Bilma Weather Records (NG000061017)

Record envelope, standing records and threshold days for Bilma (NG000061017), Niger, with 88 years of record.

Key Facts for Bilma

Bilma (NG000061017) is a weather station in Niger at 18.68 latitude and 12.92 longitude, 357 m (1,171 ft) above sea level.
The station reports from 1938 to 2025, 88 years of record.
1,464 records set at Bilma still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Bilma set a daily record high minimum temperature of 29.4 C (84.9 F) on 21 August 2025.

About the Station

Location: Niger, 18.68 latitude, 12.92 longitude.
Elevation: 357 m (1,171 ft).
Period of record: 1938 to 2025, 88 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

8 days at or beyond a record

The band shows the record high and record low for each calendar day at Bilma. The lines show the 2026 daily maximum and minimum. 8 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Bilma, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	37.4 C (99.3 F)	-2.4 C (27.7 F)	33.6 C (92.5 F)	5.0 C (41.0 F)
Feb	41.8 C (107.2 F)	0.0 C (32.0 F)	35.4 C (95.7 F)	6.0 C (42.8 F)
Mar	43.3 C (109.9 F)	1.0 C (33.8 F)	41.8 C (107.2 F)	9.3 C (48.7 F)
Apr	47.0 C (116.6 F)	6.4 C (43.5 F)	42.9 C (109.2 F)	7.4 C (45.3 F)
May	48.0 C (118.4 F)	7.4 C (45.3 F)	47.2 C (117.0 F)	14.0 C (57.2 F)
Jun	49.0 C (120.2 F)	13.9 C (57.0 F)	45.6 C (114.1 F)	20.2 C (68.4 F)
Jul	47.0 C (116.6 F)	13.2 C (55.8 F)	45.4 C (113.7 F)	20.4 C (68.7 F)
Aug	47.4 C (117.3 F)	16.5 C (61.7 F)	44.2 C (111.6 F)	22.0 C (71.6 F)
Sep	46.4 C (115.5 F)	12.1 C (53.8 F)	n/a	n/a
Oct	44.0 C (111.2 F)	6.6 C (43.9 F)	n/a	n/a
Nov	41.4 C (106.5 F)	1.3 C (34.3 F)	n/a	n/a
Dec	37.5 C (99.5 F)	-1.0 C (30.2 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Bilma still stand. 1944 holds the most, with 113.

Standing records at Bilma by the year they were set
Year set	Standing records
1938	20
1939	21
1940	17
1941	19
1942	40
1943	45
1944	113
1945	13
1946	6
1947	15
1948	36
1949	12
1950	12
1951	9
1952	12
1953	19
1954	10
1955	10
1956	14
1957	16
1958	11
1959	6
1960	11
1961	18
1962	26
1963	15
1964	16
1965	14
1966	8
1967	9
1968	12
1969	15
1970	15
1971	14
1972	7
1973	14
1974	12
1975	7
1976	20
1977	15
1978	22
1979	14
1980	18
1981	13
1982	7
1983	16
1984	5
1985	16
1986	15
1987	20
1988	12
1989	5
1990	20
1991	1
1992	19
1993	18
1994	3
1995	13
1996	3
1997	7
1998	5
1999	3
2000	10
2001	8
2002	8
2003	18
2004	20
2005	14
2006	1
2007	2
2008	1
2009	14
2010	48
2011	19
2012	16
2013	17
2014	11
2015	23
2016	30
2017	31
2018	19
2019	33
2020	26
2021	19
2022	14
2023	28
2024	44
2025	11

All-Time Record Progression

12 new records

12 all-time records were set at Bilma between 8 June 1980 and 17 June 2018. Each dot is a new record.

