Onaka Weather Records (USC00396282)

Record envelope, standing records and threshold days for Onaka (USC00396282), South Dakota, United States, with 105 years of record.

Key Facts for Onaka

Onaka (USC00396282) is a weather station in South Dakota, United States at 45.19 latitude and -99.47 longitude, 571 m (1,872 ft) above sea level.
The station reports from 1911 to 2015, 105 years of record.
10 records set at Onaka still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Onaka set a daily record snowfall of 5.1 cm (2.0 in) on 19 January 2015.

About the Station

Location: South Dakota, United States, 45.19 latitude, -99.47 longitude.
Elevation: 571 m (1,872 ft).
Period of record: 1911 to 2015, 105 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 Onaka. 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 Onaka, 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	n/a	n/a	n/a	n/a
Jul	43.3 C (109.9 F)	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	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

10 standing records

10 records at Onaka still stand. 1917 holds the most, with 10.

All-Time Record Progression

6 new records

6 all-time records were set at Onaka between 18 June 1964 and 3 September 1999. Each dot is a new record.

When Onaka set new all-time records
Date	Kind	Detail
1964-06-18	Record daily precipitation	Record daily precipitation 106.7 mm (4.2 in)
1966-06-21	Record daily precipitation	Record daily precipitation 129.5 mm (5.1 in)
1996-12-16	Record snow depth	Record snow depth 78.7 cm (31.0 in)
1996-12-22	Record snow depth	Record snow depth 83.8 cm (33.0 in)
1996-12-23	Record snow depth	Record snow depth 88.9 cm (35.0 in)
1999-09-03	Record daily precipitation	Record daily precipitation 136.1 mm (5.4 in)

Wettest Day of Each Month

Sep: 136.1 mm (5.4 in)

The wettest day on record for each calendar month at Onaka. The most was 136.1 mm (5.4 in) on 3 September 1999.

Record daily precipitation for each month at Onaka
Month	Record daily precipitation (mm)	Date
Jan	22.9 mm (0.9 in)	27 January 1944
Feb	61.0 mm (2.4 in)	14 February 1915
Mar	55.6 mm (2.2 in)	31 March 1981
Apr	72.9 mm (2.9 in)	23 April 1932
May	82.6 mm (3.3 in)	18 May 1921
Jun	129.5 mm (5.1 in)	21 June 1966
Jul	104.6 mm (4.1 in)	7 July 1994
Aug	99.1 mm (3.9 in)	2 August 1911
Sep	136.1 mm (5.4 in)	3 September 1999
Oct	64.5 mm (2.5 in)	17 October 1998
Nov	27.9 mm (1.1 in)	28 November 1960
Dec	88.9 mm (3.5 in)	31 December 1931

Period of Record Coverage

1917 to 1917

1 years of record at Onaka, 1917 to 1917. 1 years have data for under 90 percent of days and are left out of rankings: 1917.

Latest Records

Latest records at Onaka
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
19 January 2015	Onaka, US	daily snowfall	5.1 cm (2.0 in)	1.8 cm (0.7 in)	37 years	25 of 100 (Routine)
22 December 2014	Onaka, US	daily snowfall	12.7 cm (5.0 in)	1.3 cm (0.5 in)	96 years	40 of 100 (Notable)
10 November 2014	Onaka, US	daily snowfall	12.7 cm (5.0 in)	2.5 cm (1.0 in)	95 years	43 of 100 (Notable)
1 January 2014	Onaka, US	daily snowfall (Tie)	5.1 cm (2.0 in)	tie	98 years	9 of 100 (Routine)
14 October 2013	Onaka, US	daily rain	38.6 mm (1.5 in)	5.6 mm (0.22 in)	47 years	29 of 100 (Routine)
8 September 2013	Onaka, US	daily rain	24.4 mm (1.0 in)	3.6 mm (0.14 in)	44 years	20 of 100 (Routine)
16 April 2013	Onaka, US	daily snowfall	7.6 cm (3.0 in)	2.5 cm (1.0 in)	12 years	16 of 100 (Routine)
14 April 2013	Onaka, US	monthly snowfall	35.6 cm (14.0 in)	2.6 cm (1.0 in)	5 years	24 of 100 (Routine)
14 April 2013	Onaka, US	daily rain	20.3 mm (0.8 in)	1.8 mm (0.07 in)	0 years	12 of 100 (Routine)
9 April 2013	Onaka, US	daily snowfall (Tie)	10.2 cm (4.0 in)	tie	18 years	3 of 100 (Routine)
9 February 2013	Onaka, US	daily snowfall	25.4 cm (10.0 in)	19.0 cm (7.5 in)	47 years	56 of 100 (Notable)
9 February 2013	Onaka, US	daily rain (Tie)	20.1 mm (0.8 in)	tie	4 years	2 of 100 (Routine)
28 January 2013	Onaka, US	daily snowfall	21.6 cm (8.5 in)	12.7 cm (5.0 in)	17 years	44 of 100 (Notable)
28 January 2013	Onaka, US	daily rain	16.8 mm (0.7 in)	8.4 mm (0.33 in)	17 years	20 of 100 (Routine)
9 December 2012	Onaka, US	daily snowfall	4.6 cm (1.8 in)	1.8 cm (0.7 in)	94 years	20 of 100 (Routine)
8 December 2012	Onaka, US	daily snowfall	8.1 cm (3.2 in)	4.3 cm (1.7 in)	41 years	31 of 100 (Routine)
8 December 2012	Onaka, US	daily rain	4.1 mm (0.16 in)	0.3 mm (0.01 in)	41 years	20 of 100 (Routine)
14 April 2012	Onaka, US	daily rain	18.5 mm (0.7 in)	6.6 mm (0.26 in)	100 years	20 of 100 (Routine)
5 December 2011	Onaka, US	daily snowfall	10.2 cm (4.0 in)	6.4 cm (2.5 in)	80 years	47 of 100 (Notable)
5 December 2011	Onaka, US	daily rain	4.6 mm (0.18 in)	1.3 mm (0.05 in)	41 years	20 of 100 (Routine)

