Ackerman Weather Records (USC00220039)

Record envelope, standing records and threshold days for Ackerman (USC00220039), Mississippi, United States, with 73 years of record.

Key Facts for Ackerman

Ackerman (USC00220039) is a weather station in Mississippi, United States at 33.31 latitude and -89.17 longitude, 167 m (549 ft) above sea level.
The station reports from 1940 to 2012, 73 years of record.
0 records set at Ackerman still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Ackerman set a daily record precipitation of 34.5 mm (1.4 in) on 17 April 2012.

About the Station

Location: Mississippi, United States, 33.31 latitude, -89.17 longitude.
Elevation: 167 m (549 ft).
Period of record: 1940 to 2012, 73 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 Ackerman. 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 Ackerman, 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	n/a	n/a	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

0 standing records

0 records at Ackerman still stand.

All-Time Record Progression

4 new records

4 all-time records were set at Ackerman between 16 March 1973 and 19 January 1992. Each dot is a new record.

When Ackerman set new all-time records
Date	Kind	Detail
1973-03-16	Record daily precipitation	Record daily precipitation 168.1 mm (6.6 in)
1977-09-07	Record daily precipitation	Record daily precipitation 222.5 mm (8.8 in)
1992-01-19	Record daily snowfall	Record daily snowfall 17.8 cm (7.0 in)
1992-01-19	Record snow depth	Record snow depth 17.8 cm (7.0 in)

Wettest Day of Each Month

Sep: 222.5 mm (8.8 in)

The wettest day on record for each calendar month at Ackerman. The most was 222.5 mm (8.8 in) on 7 September 1977.

Record daily precipitation for each month at Ackerman
Month	Record daily precipitation (mm)	Date
Jan	154.9 mm (6.1 in)	6 January 1950
Feb	106.7 mm (4.2 in)	1 February 1951
Mar	168.1 mm (6.6 in)	16 March 1973
Apr	122.9 mm (4.8 in)	12 April 1979
May	132.1 mm (5.2 in)	4 May 1944
Jun	164.8 mm (6.5 in)	2 June 1947
Jul	165.1 mm (6.5 in)	8 July 1968
Aug	135.6 mm (5.3 in)	30 August 2005
Sep	222.5 mm (8.8 in)	7 September 1977
Oct	185.9 mm (7.3 in)	17 October 2006
Nov	113.5 mm (4.5 in)	14 November 1957
Dec	160.0 mm (6.3 in)	4 December 1982

Latest Records

Latest records at Ackerman
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 April 2012	Ackerman, US	daily rain	34.5 mm (1.4 in)	4.0 mm (0.16 in)	30 years	17 of 100 (Routine)
22 March 2012	Ackerman, US	daily rain	91.4 mm (3.6 in)	37.8 mm (1.5 in)	57 years	43 of 100 (Notable)
27 November 2011	Ackerman, US	daily rain	48.3 mm (1.9 in)	17.8 mm (0.7 in)	62 years	35 of 100 (Notable)
20 September 2011	Ackerman, US	daily rain	30.5 mm (1.2 in)	5.4 mm (0.21 in)	2 years	9 of 100 (Routine)
5 September 2011	Ackerman, US	daily rain	147.1 mm (5.8 in)	101.6 mm (4.0 in)	61 years	65 of 100 (Major)
25 July 2011	Ackerman, US	daily rain	75.4 mm (3.0 in)	35.3 mm (1.4 in)	45 years	43 of 100 (Notable)
21 July 2011	Ackerman, US	daily rain	51.3 mm (2.0 in)	14.5 mm (0.6 in)	40 years	28 of 100 (Routine)
14 June 2011	Ackerman, US	daily rain	76.7 mm (3.0 in)	19.0 mm (0.7 in)	2 years	19 of 100 (Routine)
14 May 2011	Ackerman, US	daily rain	48.3 mm (1.9 in)	14.5 mm (0.6 in)	21 years	21 of 100 (Routine)
16 April 2011	Ackerman, US	daily rain	94.2 mm (3.7 in)	53.8 mm (2.1 in)	60 years	50 of 100 (Notable)
9 March 2011	Ackerman, US	daily rain	88.4 mm (3.5 in)	18.5 mm (0.7 in)	48 years	30 of 100 (Routine)
10 February 2011	Ackerman, US	monthly snow depth	10.2 cm (4.0 in)	7.7 cm (3.0 in)	50 years	39 of 100 (Notable)
10 February 2011	Ackerman, US	monthly snowfall (Tie)	10.2 cm (4.0 in)	tie	42 years	7 of 100 (Routine)
4 February 2011	Ackerman, US	daily snowfall	0.5 cm (0.2 in)	0.5 cm (0.2 in)	68 years	20 of 100 (Routine)
1 January 2011	Ackerman, US	daily rain	78.7 mm (3.1 in)	6.1 mm (0.24 in)	32 years	19 of 100 (Routine)
30 November 2010	Ackerman, US	daily rain	54.4 mm (2.1 in)	16.3 mm (0.6 in)	32 years	26 of 100 (Routine)
3 November 2010	Ackerman, US	daily rain	49.5 mm (1.9 in)	12.7 mm (0.5 in)	32 years	23 of 100 (Routine)
24 April 2010	Ackerman, US	daily rain	41.9 mm (1.6 in)	15.2 mm (0.6 in)	24 years	21 of 100 (Routine)
10 March 2010	Ackerman, US	daily rain	34.3 mm (1.4 in)	2.5 mm (0.10 in)	16 years	12 of 100 (Routine)
24 September 2009	Ackerman, US	daily rain	33.3 mm (1.3 in)	1.8 mm (0.07 in)	44 years	20 of 100 (Routine)

