Mwanza Weather Records (TZ000063756)

Record envelope, standing records and threshold days for Mwanza (TZ000063756), Tanzania, with 76 years of record.

Key Facts for Mwanza

Mwanza (TZ000063756) is a weather station in Tanzania at -2.47 latitude and 32.92 longitude, 1,140 m (3,740 ft) above sea level.
The station reports from 1950 to 2025, 76 years of record.
1,464 records set at Mwanza still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Mwanza set a daily record precipitation of 21.8 mm (0.9 in) on 19 August 2025.

About the Station

Location: Tanzania, -2.47 latitude, 32.92 longitude.
Elevation: 1,140 m (3,740 ft).
Period of record: 1950 to 2025, 76 years.
Eligible elements: prcp.

Daily Record Envelope and 2026

14 days at or beyond a record

The band shows the record high and record low for each calendar day at Mwanza. The lines show the 2026 daily maximum and minimum. 14 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Mwanza, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	33.5 C (92.3 F)	11.7 C (53.1 F)	30.8 C (87.4 F)	16.2 C (61.2 F)
Feb	33.6 C (92.5 F)	11.9 C (53.4 F)	32.3 C (90.1 F)	16.4 C (61.5 F)
Mar	35.5 C (95.9 F)	12.0 C (53.6 F)	35.5 C (95.9 F)	17.9 C (64.2 F)
Apr	33.5 C (92.3 F)	15.0 C (59.0 F)	31.7 C (89.1 F)	17.7 C (63.9 F)
May	33.6 C (92.5 F)	11.5 C (52.7 F)	30.3 C (86.5 F)	17.8 C (64.0 F)
Jun	35.0 C (95.0 F)	9.7 C (49.5 F)	31.0 C (87.8 F)	11.6 C (52.9 F)
Jul	32.5 C (90.5 F)	7.8 C (46.0 F)	32.0 C (89.6 F)	10.9 C (51.6 F)
Aug	34.0 C (93.2 F)	10.0 C (50.0 F)	31.1 C (88.0 F)	13.4 C (56.1 F)
Sep	34.0 C (93.2 F)	11.0 C (51.8 F)	n/a	n/a
Oct	34.2 C (93.6 F)	12.0 C (53.6 F)	n/a	n/a
Nov	33.0 C (91.4 F)	12.6 C (54.7 F)	n/a	n/a
Dec	37.7 C (99.9 F)	13.3 C (55.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Mwanza still stand. 2019 holds the most, with 70.

Standing records at Mwanza by the year they were set
Year set	Standing records
1973	4
1974	5
1975	13
1976	11
1977	26
1978	23
1979	8
1980	9
1981	22
1982	8
1983	23
1984	18
1985	40
1986	41
1987	35
1988	45
1989	23
1990	15
1991	67
1992	28
1994	1
1997	2
1998	4
2000	11
2001	11
2002	17
2003	52
2004	28
2005	49
2006	30
2007	35
2008	52
2009	42
2010	31
2011	36
2012	33
2013	41
2014	48
2015	35
2016	50
2017	68
2018	45
2019	70
2020	26
2021	35
2022	37
2023	45
2024	43
2025	23

All-Time Record Progression

4 new records

4 all-time records were set at Mwanza between 18 June 1991 and 1 September 2013. Each dot is a new record.

When Mwanza set new all-time records
Date	Kind	Detail
1991-06-18	Record daily precipitation	Record daily precipitation 173.0 mm (6.8 in)
1992-05-15	Record daily precipitation	Record daily precipitation 174.0 mm (6.9 in)
1997-11-21	Record daily precipitation	Record daily precipitation 190.0 mm (7.5 in)
2013-09-01	Record daily precipitation	Record daily precipitation 279.9 mm (11.0 in)

Wettest Day of Each Month

Sep: 279.9 mm (11.0 in)

The wettest day on record for each calendar month at Mwanza. The most was 279.9 mm (11.0 in) on 1 September 2013.