Extremes by Year

1911 to 2015

Yearly extremes at Onaka: 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)	1917	43.3 C (109.9 F)	1
Wettest day (Rx1day)	136.1 mm (5.4 in)	1999	48.3 mm (1.9 in)	105
Wettest five days (Rx5day)	187.9 mm (7.4 in)	1999	71.9 mm (2.8 in)	105
Longest dry spell (CDD)	82 days	1981	38 days	105

Hottest day (TXx)

The hottest day of the year at Onaka, 1911 to 2015. The record is 43.3 C (109.9 F) in 1917, marked on the chart; the median year is 43.3 C (109.9 F).

Hottest day (TXx) at Onaka by year
Year	Hottest day (TXx)
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	43.3 C (109.9 F)
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	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
2014	n/a
2015	n/a

Wettest day (Rx1day)

The wettest day of the year at Onaka, 1911 to 2015. The record is 136.1 mm (5.4 in) in 1999, marked on the chart; the median year is 48.3 mm (1.9 in).

Wettest day (Rx1day) at Onaka by year
Year	Wettest day (Rx1day)
1911	99.1 mm (3.9 in)
1912	30.5 mm (1.2 in)
1913	40.6 mm (1.6 in)
1914	57.2 mm (2.3 in)
1915	105.4 mm (4.1 in)
1916	55.9 mm (2.2 in)
1917	21.3 mm (0.8 in)
1918	44.5 mm (1.8 in)
1919	48.3 mm (1.9 in)
1920	40.6 mm (1.6 in)
1921	82.6 mm (3.3 in)
1922	54.6 mm (2.1 in)
1923	33.0 mm (1.3 in)
1924	30.5 mm (1.2 in)
1925	61.0 mm (2.4 in)
1926	38.1 mm (1.5 in)
1927	61.7 mm (2.4 in)
1928	98.3 mm (3.9 in)
1929	33.0 mm (1.3 in)
1930	78.7 mm (3.1 in)
1931	88.9 mm (3.5 in)
1932	72.9 mm (2.9 in)
1933	21.6 mm (0.9 in)
1934	23.6 mm (0.9 in)
1935	80.8 mm (3.2 in)
1936	65.0 mm (2.6 in)
1937	73.9 mm (2.9 in)
1938	52.1 mm (2.1 in)
1939	44.5 mm (1.8 in)
1940	24.4 mm (1.0 in)
1941	63.5 mm (2.5 in)
1942	42.7 mm (1.7 in)
1943	39.6 mm (1.6 in)
1944	73.7 mm (2.9 in)
1945	33.0 mm (1.3 in)
1946	45.5 mm (1.8 in)
1947	79.2 mm (3.1 in)
1948	37.6 mm (1.5 in)
1949	52.3 mm (2.1 in)
1950	24.9 mm (1.0 in)
1951	38.6 mm (1.5 in)
1952	57.7 mm (2.3 in)
1953	57.2 mm (2.3 in)
1954	42.2 mm (1.7 in)
1955	42.4 mm (1.7 in)
1956	54.9 mm (2.2 in)
1957	46.2 mm (1.8 in)
1958	31.2 mm (1.2 in)
1959	46.2 mm (1.8 in)
1960	77.5 mm (3.1 in)
1961	46.0 mm (1.8 in)
1962	53.1 mm (2.1 in)
1963	66.0 mm (2.6 in)
1964	106.7 mm (4.2 in)
1965	27.9 mm (1.1 in)
1966	129.5 mm (5.1 in)
1967	62.7 mm (2.5 in)
1968	36.6 mm (1.4 in)
1969	107.7 mm (4.2 in)
1970	28.2 mm (1.1 in)
1971	67.3 mm (2.6 in)
1972	76.2 mm (3.0 in)
1973	44.7 mm (1.8 in)
1974	54.1 mm (2.1 in)
1975	43.2 mm (1.7 in)
1976	19.1 mm (0.8 in)
1977	35.1 mm (1.4 in)
1978	67.8 mm (2.7 in)
1979	40.6 mm (1.6 in)
1980	55.9 mm (2.2 in)
1981	55.6 mm (2.2 in)
1982	47.8 mm (1.9 in)
1983	39.6 mm (1.6 in)
1984	81.8 mm (3.2 in)
1985	41.9 mm (1.6 in)
1986	51.1 mm (2.0 in)
1987	33.5 mm (1.3 in)
1988	19.1 mm (0.8 in)
1989	65.8 mm (2.6 in)
1990	66.0 mm (2.6 in)
1991	81.3 mm (3.2 in)
1992	45.2 mm (1.8 in)
1993	49.5 mm (1.9 in)
1994	104.6 mm (4.1 in)
1995	38.1 mm (1.5 in)
1996	59.7 mm (2.4 in)
1997	42.4 mm (1.7 in)
1998	71.4 mm (2.8 in)
1999	136.1 mm (5.4 in)
2000	34.3 mm (1.4 in)
2001	41.1 mm (1.6 in)
2002	49.5 mm (1.9 in)
2003	78.7 mm (3.1 in)
2004	41.7 mm (1.6 in)
2005	36.6 mm (1.4 in)
2006	37.6 mm (1.5 in)
2007	57.7 mm (2.3 in)
2008	57.2 mm (2.3 in)
2009	49.0 mm (1.9 in)
2010	26.2 mm (1.0 in)
2011	61.0 mm (2.4 in)
2012	23.4 mm (0.9 in)
2013	46.5 mm (1.8 in)
2014	24.9 mm (1.0 in)
2015	3.3 mm (0.13 in)

