Los Alamos Weather Records (USC00045107)

Record envelope, standing records and threshold days for Los Alamos (USC00045107), California, United States, with 115 years of record.

Key Facts for Los Alamos

Los Alamos (USC00045107) is a weather station in California, United States at 34.75 latitude and -120.28 longitude, 172 m (565 ft) above sea level.
The station reports from 1894 to 2008, 115 years of record.
1,464 records set at Los Alamos still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Los Alamos set a daily record precipitation of 50.8 mm (2.0 in) on 4 January 2008.

About the Station

Location: California, United States, 34.75 latitude, -120.28 longitude.
Elevation: 172 m (565 ft).
Period of record: 1894 to 2008, 115 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 Los Alamos. 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 Los Alamos, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	28.9 C (84.0 F)	-10.0 C (14.0 F)	n/a	n/a
Feb	31.1 C (88.0 F)	-6.7 C (19.9 F)	n/a	n/a
Mar	33.3 C (91.9 F)	-6.1 C (21.0 F)	n/a	n/a
Apr	37.8 C (100.0 F)	-1.7 C (28.9 F)	n/a	n/a
May	36.7 C (98.1 F)	1.7 C (35.1 F)	n/a	n/a
Jun	43.3 C (109.9 F)	2.8 C (37.0 F)	n/a	n/a
Jul	41.7 C (107.1 F)	5.0 C (41.0 F)	n/a	n/a
Aug	42.2 C (108.0 F)	6.1 C (43.0 F)	n/a	n/a
Sep	40.0 C (104.0 F)	4.4 C (39.9 F)	n/a	n/a
Oct	37.8 C (100.0 F)	-4.4 C (24.1 F)	n/a	n/a
Nov	35.0 C (95.0 F)	-4.4 C (24.1 F)	n/a	n/a
Dec	31.1 C (88.0 F)	-7.8 C (18.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Los Alamos still stand. 1996 holds the most, with 152.

Standing records at Los Alamos by the year they were set
Year set	Standing records
1894	1
1910	2
1911	4
1912	4
1913	9
1914	7
1915	4
1916	4
1921	4
1925	4
1929	3
1939	3
1967	10
1971	29
1972	21
1973	19
1977	49
1978	29
1979	4
1981	6
1995	33
1996	152
1997	133
1998	136
1999	133
2000	138
2001	106
2002	111
2003	81
2004	79
2005	28
2006	58
2007	25
2008	35

Wettest Day of Each Month

Feb: 147.6 mm (5.8 in)

The wettest day on record for each calendar month at Los Alamos. The most was 147.6 mm (5.8 in) on 20 February 1918.

Record daily precipitation for each month at Los Alamos
Month	Record daily precipitation (mm)	Date
Jan	86.4 mm (3.4 in)	26 January 1909
Feb	147.6 mm (5.8 in)	20 February 1918
Mar	111.3 mm (4.4 in)	1 March 1983
Apr	46.5 mm (1.8 in)	26 April 1896
May	43.7 mm (1.7 in)	9 May 1977
Jun	32.0 mm (1.3 in)	5 June 1933
Jul	22.9 mm (0.9 in)	10 July 1950
Aug	30.5 mm (1.2 in)	28 August 1913
Sep	58.9 mm (2.3 in)	11 September 1976
Oct	55.4 mm (2.2 in)	30 October 1996
Nov	54.9 mm (2.2 in)	20 November 1961
Dec	104.1 mm (4.1 in)	24 December 1916

Period of Record Coverage

1894 to 2008

32 years of record at Los Alamos, 1894 to 2008. 24 years have data for under 90 percent of days and are left out of rankings: 1894, 1910, 1913, 1914, 1915, 1916, 1921, 1925 and others.