Record daily precipitation for each month at Mwanza
Month	Record daily precipitation (mm)	Date
Jan	99.1 mm (3.9 in)	18 January 2023
Feb	146.1 mm (5.8 in)	12 February 1968
Mar	158.8 mm (6.3 in)	14 March 1975
Apr	150.9 mm (5.9 in)	5 April 1962
May	174.0 mm (6.9 in)	15 May 1992
Jun	173.0 mm (6.8 in)	18 June 1991
Jul	85.1 mm (3.4 in)	15 July 2023
Aug	152.1 mm (6.0 in)	30 August 2002
Sep	279.9 mm (11.0 in)	1 September 2013
Oct	130.0 mm (5.1 in)	5 October 2002
Nov	190.0 mm (7.5 in)	21 November 1997
Dec	129.6 mm (5.1 in)	17 December 1965

Period of Record Coverage

1973 to 2025

48 years of record at Mwanza, 1973 to 2025. 48 years have data for under 90 percent of days and are left out of rankings: 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980 and others.

Days with data per year at Mwanza
Year	Days with data	Share of year	Complete
1973	9	2%	No
1974	3	1%	No
1975	35	10%	No
1976	53	14%	No
1977	109	30%	No
1978	99	27%	No
1979	83	23%	No
1980	32	9%	No
1981	100	27%	No
1982	56	15%	No
1983	64	18%	No
1984	53	14%	No
1985	175	48%	No
1986	183	50%	No
1987	198	54%	No
1988	203	55%	No
1989	2	1%	No
1990	13	4%	No
1991	162	44%	No
1992	8	2%	No
1997	1	0%	No
1998	1	0%	No
2000	39	11%	No
2001	100	27%	No
2002	129	35%	No
2003	201	55%	No
2004	209	57%	No
2005	207	57%	No
2006	193	53%	No
2007	268	73%	No
2008	262	72%	No
2009	267	73%	No
2010	166	45%	No
2011	185	51%	No
2012	265	72%	No
2013	261	72%	No
2014	257	70%	No
2015	223	61%	No
2016	250	68%	No
2017	219	60%	No
2018	251	69%	No
2019	274	75%	No
2020	239	65%	No
2021	274	75%	No
2022	215	59%	No
2023	271	74%	No
2024	228	62%	No
2025	152	42%	No

Latest Records

Latest records at Mwanza
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
19 August 2025	Mwanza, TZ	daily rain	21.8 mm (0.9 in)	0.2 mm (0.01 in)	74 years	20 of 100 (Routine)
11 August 2025	Mwanza, TZ	daily rain	10.9 mm (0.4 in)	7.9 mm (0.31 in)	20 years	17 of 100 (Routine)
23 June 2025	Mwanza, TZ	daily rain	15.0 mm (0.6 in)	10.5 mm (0.4 in)	52 years	20 of 100 (Routine)
3 April 2025	Mwanza, TZ	daily rain	34.0 mm (1.3 in)	6.3 mm (0.25 in)	36 years	21 of 100 (Routine)
27 March 2025	Mwanza, TZ	daily rain	45.0 mm (1.8 in)	0.9 mm (0.04 in)	40 years	19 of 100 (Routine)
11 March 2024	Mwanza, TZ	daily rain	50.0 mm (2.0 in)	4.0 mm (0.16 in)	17 years	14 of 100 (Routine)
1 March 2024	Mwanza, TZ	daily rain	27.4 mm (1.1 in)	1.2 mm (0.05 in)	71 years	28 of 100 (Routine)
13 January 2024	Mwanza, TZ	daily rain	82.5 mm (3.2 in)	43.4 mm (1.7 in)	72 years	63 of 100 (Major)
27 December 2023	Mwanza, TZ	daily rain	30.0 mm (1.2 in)	19.8 mm (0.8 in)	72 years	41 of 100 (Notable)
25 November 2023	Mwanza, TZ	daily rain	50.3 mm (2.0 in)	16.6 mm (0.7 in)	33 years	27 of 100 (Routine)
11 September 2023	Mwanza, TZ	daily rain	24.9 mm (1.0 in)	5.9 mm (0.23 in)	41 years	20 of 100 (Routine)
8 September 2023	Mwanza, TZ	daily rain	33.0 mm (1.3 in)	25.9 mm (1.0 in)	0 years	18 of 100 (Routine)
7 September 2023	Mwanza, TZ	daily rain	39.1 mm (1.5 in)	16.0 mm (0.6 in)	0 years	14 of 100 (Routine)
15 July 2023	Mwanza, TZ	monthly rain	85.1 mm (3.4 in)	9.9 mm (0.39 in)	0 years	25 of 100 (Routine)
14 July 2023	Mwanza, TZ	monthly rain	75.2 mm (3.0 in)	23.6 mm (0.9 in)	72 years	59 of 100 (Notable)
14 June 2023	Mwanza, TZ	daily rain	21.6 mm (0.9 in)	13.5 mm (0.5 in)	60 years	20 of 100 (Routine)
24 April 2023	Mwanza, TZ	daily rain	57.2 mm (2.3 in)	7.7 mm (0.30 in)	70 years	33 of 100 (Routine)
31 March 2023	Mwanza, TZ	daily rain	53.6 mm (2.1 in)	12.6 mm (0.5 in)	48 years	29 of 100 (Routine)
16 March 2023	Mwanza, TZ	daily rain	57.9 mm (2.3 in)	32.3 mm (1.3 in)	44 years	41 of 100 (Notable)
18 January 2023	Mwanza, TZ	monthly rain	99.1 mm (3.9 in)	25.2 mm (1.0 in)	1 year	38 of 100 (Notable)