Wettest five days (Rx5day)

The wettest five days of the year at Onaka, 1911 to 2015. The record is 187.9 mm (7.4 in) in 1999, marked on the chart; the median year is 71.9 mm (2.8 in).

Wettest five days (Rx5day) at Onaka by year
Year	Wettest five days (Rx5day)
1911	42.7 mm (1.7 in)
1912	47.0 mm (1.9 in)
1913	52.3 mm (2.1 in)
1914	77.5 mm (3.1 in)
1915	133.6 mm (5.3 in)
1916	87.4 mm (3.4 in)
1917	37.8 mm (1.5 in)
1918	82.8 mm (3.3 in)
1919	61.0 mm (2.4 in)
1920	63.5 mm (2.5 in)
1921	110.5 mm (4.4 in)
1922	63.5 mm (2.5 in)
1923	75.4 mm (3.0 in)
1924	32.5 mm (1.3 in)
1925	69.9 mm (2.8 in)
1926	66.5 mm (2.6 in)
1927	90.6 mm (3.6 in)
1928	121.2 mm (4.8 in)
1929	48.3 mm (1.9 in)
1930	104.1 mm (4.1 in)
1931	88.9 mm (3.5 in)
1932	105.7 mm (4.2 in)
1933	23.6 mm (0.9 in)
1934	34.3 mm (1.4 in)
1935	97.6 mm (3.8 in)
1936	71.1 mm (2.8 in)
1937	74.9 mm (2.9 in)
1938	62.8 mm (2.5 in)
1939	47.8 mm (1.9 in)
1940	36.6 mm (1.4 in)
1941	68.4 mm (2.7 in)
1942	76.2 mm (3.0 in)
1943	85.9 mm (3.4 in)
1944	92.2 mm (3.6 in)
1945	50.9 mm (2.0 in)
1946	62.0 mm (2.4 in)
1947	87.4 mm (3.4 in)
1948	65.3 mm (2.6 in)
1949	62.7 mm (2.5 in)
1950	34.3 mm (1.4 in)
1951	69.7 mm (2.7 in)
1952	69.9 mm (2.8 in)
1953	76.2 mm (3.0 in)
1954	83.1 mm (3.3 in)
1955	47.6 mm (1.9 in)
1956	63.6 mm (2.5 in)
1957	79.0 mm (3.1 in)
1958	45.0 mm (1.8 in)
1959	92.2 mm (3.6 in)
1960	78.6 mm (3.1 in)
1961	85.9 mm (3.4 in)
1962	112.3 mm (4.4 in)
1963	110.9 mm (4.4 in)
1964	163.3 mm (6.4 in)
1965	43.9 mm (1.7 in)
1966	164.6 mm (6.5 in)
1967	88.6 mm (3.5 in)
1968	74.0 mm (2.9 in)
1969	108.5 mm (4.3 in)
1970	60.7 mm (2.4 in)
1971	69.1 mm (2.7 in)
1972	83.6 mm (3.3 in)
1973	81.8 mm (3.2 in)
1974	67.3 mm (2.6 in)
1975	50.8 mm (2.0 in)
1976	19.1 mm (0.8 in)
1977	47.0 mm (1.9 in)
1978	76.9 mm (3.0 in)
1979	84.1 mm (3.3 in)
1980	63.2 mm (2.5 in)
1981	71.9 mm (2.8 in)
1982	102.9 mm (4.1 in)
1983	103.6 mm (4.1 in)
1984	114.3 mm (4.5 in)
1985	81.5 mm (3.2 in)
1986	87.2 mm (3.4 in)
1987	77.7 mm (3.1 in)
1988	29.5 mm (1.2 in)
1989	83.5 mm (3.3 in)
1990	70.7 mm (2.8 in)
1991	108.7 mm (4.3 in)
1992	71.9 mm (2.8 in)
1993	62.2 mm (2.4 in)
1994	114.5 mm (4.5 in)
1995	64.3 mm (2.5 in)
1996	115.4 mm (4.5 in)
1997	55.2 mm (2.2 in)
1998	106.5 mm (4.2 in)
1999	187.9 mm (7.4 in)
2000	41.2 mm (1.6 in)
2001	62.5 mm (2.5 in)
2002	72.1 mm (2.8 in)
2003	100.5 mm (4.0 in)
2004	58.6 mm (2.3 in)
2005	42.2 mm (1.7 in)
2006	58.5 mm (2.3 in)
2007	77.3 mm (3.0 in)
2008	83.4 mm (3.3 in)
2009	72.9 mm (2.9 in)
2010	41.6 mm (1.6 in)
2011	114.3 mm (4.5 in)
2012	41.9 mm (1.6 in)
2013	71.4 mm (2.8 in)
2014	50.8 mm (2.0 in)
2015	3.3 mm (0.13 in)

