Black Rock Weather Records (USC00030746)

Record envelope, standing records and threshold days for Black Rock (USC00030746), Arkansas, United States, with 135 years of record.

Key Facts for Black Rock

Black Rock (USC00030746) is a weather station in Arkansas, United States at 36.13 latitude and -91.12 longitude, 110 m (360 ft) above sea level.
The station reports from 1892 to 2026, 135 years of record.
170 records set at Black Rock still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Black Rock set a daily record precipitation of 78.7 mm (3.1 in) on 22 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Arkansas, United States, 36.13 latitude, -91.12 longitude.
Elevation: 110 m (360 ft).
Period of record: 1892 to 2026, 135 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 Black Rock. 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 Black Rock, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	21.1 C (70.0 F)	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	-11.1 C (12.0 F)	n/a	n/a	n/a
Dec	n/a	7.8 C (46.0 F)	n/a	n/a

Which Years Hold Standing Records

170 standing records

170 records at Black Rock still stand. 1974 holds the most, with 58.

All-Time Record Progression

4 new records

4 all-time records were set at Black Rock between 2 January 1966 and 26 December 2012. Each dot is a new record.

When Black Rock set new all-time records
Date	Kind	Detail
1966-01-02	Record daily precipitation	Record daily precipitation 164.3 mm (6.5 in)
1977-01-10	Record daily snowfall	Record daily snowfall 21.6 cm (8.5 in)
1979-09-21	Record daily precipitation	Record daily precipitation 168.7 mm (6.6 in)
2012-12-26	Record daily snowfall	Record daily snowfall 22.9 cm (9.0 in)

Wettest Day of Each Month

Sep: 168.7 mm (6.6 in)

The wettest day on record for each calendar month at Black Rock. The most was 168.7 mm (6.6 in) on 21 September 1979.

Record daily precipitation for each month at Black Rock
Month	Record daily precipitation (mm)	Date
Jan	164.3 mm (6.5 in)	2 January 1966
Feb	99.1 mm (3.9 in)	15 February 1989
Mar	148.6 mm (5.9 in)	28 March 1977
Apr	117.1 mm (4.6 in)	23 April 1973
May	136.1 mm (5.4 in)	11 May 1968
Jun	139.7 mm (5.5 in)	29 June 2019
Jul	133.9 mm (5.3 in)	19 July 2002
Aug	137.2 mm (5.4 in)	28 August 2020
Sep	168.7 mm (6.6 in)	21 September 1979
Oct	157.0 mm (6.2 in)	6 October 1998
Nov	158.2 mm (6.2 in)	20 November 1991
Dec	102.1 mm (4.0 in)	3 December 1978

Period of Record Coverage

1977 to 1978

2 years of record at Black Rock, 1977 to 1978. 2 years have data for under 90 percent of days and are left out of rankings: 1977, 1978.