Extremes by Year

1950 to 2025

Yearly extremes at Mwanza: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.7 C (99.9 F)	2003	33.0 C (91.4 F)	48
Coldest night (TNn)	7.8 C (46.0 F)	2013	13.2 C (55.7 F)	52
Wettest day (Rx1day)	279.9 mm (11.0 in)	2013	68.3 mm (2.7 in)	76
Wettest five days (Rx5day)	227.9 mm (9.0 in)	2012	119.9 mm (4.7 in)	69
Longest dry spell (CDD)	136 days	1986	30 days	75

Hottest day (TXx)

The hottest day of the year at Mwanza, 1950 to 2025. The record is 37.7 C (99.9 F) in 2003, marked on the chart; the median year is 33.0 C (91.4 F).

Hottest day (TXx) at Mwanza by year
Year	Hottest day (TXx)
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	31.0 C (87.8 F)
1974	30.0 C (86.0 F)
1975	33.0 C (91.4 F)
1976	33.0 C (91.4 F)
1977	31.0 C (87.8 F)
1978	35.0 C (95.0 F)
1979	33.0 C (91.4 F)
1980	33.0 C (91.4 F)
1981	34.0 C (93.2 F)
1982	34.2 C (93.6 F)
1983	35.2 C (95.4 F)
1984	33.7 C (92.7 F)
1985	34.8 C (94.6 F)
1986	36.6 C (97.9 F)
1987	32.8 C (91.0 F)
1988	33.9 C (93.0 F)
1989	33.3 C (91.9 F)
1990	29.5 C (85.1 F)
1991	34.2 C (93.6 F)
1992	30.2 C (86.4 F)
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	33.0 C (91.4 F)
1998	32.0 C (89.6 F)
1999	n/a
2000	32.0 C (89.6 F)
2001	32.1 C (89.8 F)
2002	32.5 C (90.5 F)
2003	37.7 C (99.9 F)
2004	32.7 C (90.9 F)
2005	33.0 C (91.4 F)
2006	33.3 C (91.9 F)
2007	32.4 C (90.3 F)
2008	31.4 C (88.5 F)
2009	32.4 C (90.3 F)
2010	33.5 C (92.3 F)
2011	33.5 C (92.3 F)
2012	33.4 C (92.1 F)
2013	32.5 C (90.5 F)
2014	32.0 C (89.6 F)
2015	33.5 C (92.3 F)
2016	33.0 C (91.4 F)
2017	34.0 C (93.2 F)
2018	33.3 C (91.9 F)
2019	34.0 C (93.2 F)
2020	32.0 C (89.6 F)
2021	33.0 C (91.4 F)
2022	33.2 C (91.8 F)
2023	33.1 C (91.6 F)
2024	32.9 C (91.2 F)
2025	35.5 C (95.9 F)