Days with data per year at Los Alamos
Year	Days with data	Share of year	Complete
1894	1	0%	No
1910	1	0%	No
1913	7	2%	No
1914	6	2%	No
1915	2	1%	No
1916	4	1%	No
1921	4	1%	No
1925	6	2%	No
1929	3	1%	No
1939	3	1%	No
1967	10	3%	No
1971	57	16%	No
1972	30	8%	No
1973	31	8%	No
1977	91	25%	No
1978	56	15%	No
1979	30	8%	No
1981	28	8%	No
1995	87	24%	No
1996	331	90%	Yes
1997	332	91%	Yes
1998	333	91%	Yes
1999	332	91%	Yes
2000	333	91%	Yes
2001	355	97%	Yes
2002	356	98%	Yes
2003	325	89%	No
2004	340	93%	Yes
2005	229	63%	No
2006	165	45%	No
2007	95	26%	No
2008	72	20%	No

Latest Records

Latest records at Los Alamos
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
4 January 2008	Los Alamos, US	daily rain	50.8 mm (2.0 in)	12.4 mm (0.5 in)	33 years	29 of 100 (Routine)
18 December 2007	Los Alamos, US	daily rain	45.0 mm (1.8 in)	21.1 mm (0.8 in)	112 years	55 of 100 (Notable)
3 October 2006	Los Alamos, US	daily rain	2.8 mm (0.11 in)	2.8 mm (0.11 in)	111 years	20 of 100 (Routine)
4 April 2006	Los Alamos, US	daily rain	43.4 mm (1.7 in)	2.3 mm (0.09 in)	80 years	36 of 100 (Notable)
9 November 2005	Los Alamos, US	daily rain	35.6 mm (1.4 in)	4.4 mm (0.17 in)	3 years	14 of 100 (Routine)
6 May 2005	Los Alamos, US	daily rain	10.9 mm (0.4 in)	3.8 mm (0.15 in)	84 years	20 of 100 (Routine)
23 March 2005	Los Alamos, US	daily rain	43.2 mm (1.7 in)	7.4 mm (0.29 in)	10 years	18 of 100 (Routine)
30 December 2004	Los Alamos, US	daily rain	39.4 mm (1.6 in)	6.1 mm (0.24 in)	13 years	17 of 100 (Routine)
27 December 2004	Los Alamos, US	daily rain	80.0 mm (3.1 in)	10.1 mm (0.4 in)	33 years	26 of 100 (Routine)
26 October 2004	Los Alamos, US	daily rain	39.4 mm (1.6 in)	30.8 mm (1.2 in)	77 years	69 of 100 (Major)
19 October 2004	Los Alamos, US	daily rain	44.5 mm (1.8 in)	34.8 mm (1.4 in)	68 years	70 of 100 (Major)
16 October 2004	Los Alamos, US	daily rain	22.9 mm (0.9 in)	0.3 mm (0.01 in)	41 years	20 of 100 (Routine)
3 November 2003	Los Alamos, US	daily rain	12.7 mm (0.5 in)	7.6 mm (0.30 in)	45 years	20 of 100 (Routine)
13 April 2003	Los Alamos, US	daily rain	36.8 mm (1.4 in)	26.6 mm (1.0 in)	26 years	45 of 100 (Notable)
20 December 2002	Los Alamos, US	daily rain	38.4 mm (1.5 in)	2.6 mm (0.10 in)	49 years	25 of 100 (Routine)
16 December 2002	Los Alamos, US	daily rain	43.4 mm (1.7 in)	19.5 mm (0.8 in)	64 years	43 of 100 (Notable)
9 November 2002	Los Alamos, US	daily rain	31.2 mm (1.2 in)	3.8 mm (0.15 in)	80 years	37 of 100 (Notable)
8 November 2002	Los Alamos, US	daily rain	39.9 mm (1.6 in)	2.3 mm (0.09 in)	3 years	12 of 100 (Routine)
21 December 2001	Los Alamos, US	daily rain	33.0 mm (1.3 in)	6.8 mm (0.27 in)	31 years	24 of 100 (Routine)
25 November 2001	Los Alamos, US	daily rain	27.9 mm (1.1 in)	5.0 mm (0.20 in)	104 years	44 of 100 (Notable)

Extremes by Year

1894 to 2008

Yearly extremes at Los Alamos: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.3 C (109.9 F)	1929	35.9 C (96.5 F)	32
Coldest night (TNn)	-10.0 C (14.0 F)	1913	-4.4 C (24.1 F)	29
Wettest day (Rx1day)	147.6 mm (5.8 in)	1918	46.1 mm (1.8 in)	106
Wettest five days (Rx5day)	204.6 mm (8.1 in)	1983	83.0 mm (3.3 in)	106
Longest dry spell (CDD)	215 days	1965	126 days	106

Hottest day (TXx)

The hottest day of the year at Los Alamos, 1894 to 2008. The record is 43.3 C (109.9 F) in 1929, marked on the chart; the median year is 35.9 C (96.5 F).