Latest Records

Latest records at Black Rock
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
22 September 2026	Black Rock, US	daily rain (Provisional)	78.7 mm (3.1 in)	6.3 mm (0.25 in)	20 years	19 of 100 (Routine)
22 June 2026	Black Rock, US	daily rain	60.7 mm (2.4 in)	25.1 mm (1.0 in)	36 years	38 of 100 (Notable)
28 January 2026	Black Rock, US	daily snow depth	17.8 cm (7.0 in)	17.8 cm (7.0 in)	96 years	78 of 100 (Major)
27 January 2026	Black Rock, US	monthly snow depth (Tie)	20.3 cm (8.0 in)	tie	15 years	6 of 100 (Routine)
26 January 2026	Black Rock, US	monthly snow depth (Tie)	20.3 cm (8.0 in)	tie	15 years	6 of 100 (Routine)
25 January 2026	Black Rock, US	daily snowfall	17.8 cm (7.0 in)	10.2 cm (4.0 in)	3 years	33 of 100 (Routine)
25 January 2026	Black Rock, US	monthly snow depth (Tie)	20.3 cm (8.0 in)	tie	15 years	6 of 100 (Routine)
26 October 2025	Black Rock, US	daily rain	52.8 mm (2.1 in)	12.2 mm (0.5 in)	88 years	43 of 100 (Notable)
19 October 2025	Black Rock, US	daily rain	53.6 mm (2.1 in)	19.3 mm (0.8 in)	120 years	51 of 100 (Notable)
20 August 2025	Black Rock, US	daily rain	55.9 mm (2.2 in)	2.3 mm (0.09 in)	110 years	41 of 100 (Notable)
17 June 2025	Black Rock, US	daily rain	72.6 mm (2.9 in)	17.7 mm (0.7 in)	80 years	46 of 100 (Notable)
19 February 2025	Black Rock, US	daily snowfall (Tie)	5.1 cm (2.0 in)	tie	99 years	9 of 100 (Routine)
16 February 2025	Black Rock, US	daily rain	62.0 mm (2.4 in)	25.7 mm (1.0 in)	71 years	48 of 100 (Notable)
13 January 2025	Black Rock, US	daily snow depth	10.2 cm (4.0 in)	2.6 cm (1.0 in)	104 years	47 of 100 (Notable)
11 January 2025	Black Rock, US	daily snowfall	17.3 cm (6.8 in)	3.3 cm (1.3 in)	107 years	47 of 100 (Notable)
11 January 2025	Black Rock, US	daily snow depth	17.8 cm (7.0 in)	2.6 cm (1.0 in)	107 years	47 of 100 (Notable)
10 January 2025	Black Rock, US	daily snow depth	10.2 cm (4.0 in)	7.7 cm (3.0 in)	85 years	56 of 100 (Notable)
29 December 2024	Black Rock, US	daily rain	52.8 mm (2.1 in)	9.4 mm (0.37 in)	11 years	18 of 100 (Routine)
9 July 2024	Black Rock, US	daily rain	55.1 mm (2.2 in)	17.0 mm (0.7 in)	94 years	49 of 100 (Notable)
15 March 2024	Black Rock, US	daily rain	26.7 mm (1.1 in)	2.6 mm (0.10 in)	3 years	11 of 100 (Routine)

Extremes by Year

1892 to 2026

Yearly extremes at Black Rock: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	21.1 C (70.0 F)	1978	5.0 C (41.0 F)	2
Coldest night (TNn)	7.8 C (46.0 F)	1974	7.8 C (46.0 F)	1
Wettest day (Rx1day)	168.7 mm (6.6 in)	1979	80.1 mm (3.2 in)	122
Wettest five days (Rx5day)	259.3 mm (10.2 in)	2016	129.0 mm (5.1 in)	122
Longest dry spell (CDD)	72 days	1904	22 days	122

Hottest day (TXx)

The hottest day of the year at Black Rock, 1892 to 2026. The record is 21.1 C (70.0 F) in 1978, marked on the chart; the median year is 5.0 C (41.0 F).

Hottest day (TXx) at Black Rock by year
Year	Hottest day (TXx)
1892	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
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	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	-11.1 C (12.0 F)
1978	21.1 C (70.0 F)
1979	n/a
1980	n/a
1981	n/a
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
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2022	n/a
2023	n/a
2024	n/a
2025	n/a
2026	n/a

Coldest night (TNn)

The coldest night of the year at Black Rock, 1892 to 2026. The record is 7.8 C (46.0 F) in 1974, marked on the chart; the median year is 7.8 C (46.0 F).

Coldest night (TNn) at Black Rock by year
Year	Coldest night (TNn)
1892	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
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	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	7.8 C (46.0 F)
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
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
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2022	n/a
2023	n/a
2024	n/a
2025	n/a
2026	n/a

Wettest day (Rx1day)

The wettest day of the year at Black Rock, 1892 to 2026. The record is 168.7 mm (6.6 in) in 1979, marked on the chart; the median year is 80.1 mm (3.2 in).