When Bilma set new all-time records
Date	Kind	Detail
1980-06-08	Record high minimum temperature	Record high minimum temperature 32.8 C (91.0 F)
1982-07-11	Record daily precipitation	Record daily precipitation 102.1 mm (4.0 in)
1986-12-22	Record low minimum temperature	Record low minimum temperature -1.0 C (30.2 F)
1993-01-06	Record low maximum temperature	Record low maximum temperature 15.0 C (59.0 F)
1995-01-13	Record low minimum temperature	Record low minimum temperature -2.4 C (27.7 F)
1995-06-23	Record high minimum temperature	Record high minimum temperature 33.2 C (91.8 F)
2004-06-21	Record high minimum temperature	Record high minimum temperature 33.5 C (92.3 F)
2005-06-23	Record high minimum temperature	Record high minimum temperature 33.8 C (92.8 F)
2010-06-23	Record high maximum temperature	Record high maximum temperature 48.2 C (118.8 F)
2016-06-08	Record high maximum temperature	Record high maximum temperature 49.0 C (120.2 F)
2017-06-13	Record high minimum temperature	Record high minimum temperature 34.0 C (93.2 F)
2018-06-17	Record high minimum temperature	Record high minimum temperature 35.0 C (95.0 F)

Wettest Day of Each Month

Jan: 102.1 mm (4.0 in)

The wettest day on record for each calendar month at Bilma. The most was 102.1 mm (4.0 in) on 6 January 1994.

Record daily precipitation for each month at Bilma
Month	Record daily precipitation (mm)	Date
Jan	102.1 mm (4.0 in)	6 January 1994
Feb	3.2 mm (0.13 in)	17 February 1954
Mar	102.1 mm (4.0 in)	18 March 2016
Apr	8.9 mm (0.35 in)	23 April 1995
May	12.4 mm (0.5 in)	5 May 1955
Jun	23.6 mm (0.9 in)	16 June 1976
Jul	102.1 mm (4.0 in)	11 July 1982
Aug	64.5 mm (2.5 in)	10 August 2025
Sep	102.1 mm (4.0 in)	28 September 1993
Oct	4.7 mm (0.19 in)	18 October 1963
Nov	102.1 mm (4.0 in)	12 November 1983
Dec	102.1 mm (4.0 in)	22 December 1986

Period of Record Coverage

1938 to 2025

88 years of record at Bilma, 1938 to 2025. 39 years have data for under 90 percent of days and are left out of rankings: 1938, 1945, 1946, 1949, 1981, 1982, 1983, 1984 and others.

Days with data per year at Bilma
Year	Days with data	Share of year	Complete
1938	121	33%	No
1939	362	99%	Yes
1940	365	100%	Yes
1941	330	90%	Yes
1942	361	99%	Yes
1943	345	95%	Yes
1944	366	100%	Yes
1945	234	64%	No
1946	161	44%	No
1947	365	100%	Yes
1948	366	100%	Yes
1949	317	87%	No
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	361	99%	Yes
1955	365	100%	Yes
1956	364	99%	Yes
1957	365	100%	Yes
1958	363	99%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	364	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	340	93%	Yes
1976	361	99%	Yes
1977	365	100%	Yes
1978	364	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	167	46%	No
1982	192	53%	No
1983	254	70%	No
1984	67	18%	No
1985	306	84%	No
1986	287	79%	No
1987	305	84%	No
1988	193	53%	No
1989	133	36%	No
1990	277	76%	No
1991	36	10%	No
1992	250	68%	No
1993	313	86%	No
1994	64	18%	No
1995	313	86%	No
1996	122	33%	No
1997	66	18%	No
1998	3	1%	No
1999	62	17%	No
2000	275	75%	No
2001	255	70%	No
2002	251	69%	No
2003	282	77%	No
2004	262	72%	No
2005	173	47%	No
2006	166	45%	No
2007	39	11%	No
2008	1	0%	No
2009	70	19%	No
2010	318	87%	No
2011	334	92%	Yes
2012	356	97%	Yes
2013	352	96%	Yes
2014	325	89%	No
2015	312	85%	No
2016	357	98%	Yes
2017	355	97%	Yes
2018	355	97%	Yes
2019	350	96%	Yes
2020	357	98%	Yes
2021	314	86%	No
2022	338	93%	Yes
2023	334	92%	Yes
2024	284	78%	No
2025	220	60%	No