Hottest day (TXx) at Los Alamos by year
Year	Hottest day (TXx)
1894	42.2 C (108.0 F)
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	n/a
1909	n/a
1910	32.2 C (90.0 F)
1911	n/a
1912	n/a
1913	36.7 C (98.1 F)
1914	34.4 C (93.9 F)
1915	-2.2 C (28.0 F)
1916	31.1 C (88.0 F)
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	37.8 C (100.0 F)
1922	n/a
1923	n/a
1924	n/a
1925	41.7 C (107.1 F)
1926	n/a
1927	n/a
1928	n/a
1929	43.3 C (109.9 F)
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	40.0 C (104.0 F)
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
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	19.4 C (66.9 F)
1968	n/a
1969	n/a
1970	n/a
1971	37.8 C (100.0 F)
1972	26.1 C (79.0 F)
1973	33.9 C (93.0 F)
1974	n/a
1975	n/a
1976	n/a
1977	31.1 C (88.0 F)
1978	35.0 C (95.0 F)
1979	26.7 C (80.1 F)
1980	n/a
1981	27.2 C (81.0 F)
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	36.7 C (98.1 F)
1996	38.9 C (102.0 F)
1997	38.9 C (102.0 F)
1998	38.9 C (102.0 F)
1999	35.6 C (96.1 F)
2000	36.1 C (97.0 F)
2001	36.1 C (97.0 F)
2002	37.8 C (100.0 F)
2003	36.1 C (97.0 F)
2004	37.8 C (100.0 F)
2005	35.0 C (95.0 F)
2006	35.6 C (96.1 F)
2007	35.0 C (95.0 F)
2008	28.9 C (84.0 F)

Coldest night (TNn)

The coldest night of the year at Los Alamos, 1894 to 2008. The record is -10.0 C (14.0 F) in 1913, marked on the chart; the median year is -4.4 C (24.1 F).

Coldest night (TNn) at Los Alamos by year
Year	Coldest night (TNn)
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	n/a
1909	n/a
1910	-5.0 C (23.0 F)
1911	-6.7 C (19.9 F)
1912	-6.7 C (19.9 F)
1913	-10.0 C (14.0 F)
1914	-4.4 C (24.1 F)
1915	-3.3 C (26.1 F)
1916	4.4 C (39.9 F)
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
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	0.0 C (32.0 F)
1968	n/a
1969	n/a
1970	n/a
1971	-5.0 C (23.0 F)
1972	-6.1 C (21.0 F)
1973	0.0 C (32.0 F)
1974	n/a
1975	n/a
1976	n/a
1977	-6.1 C (21.0 F)
1978	1.7 C (35.1 F)
1979	-1.1 C (30.0 F)
1980	n/a
1981	-5.0 C (23.0 F)
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	-1.7 C (28.9 F)
1996	-2.8 C (27.0 F)
1997	-3.3 C (26.1 F)
1998	-7.8 C (18.0 F)
1999	-3.3 C (26.1 F)
2000	-4.4 C (24.1 F)
2001	-3.9 C (25.0 F)
2002	-5.0 C (23.0 F)
2003	-3.3 C (26.1 F)
2004	-6.7 C (19.9 F)
2005	-3.3 C (26.1 F)
2006	-3.9 C (25.0 F)
2007	-8.9 C (16.0 F)
2008	-5.0 C (23.0 F)

Wettest day (Rx1day)

The wettest day of the year at Los Alamos, 1894 to 2008. The record is 147.6 mm (5.8 in) in 1918, marked on the chart; the median year is 46.1 mm (1.8 in).