Wettest day (Rx1day) at Black Rock by year
Year	Wettest day (Rx1day)
1892	86.9 mm (3.4 in)
1904	38.1 mm (1.5 in)
1905	96.5 mm (3.8 in)
1906	63.5 mm (2.5 in)
1907	107.4 mm (4.2 in)
1908	59.9 mm (2.4 in)
1909	58.9 mm (2.3 in)
1910	65.8 mm (2.6 in)
1911	82.8 mm (3.3 in)
1912	74.9 mm (2.9 in)
1913	120.7 mm (4.8 in)
1914	47.0 mm (1.9 in)
1915	55.1 mm (2.2 in)
1916	50.3 mm (2.0 in)
1917	54.6 mm (2.1 in)
1918	89.7 mm (3.5 in)
1919	86.4 mm (3.4 in)
1920	91.4 mm (3.6 in)
1921	75.4 mm (3.0 in)
1922	87.1 mm (3.4 in)
1923	113.8 mm (4.5 in)
1924	75.7 mm (3.0 in)
1925	69.9 mm (2.8 in)
1926	85.6 mm (3.4 in)
1927	78.0 mm (3.1 in)
1928	79.2 mm (3.1 in)
1929	60.2 mm (2.4 in)
1930	64.8 mm (2.6 in)
1931	82.6 mm (3.3 in)
1932	82.6 mm (3.3 in)
1933	87.4 mm (3.4 in)
1934	74.7 mm (2.9 in)
1935	108.7 mm (4.3 in)
1936	50.8 mm (2.0 in)
1937	71.1 mm (2.8 in)
1938	62.7 mm (2.5 in)
1939	59.7 mm (2.4 in)
1940	72.1 mm (2.8 in)
1941	75.7 mm (3.0 in)
1942	81.0 mm (3.2 in)
1943	95.5 mm (3.8 in)
1944	59.7 mm (2.4 in)
1945	100.1 mm (3.9 in)
1946	76.2 mm (3.0 in)
1947	57.4 mm (2.3 in)
1948	64.3 mm (2.5 in)
1949	81.5 mm (3.2 in)
1950	83.8 mm (3.3 in)
1951	75.4 mm (3.0 in)
1952	71.6 mm (2.8 in)
1953	57.2 mm (2.3 in)
1954	49.5 mm (1.9 in)
1955	44.7 mm (1.8 in)
1956	70.1 mm (2.8 in)
1957	82.6 mm (3.3 in)
1958	69.1 mm (2.7 in)
1959	85.1 mm (3.4 in)
1960	78.7 mm (3.1 in)
1961	58.4 mm (2.3 in)
1962	67.1 mm (2.6 in)
1963	72.4 mm (2.9 in)
1964	69.1 mm (2.7 in)
1965	113.0 mm (4.4 in)
1966	164.3 mm (6.5 in)
1967	50.8 mm (2.0 in)
1968	136.1 mm (5.4 in)
1969	105.2 mm (4.1 in)
1970	128.3 mm (5.1 in)
1971	56.4 mm (2.2 in)
1972	82.6 mm (3.3 in)
1973	120.4 mm (4.7 in)
1974	48.3 mm (1.9 in)
1975	102.6 mm (4.0 in)
1976	82.8 mm (3.3 in)
1977	148.6 mm (5.9 in)
1978	102.1 mm (4.0 in)
1979	168.7 mm (6.6 in)
1980	66.3 mm (2.6 in)
1981	56.4 mm (2.2 in)
1982	92.2 mm (3.6 in)
1983	95.5 mm (3.8 in)
1984	84.3 mm (3.3 in)
1985	72.9 mm (2.9 in)
1986	56.1 mm (2.2 in)
1987	75.4 mm (3.0 in)
1988	104.1 mm (4.1 in)
1989	99.1 mm (3.9 in)
1990	81.5 mm (3.2 in)
1991	158.2 mm (6.2 in)
1992	74.4 mm (2.9 in)
1993	98.3 mm (3.9 in)
1994	65.0 mm (2.6 in)
1995	79.2 mm (3.1 in)
1996	84.3 mm (3.3 in)
1997	114.0 mm (4.5 in)
1998	157.0 mm (6.2 in)
1999	132.3 mm (5.2 in)
2000	121.9 mm (4.8 in)
2001	74.7 mm (2.9 in)
2002	133.9 mm (5.3 in)
2003	114.6 mm (4.5 in)
2004	125.7 mm (4.9 in)
2005	55.9 mm (2.2 in)
2006	72.4 mm (2.9 in)
2007	79.0 mm (3.1 in)
2008	73.2 mm (2.9 in)
2009	113.0 mm (4.4 in)
2010	89.2 mm (3.5 in)
2011	91.7 mm (3.6 in)
2012	51.8 mm (2.0 in)
2013	106.9 mm (4.2 in)
2016	112.0 mm (4.4 in)
2017	88.9 mm (3.5 in)
2018	102.1 mm (4.0 in)
2019	139.7 mm (5.5 in)
2020	137.2 mm (5.4 in)
2021	47.8 mm (1.9 in)
2022	82.0 mm (3.2 in)
2023	104.4 mm (4.1 in)
2024	67.6 mm (2.7 in)
2025	73.7 mm (2.9 in)
2026	78.7 mm (3.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Black Rock, 1892 to 2026. The record is 259.3 mm (10.2 in) in 2016, marked on the chart; the median year is 129.0 mm (5.1 in).