Latest Records

Latest records at Bilma
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 August 2025	Bilma, NE	daily high min	29.4 C (84.9 F)	0.2 C (0.4 F)	0 years	8 of 100 (Routine)
10 August 2025	Bilma, NE	monthly rain	64.5 mm (2.5 in)	17.1 mm (0.7 in)	75 years	63 of 100 (Major)
2 August 2025	Bilma, NE	daily rain	5.1 mm (0.20 in)	3.3 mm (0.13 in)	67 years	20 of 100 (Routine)
25 July 2025	Bilma, NE	daily high max (Tie)	45.0 C (113.0 F)	tie	86 years	8 of 100 (Routine)
12 July 2025	Bilma, NE	daily low max	39.0 C (102.2 F)	0.6 C (1.1 F)	4 years	12 of 100 (Routine)
27 June 2025	Bilma, NE	daily high min (Tie)	30.9 C (87.6 F)	tie	64 years	6 of 100 (Routine)
3 June 2025	Bilma, NE	daily low max	35.9 C (96.6 F)	1.3 C (2.3 F)	38 years	26 of 100 (Routine)
27 May 2025	Bilma, NE	daily high min (Tie)	30.7 C (87.3 F)	tie	43 years	5 of 100 (Routine)
25 May 2025	Bilma, NE	daily high max	47.2 C (117.0 F)	0.6 C (1.1 F)	2 years	10 of 100 (Routine)
15 May 2025	Bilma, NE	daily high max	46.9 C (116.4 F)	0.9 C (1.6 F)	2 years	11 of 100 (Routine)
14 May 2025	Bilma, NE	daily high max	46.8 C (116.2 F)	1.8 C (3.2 F)	74 years	37 of 100 (Notable)
13 May 2025	Bilma, NE	daily high max (Tie)	46.1 C (115.0 F)	tie	4 years	2 of 100 (Routine)
3 April 2025	Bilma, NE	daily low min	8.2 C (46.8 F)	0.3 C (0.5 F)	2 years	8 of 100 (Routine)
2 April 2025	Bilma, NE	daily low min	7.4 C (45.3 F)	1.0 C (1.8 F)	2 years	10 of 100 (Routine)
20 March 2025	Bilma, NE	daily high max	41.8 C (107.2 F)	0.6 C (1.1 F)	86 years	34 of 100 (Routine)
21 January 2025	Bilma, NE	daily high min	17.8 C (64.0 F)	1.3 C (2.3 F)	22 years	17 of 100 (Routine)
18 January 2025	Bilma, NE	daily high min	17.3 C (63.1 F)	0.8 C (1.4 F)	24 years	16 of 100 (Routine)
7 October 2024	Bilma, NE	daily high max	42.8 C (109.0 F)	0.2 C (0.4 F)	4 years	9 of 100 (Routine)
3 October 2024	Bilma, NE	daily high min	28.3 C (82.9 F)	0.9 C (1.6 F)	9 years	12 of 100 (Routine)
29 September 2024	Bilma, NE	daily high min	30.3 C (86.5 F)	0.9 C (1.6 F)	3 years	10 of 100 (Routine)

Climate Trend

46 complete years, 1939 to 2023

One stripe for each of 46 complete years at Bilma, 1939 to 2023. Blue stripes are years cooler than the station's own mean of 27.1 C (80.8 F); red stripes are warmer. The coolest year was 1977, at 25.8 C (78.4 F), and the warmest was 2016, at 28.3 C (83.0 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at Bilma as warming stripes, 1939 to 2023
Year	Annual mean temperature	Difference from the station mean
1939	27.3 C	+0.18 C
1940	27.2 C	+0.12 C
1947	27.3 C	+0.17 C
1948	26.4 C	-0.72 C
1950	26.2 C	-0.94 C
1951	27.4 C	+0.24 C
1952	26.9 C	-0.27 C
1953	27.0 C	-0.08 C
1954	27.0 C	-0.15 C
1955	26.7 C	-0.38 C
1956	26.6 C	-0.55 C
1957	27.2 C	+0.04 C
1958	27.2 C	+0.12 C
1959	26.7 C	-0.42 C
1960	27.0 C	-0.08 C
1961	25.8 C	-1.28 C
1962	27.6 C	+0.48 C
1963	27.4 C	+0.29 C
1964	26.7 C	-0.47 C
1966	26.6 C	-0.54 C
1967	26.7 C	-0.46 C
1968	26.6 C	-0.57 C
1969	27.9 C	+0.80 C
1970	26.3 C	-0.78 C
1971	26.6 C	-0.50 C
1972	26.9 C	-0.19 C
1973	26.8 C	-0.30 C
1974	26.3 C	-0.78 C
1976	27.2 C	+0.05 C
1977	25.8 C	-1.37 C
1978	27.2 C	+0.03 C
1979	27.5 C	+0.37 C
1980	27.1 C	-0.01 C
1995	27.0 C	-0.08 C
2011	28.0 C	+0.83 C
2012	28.1 C	+1.00 C
2013	27.7 C	+0.57 C
2014	27.7 C	+0.60 C
2015	27.2 C	+0.03 C
2016	28.3 C	+1.19 C
2017	27.5 C	+0.37 C
2018	28.1 C	+0.93 C
2019	27.9 C	+0.80 C
2020	27.7 C	+0.56 C
2022	27.1 C	-0.05 C
2023	28.2 C	+1.04 C