Extremes by Year

1940 to 2012

Yearly extremes at Ackerman: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	222.5 mm (8.8 in)	1977	81.3 mm (3.2 in)	73
Wettest five days (Rx5day)	261.6 mm (10.3 in)	2006	135.9 mm (5.4 in)	73
Longest dry spell (CDD)	37 days	1987	20 days	73

Wettest day (Rx1day)

The wettest day of the year at Ackerman, 1940 to 2012. The record is 222.5 mm (8.8 in) in 1977, marked on the chart; the median year is 81.3 mm (3.2 in).

Wettest day (Rx1day) at Ackerman by year
Year	Wettest day (Rx1day)
1940	57.4 mm (2.3 in)
1941	57.4 mm (2.3 in)
1942	84.3 mm (3.3 in)
1943	49.0 mm (1.9 in)
1944	132.1 mm (5.2 in)
1945	69.3 mm (2.7 in)
1946	81.5 mm (3.2 in)
1947	164.8 mm (6.5 in)
1948	71.9 mm (2.8 in)
1949	78.5 mm (3.1 in)
1950	154.9 mm (6.1 in)
1951	152.4 mm (6.0 in)
1952	61.0 mm (2.4 in)
1953	81.3 mm (3.2 in)
1954	63.8 mm (2.5 in)
1955	71.9 mm (2.8 in)
1956	80.3 mm (3.2 in)
1957	113.5 mm (4.5 in)
1958	83.8 mm (3.3 in)
1959	67.6 mm (2.7 in)
1960	59.9 mm (2.4 in)
1961	152.4 mm (6.0 in)
1962	69.9 mm (2.8 in)
1963	67.3 mm (2.6 in)
1964	86.4 mm (3.4 in)
1965	71.4 mm (2.8 in)
1966	67.1 mm (2.6 in)
1967	152.4 mm (6.0 in)
1968	165.1 mm (6.5 in)
1969	108.0 mm (4.3 in)
1970	96.5 mm (3.8 in)
1971	76.2 mm (3.0 in)
1972	72.6 mm (2.9 in)
1973	168.1 mm (6.6 in)
1974	66.3 mm (2.6 in)
1975	125.2 mm (4.9 in)
1976	66.5 mm (2.6 in)
1977	222.5 mm (8.8 in)
1978	94.0 mm (3.7 in)
1979	122.9 mm (4.8 in)
1980	100.1 mm (3.9 in)
1981	58.4 mm (2.3 in)
1982	160.0 mm (6.3 in)
1983	120.9 mm (4.8 in)
1984	67.1 mm (2.6 in)
1985	55.9 mm (2.2 in)
1986	50.8 mm (2.0 in)
1987	45.7 mm (1.8 in)
1988	68.6 mm (2.7 in)
1989	81.8 mm (3.2 in)
1990	81.3 mm (3.2 in)
1991	102.9 mm (4.1 in)
1992	68.6 mm (2.7 in)
1993	57.4 mm (2.3 in)
1994	104.1 mm (4.1 in)
1995	83.3 mm (3.3 in)
1996	51.1 mm (2.0 in)
1997	145.5 mm (5.7 in)
1998	53.8 mm (2.1 in)
1999	79.5 mm (3.1 in)
2000	76.7 mm (3.0 in)
2001	116.8 mm (4.6 in)
2002	126.0 mm (5.0 in)
2003	94.0 mm (3.7 in)
2004	66.5 mm (2.6 in)
2005	135.6 mm (5.3 in)
2006	185.9 mm (7.3 in)
2007	85.3 mm (3.4 in)
2008	69.9 mm (2.8 in)
2009	97.8 mm (3.9 in)
2010	58.9 mm (2.3 in)
2011	147.1 mm (5.8 in)
2012	91.4 mm (3.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ackerman, 1940 to 2012. The record is 261.6 mm (10.3 in) in 2006, marked on the chart; the median year is 135.9 mm (5.4 in).

