Bilma Threshold Days by Year (NG000061017)

14 fixed thresholds counted per year at Bilma (NG000061017): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Bilma Thresholds

Bilma: days with a maximum temperature at or above 30 C (86 F) in 50 years, most in 1940 with 312.
Bilma: days with a maximum temperature at or above 35 C (95 F) in 50 years, most in 1962 with 259.
Bilma: days with a maximum temperature at or above 40 C (104 F) in 50 years, most in 2018 with 184.
Bilma: days with a maximum temperature at or above 90 F (32.2 C) in 50 years, most in 1962 with 285.
14 fixed thresholds have at least one qualifying day at Bilma.

Days at or above 30 C (86 F)

50 years with a qualifying day

Days per year at Bilma with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 312 in 1940.

Days at or above 30 C (86 F) per year at Bilma
Year	Days	Decade average
1939	283	283
1940	312	288.7
1941	271	288.7
1942	302	288.7
1943	282	288.7
1944	281	288.7
1947	311	288.7
1948	262	288.7
1950	268	288.1
1951	280	288.1
1952	287	288.1
1953	288	288.1
1954	281	288.1
1955	294	288.1
1956	297	288.1
1957	298	288.1
1958	296	288.1
1959	292	288.1
1960	300	285.2
1961	254	285.2
1962	295	285.2
1963	294	285.2
1964	282	285.2
1965	279	285.2
1966	275	285.2
1967	280	285.2
1968	287	285.2
1969	306	285.2
1970	278	274.2
1971	286	274.2
1972	271	274.2
1973	287	274.2
1974	263	274.2
1975	255	274.2
1976	279	274.2
1977	256	274.2
1978	281	274.2
1979	286	274.2
1980	275	275
2011	277	289.9
2012	297	289.9
2013	297	289.9
2016	301	289.9
2017	290	289.9
2018	287	289.9
2019	280	289.9
2020	278	254.8
2022	273	254.8
2023	274	254.8
2025	194	254.8

For each year, a bar from the first to the last day at Bilma meeting 30 C (86 F).

First to last qualifying date each year at Bilma
Year	First date	Last date
1939	1939-01-01	1939-12-31
1940	1940-01-01	1940-12-09
1941	1941-01-06	1941-12-31
1942	1942-01-01	1942-12-31
1943	1943-01-01	1943-12-31
1944	1944-02-13	1944-12-29
1947	1947-01-25	1947-12-21
1948	1948-01-10	1948-12-28
1950	1950-01-03	1950-12-27
1951	1951-01-01	1951-11-22
1952	1952-01-23	1952-12-15
1953	1953-01-01	1953-12-28
1954	1954-01-05	1954-12-12
1955	1955-01-25	1955-12-13
1956	1956-01-07	1956-12-24
1957	1957-01-17	1957-12-31
1958	1958-01-12	1958-12-29
1959	1959-01-03	1959-12-15
1960	1960-01-12	1960-12-26
1961	1961-01-15	1961-12-19
1962	1962-01-06	1962-12-17
1963	1963-01-14	1963-12-23
1964	1964-01-28	1964-12-31
1965	1965-01-01	1965-12-30
1966	1966-01-17	1966-12-06
1967	1967-01-12	1967-12-31
1968	1968-01-01	1968-12-20
1969	1969-01-02	1969-12-16
1970	1970-01-03	1970-12-29
1971	1971-02-10	1971-12-11
1972	1972-01-30	1972-12-31
1973	1973-01-01	1973-12-23
1974	1974-02-17	1974-11-16
1975	1975-02-05	1975-12-21
1976	1976-01-10	1976-12-27
1977	1977-01-24	1977-12-06
1978	1978-01-08	1978-12-23
1979	1979-01-12	1979-12-23
1980	1980-01-14	1980-12-03
2011	2011-01-25	2011-12-07
2012	2012-01-24	2012-12-14
2013	2013-01-20	2013-12-10
2016	2016-01-06	2016-12-22
2017	2017-01-19	2017-12-21
2018	2018-01-18	2018-11-27
2019	2019-02-01	2019-12-09
2020	2020-01-13	2020-12-22
2022	2022-02-09	2022-12-16
2023	2023-01-23	2023-12-07
2025	2025-01-16	2025-08-24

Every Fixed Threshold

Fixed thresholds at Bilma
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	50	312	1940	194
35 C (95 F): Days	50	259	1962	165
40 C (104 F): Days	50	184	2018	126
45 C (113 F): Days	39	46	1939	20
90 F (32.2 C): Days	50	285	1962	179
100 F (37.8 C): Days	50	225	2018	144
110 F (43.3 C): Days	50	87	2023	67
120 F (48.9 C): Days	1	1	2016	1
0 C (32 F): Frost days (min	4	10	1944	1
20 C (68 F): Tropical nights (min	46	201	1969	120
25 C (77 F): Days with min	46	104	1953	68
10 mm (0.39 in): Days with 10 mm or more rain	13	1	1947	1
25 mm (0.98 in): Days with 25 mm or more rain	2	1	1952	1
50 mm (1.97 in): Days with 50 mm or more rain	1	0	n/a	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1939.

Download the Data

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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

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

Bilma Threshold Days by Year (NG000061017)

Key Facts for Bilma Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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