The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1939 to 2023. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 46 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Bilma
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (0.1 to 0.2) per decade	0.2 F (0.1 to 0.3) per decade	1939 to 2023	46	Rise
Mean daily maximum	0.2 C (0.1 to 0.3) per decade	0.3 F (0.2 to 0.5) per decade	1939 to 2023	46	Rise
Mean daily minimum	0.07 C (0.01 to 0.14) per decade	0.13 F (0.02 to 0.25) per decade	1939 to 2023	46	Rise

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

1938 to 2025

Yearly extremes at Bilma: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	49.0 C (120.2 F)	2016	45.6 C (114.1 F)	88
Coldest night (TNn)	-2.4 C (27.7 F)	1995	1.4 C (34.5 F)	88
Wettest day (Rx1day)	102.1 mm (4.0 in)	1982	5.9 mm (0.23 in)	74
Wettest five days (Rx5day)	64.5 mm (2.5 in)	2025	6.9 mm (0.27 in)	41
Longest dry spell (CDD)	365 days	1973	31 days	73

Hottest day (TXx)

The hottest day of the year at Bilma, 1938 to 2025. The record is 49.0 C (120.2 F) in 2016, marked on the chart; the median year is 45.6 C (114.1 F).

Hottest day (TXx) at Bilma by year
Year	Hottest day (TXx)
1938	44.5 C (112.1 F)
1939	48.0 C (118.4 F)
1940	47.2 C (117.0 F)
1941	46.6 C (115.9 F)
1942	47.3 C (117.1 F)
1943	44.4 C (111.9 F)
1944	46.9 C (116.4 F)
1945	45.8 C (114.4 F)
1946	43.0 C (109.4 F)
1947	45.5 C (113.9 F)
1948	46.2 C (115.2 F)
1949	46.0 C (114.8 F)
1950	44.4 C (111.9 F)
1951	45.6 C (114.1 F)
1952	45.6 C (114.1 F)
1953	45.5 C (113.9 F)
1954	44.6 C (112.3 F)
1955	44.3 C (111.7 F)
1956	43.5 C (110.3 F)
1957	44.9 C (112.8 F)
1958	44.6 C (112.3 F)
1959	45.2 C (113.4 F)
1960	44.8 C (112.6 F)
1961	46.4 C (115.5 F)
1962	46.6 C (115.9 F)
1963	45.0 C (113.0 F)
1964	45.2 C (113.4 F)
1965	45.2 C (113.4 F)
1966	45.2 C (113.4 F)
1967	44.2 C (111.6 F)
1968	43.9 C (111.0 F)
1969	45.1 C (113.2 F)
1970	45.2 C (113.4 F)
1971	46.0 C (114.8 F)
1972	44.4 C (111.9 F)
1973	45.0 C (113.0 F)
1974	45.2 C (113.4 F)
1975	45.2 C (113.4 F)
1976	45.0 C (113.0 F)
1977	45.7 C (114.3 F)
1978	46.0 C (114.8 F)
1979	46.3 C (115.3 F)
1980	46.0 C (114.8 F)
1981	47.0 C (116.6 F)
1982	46.4 C (115.5 F)
1983	45.0 C (113.0 F)
1984	35.2 C (95.4 F)
1985	45.5 C (113.9 F)
1986	44.4 C (111.9 F)
1987	46.1 C (115.0 F)
1988	43.8 C (110.8 F)
1989	44.1 C (111.4 F)
1990	45.6 C (114.1 F)
1991	43.4 C (110.1 F)
1992	46.5 C (115.7 F)
1993	45.4 C (113.7 F)
1994	36.0 C (96.8 F)
1995	46.5 C (115.7 F)
1996	43.0 C (109.4 F)
1997	43.0 C (109.4 F)
1998	47.1 C (116.8 F)
1999	42.6 C (108.7 F)
2000	45.6 C (114.1 F)
2001	46.0 C (114.8 F)
2002	45.7 C (114.3 F)
2003	46.0 C (114.8 F)
2004	47.0 C (116.6 F)
2005	45.6 C (114.1 F)
2006	46.0 C (114.8 F)
2007	45.0 C (113.0 F)
2008	36.5 C (97.7 F)
2009	44.2 C (111.6 F)
2010	48.2 C (118.8 F)
2011	47.0 C (116.6 F)
2012	46.3 C (115.3 F)
2013	46.5 C (115.7 F)
2014	46.5 C (115.7 F)
2015	46.7 C (116.1 F)
2016	49.0 C (120.2 F)
2017	47.0 C (116.6 F)
2018	47.8 C (118.0 F)
2019	46.8 C (116.2 F)
2020	48.1 C (118.6 F)
2021	46.6 C (115.9 F)
2022	46.4 C (115.5 F)
2023	47.4 C (117.3 F)
2024	48.4 C (119.1 F)
2025	47.2 C (117.0 F)