Wettest five days (Rx5day) at Black Rock by year
Year	Wettest five days (Rx5day)
1892	99.6 mm (3.9 in)
1904	61.9 mm (2.4 in)
1905	121.2 mm (4.8 in)
1906	173.5 mm (6.8 in)
1907	196.1 mm (7.7 in)
1908	82.5 mm (3.2 in)
1909	102.6 mm (4.0 in)
1910	117.6 mm (4.6 in)
1911	115.1 mm (4.5 in)
1912	140.4 mm (5.5 in)
1913	159.3 mm (6.3 in)
1914	63.8 mm (2.5 in)
1915	141.5 mm (5.6 in)
1916	106.6 mm (4.2 in)
1917	88.3 mm (3.5 in)
1918	114.6 mm (4.5 in)
1919	164.3 mm (6.5 in)
1920	103.6 mm (4.1 in)
1921	174.3 mm (6.9 in)
1922	87.1 mm (3.4 in)
1923	152.9 mm (6.0 in)
1924	101.4 mm (4.0 in)
1925	127.0 mm (5.0 in)
1926	138.0 mm (5.4 in)
1927	165.8 mm (6.5 in)
1928	134.6 mm (5.3 in)
1929	106.9 mm (4.2 in)
1930	116.8 mm (4.6 in)
1931	127.5 mm (5.0 in)
1932	128.2 mm (5.0 in)
1933	131.7 mm (5.2 in)
1934	145.6 mm (5.7 in)
1935	175.5 mm (6.9 in)
1936	105.3 mm (4.1 in)
1937	128.6 mm (5.1 in)
1938	178.3 mm (7.0 in)
1939	115.3 mm (4.5 in)
1940	94.2 mm (3.7 in)
1941	121.6 mm (4.8 in)
1942	91.7 mm (3.6 in)
1943	124.5 mm (4.9 in)
1944	102.7 mm (4.0 in)
1945	167.4 mm (6.6 in)
1946	119.6 mm (4.7 in)
1947	99.6 mm (3.9 in)
1948	106.0 mm (4.2 in)
1949	160.0 mm (6.3 in)
1950	140.5 mm (5.5 in)
1951	114.9 mm (4.5 in)
1952	135.7 mm (5.3 in)
1953	85.4 mm (3.4 in)
1954	92.0 mm (3.6 in)
1955	90.0 mm (3.5 in)
1956	138.5 mm (5.5 in)
1957	135.9 mm (5.4 in)
1958	113.0 mm (4.4 in)
1959	86.4 mm (3.4 in)
1960	118.0 mm (4.6 in)
1961	162.0 mm (6.4 in)
1962	119.6 mm (4.7 in)
1963	139.2 mm (5.5 in)
1964	136.6 mm (5.4 in)
1965	117.3 mm (4.6 in)
1966	228.6 mm (9.0 in)
1967	82.6 mm (3.3 in)
1968	212.6 mm (8.4 in)
1969	123.0 mm (4.8 in)
1970	129.3 mm (5.1 in)
1971	105.5 mm (4.2 in)
1972	140.5 mm (5.5 in)
1973	181.6 mm (7.1 in)
1974	67.1 mm (2.6 in)
1975	140.7 mm (5.5 in)
1976	109.5 mm (4.3 in)
1977	188.5 mm (7.4 in)
1978	127.3 mm (5.0 in)
1979	174.3 mm (6.9 in)
1980	80.0 mm (3.1 in)
1981	95.1 mm (3.7 in)
1982	195.8 mm (7.7 in)
1983	124.7 mm (4.9 in)
1984	144.5 mm (5.7 in)
1985	110.5 mm (4.4 in)
1986	79.1 mm (3.1 in)
1987	122.9 mm (4.8 in)
1988	144.8 mm (5.7 in)
1989	211.4 mm (8.3 in)
1990	134.4 mm (5.3 in)
1991	184.6 mm (7.3 in)
1992	83.8 mm (3.3 in)
1993	134.6 mm (5.3 in)
1994	95.7 mm (3.8 in)
1995	136.4 mm (5.4 in)
1996	100.8 mm (4.0 in)
1997	150.1 mm (5.9 in)
1998	165.9 mm (6.5 in)
1999	145.3 mm (5.7 in)
2000	150.3 mm (5.9 in)
2001	176.6 mm (7.0 in)
2002	186.5 mm (7.3 in)
2003	258.1 mm (10.2 in)
2004	175.3 mm (6.9 in)
2005	96.2 mm (3.8 in)
2006	115.1 mm (4.5 in)
2007	137.9 mm (5.4 in)
2008	134.5 mm (5.3 in)
2009	164.3 mm (6.5 in)
2010	139.5 mm (5.5 in)
2011	186.6 mm (7.3 in)
2012	95.0 mm (3.7 in)
2013	130.4 mm (5.1 in)
2016	259.3 mm (10.2 in)
2017	207.0 mm (8.1 in)
2018	222.5 mm (8.8 in)
2019	161.1 mm (6.3 in)
2020	180.2 mm (7.1 in)
2021	99.1 mm (3.9 in)
2022	121.8 mm (4.8 in)
