Altrier Threshold Days by Year (LUE00100944)

3 fixed thresholds counted per year at Altrier (LUE00100944): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Altrier Thresholds

Altrier: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 2000 with 40.
Altrier: days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 1967 with 5.
Altrier: days with 50 mm (1.97 in) or more of precipitation in 3 years, most in 1970 with 1.
3 fixed thresholds have at least one qualifying day at Altrier.

Days with 10 mm (0.39 in) or more of precipitation

50 years with a qualifying day

Days per year at Altrier with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 40 in 2000.

Days with 10 mm (0.39 in) or more of precipitation per year at Altrier
Year	Days	Decade average
1954	17	19
1955	23	19
1956	16	19
1957	12	19
1958	29	19
1959	17	19
1960	23	21.7
1961	23	21.7
1962	13	21.7
1963	15	21.7
1964	15	21.7
1965	31	21.7
1966	29	21.7
1967	28	21.7
1968	23	21.7
1969	17	21.7
1970	24	21.4
1971	19	21.4
1972	19	21.4
1973	14	21.4
1974	25	21.4
1975	19	21.4
1976	15	21.4
1977	32	21.4
1978	22	21.4
1979	25	21.4
1980	29	24.6
1981	36	24.6
1982	25	24.6
1983	19	24.6
1984	27	24.6
1985	15	24.6
1986	20	24.6
1987	24	24.6
1988	24	24.6
1989	27	24.6
1990	19	21.6
1991	17	21.6
1992	20	21.6
1993	25	21.6
1994	16	21.6
1995	35	21.6
1996	17	21.6
1997	27	21.6
1998	21	21.6
1999	19	21.6
2000	40	30
2001	33	30
2002	23	30
2003	24	30

For each year, a bar from the first to the last day at Altrier meeting 10 mm (0.39 in).

First to last qualifying date each year at Altrier
Year	First date	Last date
1954	1954-02-25	1954-12-08
1955	1955-01-12	1955-12-29
1956	1956-01-23	1956-11-27
1957	1957-02-13	1957-10-19
1958	1958-01-05	1958-12-19
1959	1959-01-06	1959-12-25
1960	1960-01-28	1960-12-21
1961	1961-01-02	1961-12-03
1962	1962-01-09	1962-12-11
1963	1963-01-03	1963-11-19
1964	1964-03-19	1964-12-31
1965	1965-01-07	1965-12-25
1966	1966-01-01	1966-12-29
1967	1967-01-05	1967-12-23
1968	1968-01-05	1968-12-22
1969	1969-03-13	1969-11-24
1970	1970-01-26	1970-12-30
1971	1971-01-23	1971-11-28
1972	1972-02-11	1972-11-17
1973	1973-02-12	1973-11-05
1974	1974-01-07	1974-12-27
1975	1975-01-22	1975-12-02
1976	1976-02-12	1976-12-31
1977	1977-01-01	1977-12-27
1978	1978-03-02	1978-12-31
1979	1979-02-01	1979-12-18
1980	1980-01-21	1980-12-20
1981	1981-01-14	1981-12-30
1982	1982-01-04	1982-12-20
1983	1983-01-31	1983-12-18
1984	1984-01-02	1984-11-23
1985	1985-01-25	1985-12-26
1986	1986-01-22	1986-12-18
1987	1987-01-01	1987-12-18
1988	1988-01-02	1988-12-09
1989	1989-02-25	1989-12-22
1990	1990-01-23	1990-12-29
1991	1991-01-03	1991-12-17
1992	1992-03-12	1992-12-04
1993	1993-01-10	1993-12-31
1994	1994-01-03	1994-12-29
1995	1995-01-11	1995-12-23
1996	1996-02-12	1996-12-03
1997	1997-02-12	1997-12-20
1998	1998-01-02	1998-12-26
1999	1999-01-03	1999-12-26
2000	2000-02-29	2000-12-14
2001	2001-01-01	2001-12-29
2002	2002-01-23	2002-12-29
2003	2003-01-01	2003-12-21

Every Fixed Threshold

Fixed thresholds at Altrier
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	50	40	2000	24
25 mm (0.98 in): Days with 25 mm or more rain	41	5	1967	3
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1970	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.

Download the Data

Data for Altrier 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).

Altrier Threshold Days by Year (LUE00100944)

Key Facts for Altrier Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

Related