Coldest night (TNn)

The coldest night of the year at Bilma, 1938 to 2025. The record is -2.4 C (27.7 F) in 1995, marked on the chart; the median year is 1.4 C (34.5 F).

Coldest night (TNn) at Bilma by year
Year	Coldest night (TNn)
1938	1.2 C (34.2 F)
1939	1.2 C (34.2 F)
1940	1.0 C (33.8 F)
1941	1.0 C (33.8 F)
1942	2.9 C (37.2 F)
1943	0.5 C (32.9 F)
1944	0.0 C (32.0 F)
1945	1.0 C (33.8 F)
1946	3.3 C (37.9 F)
1947	1.8 C (35.2 F)
1948	0.5 C (32.9 F)
1949	0.1 C (32.2 F)
1950	4.8 C (40.6 F)
1951	2.2 C (36.0 F)
1952	2.2 C (36.0 F)
1953	1.2 C (34.2 F)
1954	2.5 C (36.5 F)
1955	3.0 C (37.4 F)
1956	2.1 C (35.8 F)
1957	1.2 C (34.2 F)
1958	3.8 C (38.8 F)
1959	1.1 C (34.0 F)
1960	0.9 C (33.6 F)
1961	0.0 C (32.0 F)
1962	2.6 C (36.7 F)
1963	2.4 C (36.3 F)
1964	2.6 C (36.7 F)
1965	3.0 C (37.4 F)
1966	1.3 C (34.3 F)
1967	0.8 C (33.4 F)
1968	2.1 C (35.8 F)
1969	4.0 C (39.2 F)
1970	3.8 C (38.8 F)
1971	1.0 C (33.8 F)
1972	3.6 C (38.5 F)
1973	2.2 C (36.0 F)
1974	2.8 C (37.0 F)
1975	1.0 C (33.8 F)
1976	0.4 C (32.7 F)
1977	0.3 C (32.5 F)
1978	1.4 C (34.5 F)
1979	2.2 C (36.0 F)
1980	1.6 C (34.9 F)
1981	0.0 C (32.0 F)
1982	4.5 C (40.1 F)
1983	1.7 C (35.1 F)
1984	1.5 C (34.7 F)
1985	3.0 C (37.4 F)
1986	-1.0 C (30.2 F)
1987	-0.4 C (31.3 F)
1988	1.3 C (34.3 F)
1989	0.8 C (33.4 F)
1990	3.4 C (38.1 F)
1991	1.9 C (35.4 F)
1992	1.4 C (34.5 F)
1993	0.3 C (32.5 F)
1994	1.2 C (34.2 F)
1995	-2.4 C (27.7 F)
1996	2.8 C (37.0 F)
1997	1.0 C (33.8 F)
1998	1.9 C (35.4 F)
1999	-0.5 C (31.1 F)
2000	1.0 C (33.8 F)
2001	1.0 C (33.8 F)
2002	1.0 C (33.8 F)
2003	-0.5 C (31.1 F)
2004	1.0 C (33.8 F)
2005	1.2 C (34.2 F)
2006	2.0 C (35.6 F)
2007	0.7 C (33.3 F)
2008	13.0 C (55.4 F)
2009	4.5 C (40.1 F)
2010	2.4 C (36.3 F)
2011	1.0 C (33.8 F)
2012	-0.3 C (31.5 F)
2013	1.7 C (35.1 F)
2014	1.5 C (34.7 F)
2015	0.2 C (32.4 F)
2016	1.5 C (34.7 F)
2017	0.0 C (32.0 F)
2018	1.8 C (35.2 F)
2019	0.1 C (32.2 F)
2020	2.7 C (36.9 F)
2021	1.9 C (35.4 F)
2022	0.8 C (33.4 F)
2023	2.3 C (36.1 F)
2024	2.2 C (36.0 F)
2025	5.0 C (41.0 F)