2023	134.9 mm (5.3 in)
2024	104.5 mm (4.1 in)
2025	192.4 mm (7.6 in)
2026	113.3 mm (4.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Black Rock, 1892 to 2026. The record is 72 days in 1904, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Black Rock by year
Year	Longest dry spell (CDD)
1892	17 days
1904	72 days
1905	18 days
1906	20 days
1907	18 days
1908	22 days
1909	26 days
1910	20 days
1911	32 days
1912	30 days
1913	26 days
1914	18 days
1915	21 days
1916	26 days
1917	28 days
1918	19 days
1919	20 days
1920	20 days
1921	23 days
1922	16 days
1923	16 days
1924	24 days
1925	21 days
1926	16 days
1927	23 days
1928	16 days
1929	23 days
1930	22 days
1931	17 days
1932	16 days
1933	15 days
1934	23 days
1935	25 days
1936	28 days
1937	27 days
1938	20 days
1939	36 days
1940	26 days
1941	19 days
1942	27 days
1943	27 days
1944	22 days
1945	17 days
1946	19 days
1947	30 days
1948	19 days
1949	21 days
1950	25 days
1951	15 days
1952	23 days
1953	29 days
1954	18 days
1955	27 days
1956	36 days
1957	20 days
1958	22 days
1959	15 days
1960	21 days
1961	28 days
1962	19 days
1963	36 days
1964	20 days
1965	27 days
1966	15 days
1967	19 days
1968	14 days
1969	16 days
1970	16 days
1971	27 days
1972	15 days
1973	16 days
1974	23 days
1975	19 days
1976	22 days
1977	19 days
1978	26 days
1979	18 days
1980	51 days
1981	29 days
1982	17 days
1983	31 days
1984	23 days
1985	18 days
1986	20 days
1987	17 days
1988	20 days
1989	23 days
1990	19 days
1991	15 days
1992	26 days
1993	17 days
1994	15 days
1995	26 days
1996	23 days
1997	16 days
1998	30 days
1999	28 days
2000	23 days
2001	15 days
2002	25 days
2003	24 days
2004	40 days
2005	31 days
2006	25 days
2007	23 days
2008	20 days
2009	25 days
2010	39 days
2011	17 days
2012	36 days
2013	38 days
2016	23 days
2017	19 days
2018	22 days
2019	24 days
2020	19 days
2021	19 days
2022	39 days
2023	22 days
2024	33 days
2025	27 days
2026	19 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

108 years, 1905 to 2025

A day with at least 81.0 mm (3.2 in) of rain is expected about once in 2 years. A day with at least 181.8 mm (7.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Black Rock: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	81.0 mm (3.2 in)
5 years	105.9 mm (4.2 in)
10 years	123.1 mm (4.8 in)
25 years	146.0 mm (5.7 in)
50 years	163.7 mm (6.4 in)
100 years	181.8 mm (7.2 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 108 years of values from 1905 to 2025.

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: 168.7 mm (6.6 in) in 1979; 164.3 mm (6.5 in) in 1966; 158.2 mm (6.2 in) in 1991.

Download the Data

Data for Black Rock standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Black Rock 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 2026-10-14. Last revised 14 October 2026 (2026-10-14).