Coldest night (TNn)

The coldest night of the year at Mwanza, 1950 to 2025. The record is 7.8 C (46.0 F) in 2013, marked on the chart; the median year is 13.2 C (55.7 F).

Coldest night (TNn) at Mwanza by year
Year	Coldest night (TNn)
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	15.0 C (59.0 F)
1974	11.0 C (51.8 F)
1975	12.0 C (53.6 F)
1976	14.0 C (57.2 F)
1977	12.0 C (53.6 F)
1978	14.0 C (57.2 F)
1979	13.0 C (55.4 F)
1980	15.0 C (59.0 F)
1981	14.0 C (57.2 F)
1982	13.6 C (56.5 F)
1983	15.0 C (59.0 F)
1984	11.6 C (52.9 F)
1985	10.5 C (50.9 F)
1986	12.0 C (53.6 F)
1987	12.5 C (54.5 F)
1988	12.2 C (54.0 F)
1989	12.0 C (53.6 F)
1990	10.5 C (50.9 F)
1991	11.0 C (51.8 F)
1992	11.0 C (51.8 F)
1993	n/a
1994	15.2 C (59.4 F)
1995	16.4 C (61.5 F)
1996	13.2 C (55.8 F)
1997	14.6 C (58.3 F)
1998	14.0 C (57.2 F)
1999	16.6 C (61.9 F)
2000	15.5 C (59.9 F)
2001	14.4 C (57.9 F)
2002	14.0 C (57.2 F)
2003	14.0 C (57.2 F)
2004	9.7 C (49.5 F)
2005	12.3 C (54.1 F)
2006	14.0 C (57.2 F)
2007	13.0 C (55.4 F)
2008	10.9 C (51.6 F)
2009	13.6 C (56.5 F)
2010	13.5 C (56.3 F)
2011	11.6 C (52.9 F)
2012	12.2 C (54.0 F)
2013	7.8 C (46.0 F)
2014	14.9 C (58.8 F)
2015	14.5 C (58.1 F)
2016	10.0 C (50.0 F)
2017	13.5 C (56.3 F)
2018	11.5 C (52.7 F)
2019	11.5 C (52.7 F)
2020	13.1 C (55.6 F)
2021	11.0 C (51.8 F)
2022	13.8 C (56.8 F)
2023	13.8 C (56.8 F)
2024	13.9 C (57.0 F)
2025	10.9 C (51.6 F)

Wettest day (Rx1day)

The wettest day of the year at Mwanza, 1950 to 2025. The record is 279.9 mm (11.0 in) in 2013, marked on the chart; the median year is 68.3 mm (2.7 in).