Wettest day (Rx1day)

The wettest day of the year at Bilma, 1938 to 2025. The record is 102.1 mm (4.0 in) in 1982, marked on the chart; the median year is 5.9 mm (0.23 in).

Wettest day (Rx1day) at Bilma by year
Year	Wettest day (Rx1day)
1938	0.0 mm (0.00 in)
1939	14.0 mm (0.6 in)
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	18.2 mm (0.7 in)
1948	3.9 mm (0.15 in)
1949	47.4 mm (1.9 in)
1950	13.2 mm (0.5 in)
1951	11.2 mm (0.4 in)
1952	26.3 mm (1.0 in)
1953	8.3 mm (0.33 in)
1954	11.7 mm (0.5 in)
1955	12.4 mm (0.5 in)
1956	5.9 mm (0.23 in)
1957	3.5 mm (0.14 in)
1958	4.5 mm (0.18 in)
1959	9.3 mm (0.37 in)
1960	3.3 mm (0.13 in)
1961	6.0 mm (0.24 in)
1962	19.0 mm (0.7 in)
1963	8.4 mm (0.33 in)
1964	17.7 mm (0.7 in)
1965	4.4 mm (0.17 in)
1966	10.7 mm (0.4 in)
1967	3.2 mm (0.13 in)
1968	18.7 mm (0.7 in)
1969	12.2 mm (0.5 in)
1970	4.9 mm (0.19 in)
1971	1.7 mm (0.07 in)
1972	18.5 mm (0.7 in)
1973	0.4 mm (0.02 in)
1974	9.2 mm (0.36 in)
1975	0.1 mm (0.00 in)
1976	23.6 mm (0.9 in)
1977	2.0 mm (0.08 in)
1978	14.6 mm (0.6 in)
1979	5.9 mm (0.23 in)
1980	1.5 mm (0.06 in)
1981	5.1 mm (0.20 in)
1982	102.1 mm (4.0 in)
1983	102.1 mm (4.0 in)
1984	0.0 mm (0.00 in)
1985	0.5 mm (0.02 in)
1986	102.1 mm (4.0 in)
1987	1.0 mm (0.04 in)
1988	9.9 mm (0.39 in)
1989	8.9 mm (0.35 in)
1990	0.3 mm (0.01 in)
1991	n/a
1992	1.0 mm (0.04 in)
1993	102.1 mm (4.0 in)
1994	102.1 mm (4.0 in)
1995	13.0 mm (0.5 in)
1996	n/a
1997	3.0 mm (0.12 in)
1998	n/a
1999	0.0 mm (0.00 in)
2000	0.8 mm (0.03 in)
2001	0.8 mm (0.03 in)
2002	0.0 mm (0.00 in)
2003	2.0 mm (0.08 in)
2004	16.0 mm (0.6 in)
2005	3.0 mm (0.12 in)
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	0.8 mm (0.03 in)
2011	5.1 mm (0.20 in)
2012	4.1 mm (0.16 in)
2013	0.0 mm (0.00 in)
2014	1.0 mm (0.04 in)
2015	7.1 mm (0.28 in)
2016	102.1 mm (4.0 in)
2017	0.5 mm (0.02 in)
2018	5.1 mm (0.20 in)
2019	6.1 mm (0.24 in)
2020	67.1 mm (2.6 in)
2021	4.1 mm (0.16 in)
2022	1.0 mm (0.04 in)
2023	4.1 mm (0.16 in)
2024	26.9 mm (1.1 in)
2025	64.5 mm (2.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Bilma, 1938 to 2025. The record is 64.5 mm (2.5 in) in 2025, marked on the chart; the median year is 6.9 mm (0.27 in).