Wettest five days (Rx5day) at Ackerman by year
Year	Wettest five days (Rx5day)
1940	134.3 mm (5.3 in)
1941	108.7 mm (4.3 in)
1942	89.1 mm (3.5 in)
1943	84.8 mm (3.3 in)
1944	200.2 mm (7.9 in)
1945	108.2 mm (4.3 in)
1946	171.2 mm (6.7 in)
1947	96.7 mm (3.8 in)
1948	140.7 mm (5.5 in)
1949	183.4 mm (7.2 in)
1950	221.2 mm (8.7 in)
1951	208.3 mm (8.2 in)
1952	64.6 mm (2.5 in)
1953	117.4 mm (4.6 in)
1954	138.2 mm (5.4 in)
1955	114.8 mm (4.5 in)
1956	142.0 mm (5.6 in)
1957	125.0 mm (4.9 in)
1958	147.8 mm (5.8 in)
1959	135.9 mm (5.4 in)
1960	95.9 mm (3.8 in)
1961	174.3 mm (6.9 in)
1962	107.2 mm (4.2 in)
1963	140.9 mm (5.5 in)
1964	107.2 mm (4.2 in)
1965	171.8 mm (6.8 in)
1966	118.5 mm (4.7 in)
1967	203.5 mm (8.0 in)
1968	180.6 mm (7.1 in)
1969	178.3 mm (7.0 in)
1970	172.7 mm (6.8 in)
1971	134.8 mm (5.3 in)
1972	128.2 mm (5.0 in)
1973	177.8 mm (7.0 in)
1974	141.4 mm (5.6 in)
1975	191.2 mm (7.5 in)
1976	138.7 mm (5.5 in)
1977	240.8 mm (9.5 in)
1978	194.6 mm (7.7 in)
1979	251.1 mm (9.9 in)
1980	147.4 mm (5.8 in)
1981	91.9 mm (3.6 in)
1982	220.2 mm (8.7 in)
1983	200.4 mm (7.9 in)
1984	109.3 mm (4.3 in)
1985	119.4 mm (4.7 in)
1986	90.8 mm (3.6 in)
1987	75.1 mm (3.0 in)
1988	68.6 mm (2.7 in)
1989	139.7 mm (5.5 in)
1990	87.6 mm (3.4 in)
1991	184.0 mm (7.2 in)
1992	103.4 mm (4.1 in)
1993	116.1 mm (4.6 in)
1994	108.7 mm (4.3 in)
1995	186.0 mm (7.3 in)
1996	94.6 mm (3.7 in)
1997	158.2 mm (6.2 in)
1998	118.3 mm (4.7 in)
1999	131.8 mm (5.2 in)
2000	181.6 mm (7.1 in)
2001	133.8 mm (5.3 in)
2002	223.3 mm (8.8 in)
2003	126.0 mm (5.0 in)
2004	130.0 mm (5.1 in)
2005	135.6 mm (5.3 in)
2006	261.6 mm (10.3 in)
2007	130.0 mm (5.1 in)
2008	169.9 mm (6.7 in)
2009	149.4 mm (5.9 in)
2010	72.2 mm (2.8 in)
2011	163.1 mm (6.4 in)
2012	106.6 mm (4.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ackerman, 1940 to 2012. The record is 37 days in 1987, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Ackerman by year
Year	Longest dry spell (CDD)
1940	24 days
1941	16 days
1942	17 days
1943	22 days
1944	25 days
1945	17 days
1946	18 days
1947	22 days
1948	32 days
1949	20 days
1950	16 days
1951	27 days
1952	30 days
1953	25 days
1954	14 days
1955	27 days
1956	24 days
1957	16 days
1958	17 days
1959	13 days
1960	17 days
1961	24 days
1962	27 days
1963	34 days
1964	24 days
1965	29 days
1966	24 days
1967	20 days
1968	18 days
1969	20 days
1970	19 days
1971	18 days
1972	17 days
1973	15 days
1974	17 days
1975	12 days
1976	24 days
1977	23 days
1978	33 days
1979	12 days
1980	35 days
1981	21 days
1982	20 days
1983	21 days
1984	32 days
1985	16 days
1986	18 days
1987	37 days
1988	36 days
1989	30 days
1990	18 days
1991	17 days
1992	21 days
1993	25 days
1994	17 days
1995	23 days
1996	19 days
1997	17 days
1998	25 days
1999	21 days
2000	28 days
2001	12 days
2002	21 days
2003	14 days
2004	21 days
2005	35 days
2006	21 days
2007	19 days
2008	17 days
2009	12 days
2010	17 days
2011	16 days
2012	18 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

64 years, 1940 to 2011

A day with at least 82.9 mm (3.3 in) of rain is expected about once in 2 years. A day with at least 248.9 mm (9.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Ackerman: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	82.9 mm (3.3 in)
5 years	115.7 mm (4.6 in)
10 years	141.5 mm (5.6 in)
25 years	179.4 mm (7.1 in)
50 years	212.1 mm (8.4 in)
100 years	248.9 mm (9.8 in)	Longer than the 64 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, 64 years of values from 1940 to 2011.

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: 222.5 mm (8.8 in) in 1977; 168.1 mm (6.6 in) in 1973; 165.1 mm (6.5 in) in 1968.

Download the Data

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

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

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	n/a	n/a	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

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	n/a	n/a	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