Wettest day (Rx1day) at Mwanza by year
Year	Wettest day (Rx1day)
1950	54.4 mm (2.1 in)
1951	111.8 mm (4.4 in)
1952	61.5 mm (2.4 in)
1953	45.7 mm (1.8 in)
1954	116.3 mm (4.6 in)
1955	98.6 mm (3.9 in)
1956	40.4 mm (1.6 in)
1957	54.9 mm (2.2 in)
1958	78.2 mm (3.1 in)
1959	65.5 mm (2.6 in)
1960	63.3 mm (2.5 in)
1961	118.1 mm (4.6 in)
1962	150.9 mm (5.9 in)
1963	56.2 mm (2.2 in)
1964	95.6 mm (3.8 in)
1965	129.6 mm (5.1 in)
1966	71.7 mm (2.8 in)
1967	50.6 mm (2.0 in)
1968	146.1 mm (5.8 in)
1969	98.1 mm (3.9 in)
1970	49.7 mm (2.0 in)
1971	46.6 mm (1.8 in)
1972	39.9 mm (1.6 in)
1973	79.0 mm (3.1 in)
1974	57.1 mm (2.2 in)
1975	158.8 mm (6.3 in)
1976	110.4 mm (4.3 in)
1977	49.1 mm (1.9 in)
1978	66.5 mm (2.6 in)
1979	69.6 mm (2.7 in)
1980	59.5 mm (2.3 in)
1981	59.5 mm (2.3 in)
1982	72.7 mm (2.9 in)
1983	62.6 mm (2.5 in)
1984	59.2 mm (2.3 in)
1985	60.8 mm (2.4 in)
1986	68.4 mm (2.7 in)
1987	96.8 mm (3.8 in)
1988	56.2 mm (2.2 in)
1989	86.9 mm (3.4 in)
1990	102.1 mm (4.0 in)
1991	173.0 mm (6.8 in)
1992	174.0 mm (6.9 in)
1993	4.1 mm (0.16 in)
1994	96.0 mm (3.8 in)
1995	51.1 mm (2.0 in)
1996	32.0 mm (1.3 in)
1997	190.0 mm (7.5 in)
1998	48.0 mm (1.9 in)
1999	13.0 mm (0.5 in)
2000	27.9 mm (1.1 in)
2001	40.9 mm (1.6 in)
2002	152.1 mm (6.0 in)
2003	89.9 mm (3.5 in)
2004	78.0 mm (3.1 in)
2005	117.1 mm (4.6 in)
2006	59.9 mm (2.4 in)
2007	70.1 mm (2.8 in)
2008	52.1 mm (2.1 in)
2009	64.0 mm (2.5 in)
2010	89.9 mm (3.5 in)
2011	65.0 mm (2.6 in)
2012	136.9 mm (5.4 in)
2013	279.9 mm (11.0 in)
2014	47.0 mm (1.9 in)
2015	94.0 mm (3.7 in)
2016	62.0 mm (2.4 in)
2017	73.9 mm (2.9 in)
2018	68.1 mm (2.7 in)
2019	93.0 mm (3.7 in)
2020	54.1 mm (2.1 in)
2021	64.0 mm (2.5 in)
2022	73.9 mm (2.9 in)
2023	99.1 mm (3.9 in)
2024	82.5 mm (3.2 in)
2025	45.0 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Mwanza, 1950 to 2025. The record is 227.9 mm (9.0 in) in 2012, marked on the chart; the median year is 119.9 mm (4.7 in).