Wettest day (Rx1day) at Los Alamos by year
Year	Wettest day (Rx1day)
1894	34.3 mm (1.4 in)
1895	45.0 mm (1.8 in)
1896	48.0 mm (1.9 in)
1897	28.7 mm (1.1 in)
1898	29.2 mm (1.1 in)
1899	31.0 mm (1.2 in)
1909	86.4 mm (3.4 in)
1910	37.3 mm (1.5 in)
1911	78.7 mm (3.1 in)
1912	47.0 mm (1.9 in)
1913	36.6 mm (1.4 in)
1914	88.9 mm (3.5 in)
1915	59.9 mm (2.4 in)
1916	104.1 mm (4.1 in)
1917	13.0 mm (0.5 in)
1918	147.6 mm (5.8 in)
1919	28.2 mm (1.1 in)
1920	29.2 mm (1.1 in)
1921	54.9 mm (2.2 in)
1922	45.5 mm (1.8 in)
1923	23.4 mm (0.9 in)
1924	32.5 mm (1.3 in)
1925	41.1 mm (1.6 in)
1926	53.8 mm (2.1 in)
1927	74.2 mm (2.9 in)
1928	34.8 mm (1.4 in)
1929	21.6 mm (0.9 in)
1930	37.3 mm (1.5 in)
1931	50.3 mm (2.0 in)
1932	36.8 mm (1.4 in)
1933	53.8 mm (2.1 in)
1934	41.7 mm (1.6 in)
1935	26.2 mm (1.0 in)
1936	40.1 mm (1.6 in)
1937	37.1 mm (1.5 in)
1938	54.6 mm (2.1 in)
1939	47.0 mm (1.9 in)
1940	48.3 mm (1.9 in)
1941	98.3 mm (3.9 in)
1942	38.9 mm (1.5 in)
1943	71.9 mm (2.8 in)
1944	54.1 mm (2.1 in)
1945	51.3 mm (2.0 in)
1946	54.4 mm (2.1 in)
1947	11.7 mm (0.5 in)
1948	35.8 mm (1.4 in)
1949	59.2 mm (2.3 in)
1950	35.3 mm (1.4 in)
1951	30.5 mm (1.2 in)
1952	90.9 mm (3.6 in)
1953	52.1 mm (2.1 in)
1954	38.9 mm (1.5 in)
1955	80.0 mm (3.1 in)
1956	56.9 mm (2.2 in)
1957	31.2 mm (1.2 in)
1958	46.7 mm (1.8 in)
1959	52.1 mm (2.1 in)
1960	58.4 mm (2.3 in)
1961	54.9 mm (2.2 in)
1962	66.3 mm (2.6 in)
1963	67.3 mm (2.6 in)
1964	34.0 mm (1.3 in)
1965	50.3 mm (2.0 in)
1966	35.3 mm (1.4 in)
1967	48.0 mm (1.9 in)
1968	36.6 mm (1.4 in)
1969	62.5 mm (2.5 in)
1970	40.6 mm (1.6 in)
1971	69.9 mm (2.8 in)
1972	13.5 mm (0.5 in)
1973	49.3 mm (1.9 in)
1974	79.8 mm (3.1 in)
1975	57.9 mm (2.3 in)
1976	58.9 mm (2.3 in)
1977	43.7 mm (1.7 in)
1978	78.0 mm (3.1 in)
1979	38.9 mm (1.5 in)
1980	46.7 mm (1.8 in)
1981	62.2 mm (2.4 in)
1982	38.9 mm (1.5 in)
1983	111.3 mm (4.4 in)
1984	36.3 mm (1.4 in)
1985	25.1 mm (1.0 in)
1986	42.9 mm (1.7 in)
1987	37.8 mm (1.5 in)
1988	35.6 mm (1.4 in)
1989	11.2 mm (0.4 in)
1990	33.0 mm (1.3 in)
1991	93.7 mm (3.7 in)
1992	54.4 mm (2.1 in)
1993	50.3 mm (2.0 in)
1994	28.2 mm (1.1 in)
1995	63.5 mm (2.5 in)
1996	62.7 mm (2.5 in)
1997	42.7 mm (1.7 in)
1998	81.8 mm (3.2 in)
1999	37.6 mm (1.5 in)
2000	39.6 mm (1.6 in)
2001	55.9 mm (2.2 in)
2002	43.4 mm (1.7 in)
2003	36.8 mm (1.4 in)
2004	80.0 mm (3.1 in)
2005	43.2 mm (1.7 in)
2006	43.4 mm (1.7 in)
2007	45.0 mm (1.8 in)
2008	50.8 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Los Alamos, 1894 to 2008. The record is 204.6 mm (8.1 in) in 1983, marked on the chart; the median year is 83.0 mm (3.3 in).