Longest dry spell (CDD)

The longest dry spell of the year at Onaka, 1911 to 2015. The record is 82 days in 1981, marked on the chart; the median year is 38 days.

Longest dry spell (CDD) at Onaka by year
Year	Longest dry spell (CDD)
1911	27 days
1912	68 days
1913	27 days
1914	45 days
1915	25 days
1916	25 days
1917	63 days
1918	31 days
1919	49 days
1920	40 days
1921	35 days
1922	52 days
1923	44 days
1924	33 days
1925	64 days
1926	30 days
1927	27 days
1928	46 days
1929	19 days
1930	23 days
1931	41 days
1932	37 days
1933	41 days
1934	80 days
1935	38 days
1936	43 days
1937	59 days
1938	60 days
1939	73 days
1940	56 days
1941	63 days
1942	53 days
1943	38 days
1944	34 days
1945	81 days
1946	35 days
1947	49 days
1948	37 days
1949	29 days
1950	40 days
1951	36 days
1952	75 days
1953	25 days
1954	30 days
1955	43 days
1956	41 days
1957	24 days
1958	39 days
1959	29 days
1960	46 days
1961	59 days
1962	25 days
1963	33 days
1964	58 days
1965	47 days
1966	24 days
1967	33 days
1968	66 days
1969	21 days
1970	30 days
1971	35 days
1972	34 days
1973	33 days
1974	38 days
1975	34 days
1976	34 days
1977	27 days
1978	40 days
1979	61 days
1980	50 days
1981	82 days
1982	35 days
1983	41 days
1984	43 days
1985	50 days
1986	42 days
1987	74 days
1988	72 days
1989	34 days
1990	47 days
1991	48 days
1992	37 days
1993	29 days
1994	28 days
1995	46 days
1996	29 days
1997	31 days
1998	36 days
1999	74 days
2000	27 days
2001	44 days
2002	53 days
2003	33 days
2004	54 days
2005	39 days
2006	48 days
2007	42 days
2008	21 days
2009	31 days
2010	23 days
2011	24 days
2012	43 days
2013	27 days
2014	26 days
2015	38 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

89 years, 1912 to 2012

A day with at least 49.7 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 133.0 mm (5.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Onaka: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	49.7 mm (2.0 in)
5 years	70.5 mm (2.8 in)
10 years	84.8 mm (3.3 in)
25 years	103.7 mm (4.1 in)
50 years	118.1 mm (4.6 in)
100 years	133.0 mm (5.2 in)	Longer than the 89 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, 89 years of values from 1912 to 2012.

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: 136.1 mm (5.4 in) in 1999; 129.5 mm (5.1 in) in 1966; 107.7 mm (4.2 in) in 1969.

Download the Data

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