Wettest five days (Rx5day) at Mwanza by year
Year	Wettest five days (Rx5day)
1950	93.1 mm (3.7 in)
1951	150.9 mm (5.9 in)
1952	103.9 mm (4.1 in)
1953	69.1 mm (2.7 in)
1954	176.0 mm (6.9 in)
1955	178.7 mm (7.0 in)
1956	84.3 mm (3.3 in)
1957	112.3 mm (4.4 in)
1958	132.3 mm (5.2 in)
1959	71.6 mm (2.8 in)
1960	115.9 mm (4.6 in)
1961	159.1 mm (6.3 in)
1962	218.0 mm (8.6 in)
1963	132.2 mm (5.2 in)
1964	137.0 mm (5.4 in)
1965	203.9 mm (8.0 in)
1966	117.1 mm (4.6 in)
1967	145.4 mm (5.7 in)
1968	154.4 mm (6.1 in)
1969	106.7 mm (4.2 in)
1970	86.1 mm (3.4 in)
1971	78.4 mm (3.1 in)
1972	118.8 mm (4.7 in)
1973	161.8 mm (6.4 in)
1974	153.0 mm (6.0 in)
1975	203.6 mm (8.0 in)
1976	118.0 mm (4.6 in)
1977	137.8 mm (5.4 in)
1978	119.8 mm (4.7 in)
1979	123.4 mm (4.9 in)
1980	99.1 mm (3.9 in)
1981	146.2 mm (5.8 in)
1982	99.9 mm (3.9 in)
1983	84.7 mm (3.3 in)
1984	64.9 mm (2.6 in)
1985	128.6 mm (5.1 in)
1986	120.2 mm (4.7 in)
1987	133.7 mm (5.3 in)
1988	133.6 mm (5.3 in)
1989	156.8 mm (6.2 in)
1990	56.4 mm (2.2 in)
1991	23.0 mm (0.9 in)
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	9.1 mm (0.36 in)
1997	202.0 mm (8.0 in)
1998	n/a
1999	n/a
2000	n/a
2001	24.7 mm (1.0 in)
2002	160.0 mm (6.3 in)
2003	115.0 mm (4.5 in)
2004	111.4 mm (4.4 in)
2005	127.0 mm (5.0 in)
2006	119.2 mm (4.7 in)
2007	119.9 mm (4.7 in)
2008	155.9 mm (6.1 in)
2009	130.1 mm (5.1 in)
2010	72.1 mm (2.8 in)
2011	94.0 mm (3.7 in)
2012	227.9 mm (9.0 in)
2013	132.5 mm (5.2 in)
2014	81.8 mm (3.2 in)
2015	139.9 mm (5.5 in)
2016	68.1 mm (2.7 in)
2017	113.0 mm (4.4 in)
2018	158.0 mm (6.2 in)
2019	125.7 mm (4.9 in)
2020	54.8 mm (2.2 in)
2021	149.1 mm (5.9 in)
2022	89.0 mm (3.5 in)
2023	145.2 mm (5.7 in)
2024	101.3 mm (4.0 in)
2025	79.5 mm (3.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Mwanza, 1950 to 2025. The record is 136 days in 1986, marked on the chart; the median year is 30 days.

Longest dry spell (CDD) at Mwanza by year
Year	Longest dry spell (CDD)
1950	38 days
1951	25 days
1952	72 days
1953	61 days
1954	54 days
1955	98 days
1956	74 days
1957	100 days
1958	33 days
1959	76 days
1960	88 days
1961	85 days
1962	41 days
1963	68 days
1964	47 days
1965	51 days
1966	69 days
1967	48 days
1968	89 days
1969	133 days
1970	51 days
1971	55 days
1972	61 days
1973	90 days
1974	52 days
1975	38 days
1976	30 days
1977	46 days
1978	42 days
1979	132 days
1980	100 days
1981	45 days
1982	46 days
1983	26 days
1984	71 days
1985	107 days
1986	136 days
1987	99 days
1988	33 days
1989	92 days
1990	3 days
1991	3 days
1992	3 days
1993	1 day
1994	3 days
1995	1 day
1996	2 days
1997	2 days
1998	2 days
1999	n/a
2000	2 days
2001	7 days
2002	6 days
2003	12 days
2004	13 days
2005	7 days
2006	3 days
2007	3 days
2008	5 days
2009	4 days
2010	3 days
2011	3 days
2012	2 days
2013	3 days
2014	5 days
2015	4 days
2016	5 days
2017	4 days
2018	5 days
2019	3 days
2020	3 days
2021	3 days
2022	4 days
2023	3 days
2024	4 days
2025	2 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

40 years, 1950 to 1989

A day with at least 69.6 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 206.2 mm (8.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Mwanza: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	69.6 mm (2.7 in)
5 years	96.7 mm (3.8 in)
10 years	117.9 mm (4.6 in)
25 years	149.1 mm (5.9 in)
50 years	176.0 mm (6.9 in)	Longer than the 40 years of record
100 years	206.2 mm (8.1 in)	Longer than the 40 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, 40 years of values from 1950 to 1989.

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: 158.8 mm (6.3 in) in 1975; 150.9 mm (5.9 in) in 1962; 146.1 mm (5.8 in) in 1968.

Download the Data

Data for Mwanza standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mwanza 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 2026-10-15 (15 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).