Wettest five days (Rx5day) at Los Alamos by year
Year	Wettest five days (Rx5day)
1894	46.0 mm (1.8 in)
1895	126.2 mm (5.0 in)
1896	53.0 mm (2.1 in)
1897	68.0 mm (2.7 in)
1898	35.0 mm (1.4 in)
1899	59.0 mm (2.3 in)
1909	128.6 mm (5.1 in)
1910	78.7 mm (3.1 in)
1911	183.4 mm (7.2 in)
1912	59.7 mm (2.4 in)
1913	68.4 mm (2.7 in)
1914	159.0 mm (6.3 in)
1915	112.0 mm (4.4 in)
1916	142.2 mm (5.6 in)
1917	4.8 mm (0.19 in)
1918	188.4 mm (7.4 in)
1919	52.7 mm (2.1 in)
1920	53.1 mm (2.1 in)
1921	106.1 mm (4.2 in)
1922	76.7 mm (3.0 in)
1923	48.6 mm (1.9 in)
1924	41.9 mm (1.6 in)
1925	83.5 mm (3.3 in)
1926	117.4 mm (4.6 in)
1927	109.7 mm (4.3 in)
1928	75.9 mm (3.0 in)
1929	43.2 mm (1.7 in)
1930	67.1 mm (2.6 in)
1931	106.7 mm (4.2 in)
1932	57.9 mm (2.3 in)
1933	100.0 mm (3.9 in)
1934	71.0 mm (2.8 in)
1935	52.6 mm (2.1 in)
1936	90.2 mm (3.6 in)
1937	65.5 mm (2.6 in)
1938	101.1 mm (4.0 in)
1939	50.5 mm (2.0 in)
1940	88.7 mm (3.5 in)
1941	134.7 mm (5.3 in)
1942	147.2 mm (5.8 in)
1943	142.2 mm (5.6 in)
1944	128.5 mm (5.1 in)
1945	97.6 mm (3.8 in)
1946	115.4 mm (4.5 in)
1947	16.0 mm (0.6 in)
1948	49.2 mm (1.9 in)
1949	62.0 mm (2.4 in)
1950	35.8 mm (1.4 in)
1951	64.6 mm (2.5 in)
1952	110.0 mm (4.3 in)
1953	53.9 mm (2.1 in)
1954	70.6 mm (2.8 in)
1955	137.9 mm (5.4 in)
1956	110.0 mm (4.3 in)
1957	48.1 mm (1.9 in)
1958	119.4 mm (4.7 in)
1959	61.2 mm (2.4 in)
1960	86.3 mm (3.4 in)
1961	66.8 mm (2.6 in)
1962	197.4 mm (7.8 in)
1963	98.3 mm (3.9 in)
1964	42.2 mm (1.7 in)
1965	78.2 mm (3.1 in)
1966	76.7 mm (3.0 in)
1967	111.0 mm (4.4 in)
1968	39.6 mm (1.6 in)
1969	124.2 mm (4.9 in)
1970	80.0 mm (3.1 in)
1971	115.8 mm (4.6 in)
1972	30.3 mm (1.2 in)
1973	76.2 mm (3.0 in)
1974	117.5 mm (4.6 in)
1975	94.2 mm (3.7 in)
1976	155.5 mm (6.1 in)
1977	64.8 mm (2.6 in)
1978	170.7 mm (6.7 in)
1979	76.3 mm (3.0 in)
1980	142.2 mm (5.6 in)
1981	119.4 mm (4.7 in)
1982	70.1 mm (2.8 in)
1983	204.6 mm (8.1 in)
1984	59.1 mm (2.3 in)
1985	52.9 mm (2.1 in)
1986	98.6 mm (3.9 in)
1987	82.5 mm (3.2 in)
1988	87.6 mm (3.4 in)
1989	20.2 mm (0.8 in)
1990	57.9 mm (2.3 in)
1991	165.8 mm (6.5 in)
1992	124.1 mm (4.9 in)
1993	115.0 mm (4.5 in)
1994	57.7 mm (2.3 in)
1995	126.2 mm (5.0 in)
1996	107.2 mm (4.2 in)
1997	77.2 mm (3.0 in)
1998	187.7 mm (7.4 in)
1999	62.0 mm (2.4 in)
2000	114.8 mm (4.5 in)
2001	97.4 mm (3.8 in)
2002	89.4 mm (3.5 in)
2003	41.9 mm (1.6 in)
2004	142.2 mm (5.6 in)
2005	108.8 mm (4.3 in)
2006	70.1 mm (2.8 in)
2007	56.2 mm (2.2 in)
2008	180.9 mm (7.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Los Alamos, 1894 to 2008. The record is 215 days in 1965, marked on the chart; the median year is 126 days.

