
1980
23 days
1981
39 days
1982
20 days
1983
16 days
1984
20 days
1985
16 days
1986
23 days
1987
20 days
1988
20 days
1989
31 days
1990
20 days
1991
20 days
1992
34 days
1993
17 days
1994
17 days
1995
13 days
1996
17 days
1997
20 days
1998
36 days
1999
34 days
2000
26 days
2001
38 days
2002
36 days
2003
25 days
2004
14 days
2005
70 days
2006
38 days
2007
28 days
2008
30 days
2009
23 days
2010
30 days
2011
5 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
22 years with a frost
Across 22 years with a frost, the median last spring frost at Bay St Louis Nasa falls on 13 March and the median first autumn frost on 18 November, which leaves a median of 252 days between them.
Frost dates and growing season at Bay St Louis Nasa
Measure
Median, all years
Earliest period
Recent period (1979 to 2006)
Recent against earliest
Fitted trend
Last spring frost
13 March
n/a
13 March
n/a
n/a
First autumn frost
18 November
n/a
18 November
n/a
n/a
Growing days
252 days
n/a
252 days
n/a
n/a
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.
Download the Data
Data for Bay St Louis Nasa standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Bay St Louis Nasa 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.