Wettest five days (Rx5day) at Bilma by year
Year	Wettest five days (Rx5day)
1938	0.0 mm (0.00 in)
1939	16.0 mm (0.6 in)
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	18.2 mm (0.7 in)
1948	4.0 mm (0.16 in)
1949	47.4 mm (1.9 in)
1950	15.4 mm (0.6 in)
1951	11.2 mm (0.4 in)
1952	26.3 mm (1.0 in)
1953	10.4 mm (0.4 in)
1954	12.5 mm (0.5 in)
1955	12.4 mm (0.5 in)
1956	5.9 mm (0.23 in)
1957	3.5 mm (0.14 in)
1958	4.5 mm (0.18 in)
1959	3.9 mm (0.15 in)
1960	3.3 mm (0.13 in)
1961	6.0 mm (0.24 in)
1962	19.0 mm (0.7 in)
1963	8.4 mm (0.33 in)
1964	23.3 mm (0.9 in)
1965	0.0 mm (0.00 in)
1966	11.9 mm (0.5 in)
1967	3.4 mm (0.13 in)
1968	22.7 mm (0.9 in)
1969	12.2 mm (0.5 in)
1970	4.9 mm (0.19 in)
1971	1.7 mm (0.07 in)
1972	18.5 mm (0.7 in)
1973	0.4 mm (0.02 in)
1974	9.2 mm (0.36 in)
1975	0.1 mm (0.00 in)
1976	24.3 mm (1.0 in)
1977	2.0 mm (0.08 in)
1978	14.8 mm (0.6 in)
1979	5.9 mm (0.23 in)
1980	1.5 mm (0.06 in)
1981	0.0 mm (0.00 in)
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	5.0 mm (0.20 in)
2022	n/a
2023	3.3 mm (0.13 in)
2024	6.9 mm (0.27 in)
2025	64.5 mm (2.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Bilma, 1938 to 2025. The record is 365 days in 1973, marked on the chart; the median year is 31 days.

Longest dry spell (CDD) at Bilma by year
Year	Longest dry spell (CDD)
1938	31 days
1939	25 days
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	154 days
1948	228 days
1949	174 days
1950	118 days
1951	269 days
1952	208 days
1953	152 days
1954	153 days
1955	240 days
1956	219 days
1957	208 days
1958	126 days
1959	211 days
1960	192 days
1961	176 days
1962	203 days
1963	174 days
1964	204 days
1965	11 days
1966	96 days
1967	227 days
1968	159 days
1969	219 days
1970	208 days
1971	233 days
1972	153 days
1973	365 days
1974	184 days
1975	212 days
1976	148 days
1977	224 days
1978	190 days
1979	211 days
1980	159 days
1981	32 days
1982	2 days
1983	2 days
1984	1 day
1985	2 days
1986	2 days
1987	2 days
1988	3 days
1989	1 day
1990	2 days
1991	n/a
1992	2 days
1993	2 days
1994	1 day
1995	2 days
1996	n/a
1997	n/a
1998	n/a
1999	1 day
2000	2 days
2001	2 days
2002	2 days
2003	2 days
2004	2 days
2005	2 days
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	2 days
2011	1 day
2012	2 days
2013	2 days
2014	2 days
2015	2 days
2016	2 days
2017	2 days
2018	3 days
2019	2 days
2020	4 days
2021	1 day
2022	1 day
2023	4 days
2024	59 days
2025	60 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

30 years, 1947 to 1980

A day with at least 8.1 mm (0.32 in) of rain is expected about once in 2 years. A day with at least 33.6 mm (1.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Bilma: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	8.1 mm (0.32 in)
5 years	14.6 mm (0.6 in)
10 years	19.1 mm (0.8 in)
25 years	24.8 mm (1.0 in)
50 years	29.2 mm (1.1 in)	Longer than the 30 years of record
100 years	33.6 mm (1.3 in)	Longer than the 30 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, 30 years of values from 1947 to 1980.

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: 26.3 mm (1.0 in) in 1952; 23.6 mm (0.9 in) in 1976; 19.0 mm (0.7 in) in 1962.

Download the Data

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