Longest dry spell (CDD) at Los Alamos by year
Year	Longest dry spell (CDD)
1894	34 days
1895	29 days
1896	27 days
1897	64 days
1898	26 days
1899	40 days
1909	61 days
1910	80 days
1911	197 days
1912	168 days
1913	61 days
1914	61 days
1915	44 days
1916	31 days
1917	16 days
1918	33 days
1919	42 days
1920	21 days
1921	34 days
1922	26 days
1923	35 days
1924	35 days
1925	27 days
1926	93 days
1927	170 days
1928	41 days
1929	178 days
1930	136 days
1931	93 days
1932	148 days
1933	147 days
1934	132 days
1935	116 days
1936	68 days
1937	168 days
1938	149 days
1939	136 days
1940	180 days
1941	74 days
1942	78 days
1943	193 days
1944	169 days
1945	114 days
1946	127 days
1947	73 days
1948	131 days
1949	172 days
1950	108 days
1951	126 days
1952	201 days
1953	187 days
1954	196 days
1955	189 days
1956	146 days
1957	122 days
1958	107 days
1959	144 days
1960	160 days
1961	196 days
1962	149 days
1963	57 days
1964	57 days
1965	215 days
1966	171 days
1967	94 days
1968	48 days
1969	125 days
1970	126 days
1971	124 days
1972	73 days
1973	47 days
1974	186 days
1975	164 days
1976	65 days
1977	140 days
1978	132 days
1979	144 days
1980	94 days
1981	164 days
1982	156 days
1983	107 days
1984	146 days
1985	206 days
1986	168 days
1987	138 days
1988	142 days
1989	129 days
1990	113 days
1991	112 days
1992	98 days
1993	127 days
1994	104 days
1995	177 days
1996	162 days
1997	161 days
1998	97 days
1999	136 days
2000	123 days
2001	115 days
2002	171 days
2003	179 days
2004	204 days
2005	186 days
2006	133 days
2007	109 days
2008	68 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

74 years, 1911 to 2005

A day with at least 48.1 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 109.5 mm (4.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Los Alamos: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	48.1 mm (1.9 in)
5 years	66.1 mm (2.6 in)
10 years	77.4 mm (3.0 in)
25 years	90.9 mm (3.6 in)
50 years	100.4 mm (4.0 in)
100 years	109.5 mm (4.3 in)	Longer than the 74 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, 74 years of values from 1911 to 2005.

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: 111.3 mm (4.4 in) in 1983; 98.3 mm (3.9 in) in 1941; 93.7 mm (3.7 in) in 1991.

Download the Data

Data for Los Alamos standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Los Alamos 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 2026-10-14 (14 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).