Ashton Weather Records (USC00390346)

Record envelope, standing records and threshold days for Ashton (USC00390346), South Dakota, United States, with 45 years of record.

Key Facts for Ashton

Ashton (USC00390346) is a weather station in South Dakota, United States at 45.00 latitude and -98.48 longitude, 379 m (1,244 ft) above sea level.
The station reports from 1924 to 1968, 45 years of record.
478 records set at Ashton still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
Ashton set a daily record precipitation of 34.3 mm (1.4 in) on 22 April 1968.

About the Station

Location: South Dakota, United States, 45.00 latitude, -98.48 longitude.
Elevation: 379 m (1,244 ft).
Period of record: 1924 to 1968, 45 years.
Eligible elements: prcp, snow.

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 Ashton. 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 Ashton, 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	26.7 C (80.1 F)	-16.7 C (1.9 F)	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)	6.7 C (44.1 F)	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	24.4 C (75.9 F)	-21.1 C (-6.0 F)	n/a	n/a
Nov	20.0 C (68.0 F)	-12.2 C (10.0 F)	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

478 standing records

478 records at Ashton still stand. 1933 holds the most, with 124.

All-Time Record Progression

1 new records

1 all-time records were set at Ashton between 13 July 1966 and 13 July 1966. Each dot is a new record.

Wettest Day of Each Month

Jul: 108.7 mm (4.3 in)

The wettest day on record for each calendar month at Ashton. The most was 108.7 mm (4.3 in) on 13 July 1966.

Record daily precipitation for each month at Ashton
Month	Record daily precipitation (mm)	Date
Jan	53.8 mm (2.1 in)	9 January 1939
Feb	41.1 mm (1.6 in)	27 February 1958
Mar	33.3 mm (1.3 in)	23 March 1937
Apr	49.5 mm (1.9 in)	19 April 1957
May	59.7 mm (2.4 in)	3 May 1964
Jun	85.9 mm (3.4 in)	28 June 1952
Jul	108.7 mm (4.3 in)	13 July 1966
Aug	84.3 mm (3.3 in)	20 August 1966
Sep	57.7 mm (2.3 in)	7 September 1930
Oct	65.5 mm (2.6 in)	11 October 1961
Nov	35.6 mm (1.4 in)	20 November 1930
Dec	38.9 mm (1.5 in)	30 December 1931

Period of Record Coverage

1928 to 1934

4 years of record at Ashton, 1928 to 1934. 4 years have data for under 90 percent of days and are left out of rankings: 1928, 1932, 1933, 1934.

Latest Records

Latest records at Ashton
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
22 April 1968	Ashton, US	daily rain	34.3 mm (1.4 in)	18.8 mm (0.7 in)	5 years	26 of 100 (Routine)
20 April 1968	Ashton, US	daily rain	37.8 mm (1.5 in)	8.3 mm (0.33 in)	11 years	16 of 100 (Routine)
7 April 1968	Ashton, US	daily rain	19.6 mm (0.8 in)	5.1 mm (0.20 in)	41 years	20 of 100 (Routine)
7 October 1967	Ashton, US	daily rain	10.7 mm (0.4 in)	2.1 mm (0.08 in)	26 years	13 of 100 (Routine)
6 October 1967	Ashton, US	daily rain	11.9 mm (0.5 in)	8.6 mm (0.34 in)	4 years	12 of 100 (Routine)
20 September 1967	Ashton, US	daily rain	10.2 mm (0.4 in)	3.6 mm (0.14 in)	38 years	19 of 100 (Routine)
18 September 1967	Ashton, US	daily rain	34.8 mm (1.4 in)	6.4 mm (0.25 in)	9 years	13 of 100 (Routine)
18 June 1967	Ashton, US	daily rain	14.5 mm (0.6 in)	8.1 mm (0.32 in)	4 years	11 of 100 (Routine)
14 June 1967	Ashton, US	daily rain	26.7 mm (1.1 in)	0.5 mm (0.02 in)	32 years	13 of 100 (Routine)
17 February 1967	Ashton, US	daily rain	10.7 mm (0.4 in)	3.8 mm (0.15 in)	4 years	12 of 100 (Routine)
17 February 1967	Ashton, US	daily snowfall	10.2 cm (4.0 in)	2.6 cm (1.0 in)	4 years	10 of 100 (Routine)
15 February 1967	Ashton, US	daily snowfall (Tie)	15.2 cm (6.0 in)	tie	28 years	3 of 100 (Routine)
6 January 1967	Ashton, US	daily rain (Tie)	4.6 mm (0.18 in)	tie	29 years	3 of 100 (Routine)
26 November 1966	Ashton, US	daily rain	8.6 mm (0.34 in)	5.0 mm (0.20 in)	12 years	15 of 100 (Routine)
9 November 1966	Ashton, US	daily rain	6.1 mm (0.24 in)	4.1 mm (0.16 in)	37 years	20 of 100 (Routine)
14 October 1966	Ashton, US	daily rain	50.8 mm (2.0 in)	46.0 mm (1.8 in)	8 years	46 of 100 (Notable)
28 September 1966	Ashton, US	daily rain (Tie)	1.0 mm (0.04 in)	tie	36 years	3 of 100 (Routine)
20 August 1966	Ashton, US	monthly rain	84.3 mm (3.3 in)	33.2 mm (1.3 in)	15 years	50 of 100 (Notable)
13 July 1966	Ashton, US	all-time rain	108.7 mm (4.3 in)	22.8 mm (0.9 in)	14 years	50 of 100 (Notable)
22 June 1966	Ashton, US	daily rain	38.9 mm (1.5 in)	15.0 mm (0.6 in)	1 year	15 of 100 (Routine)

Extremes by Year

1924 to 1968

Yearly extremes at Ashton: 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)	1933	25.5 C (78.0 F)	4
Coldest night (TNn)	-21.1 C (-6.0 F)	1925	-13.3 C (8.1 F)	5
Wettest day (Rx1day)	108.7 mm (4.3 in)	1966	45.8 mm (1.8 in)	40
Wettest five days (Rx5day)	135.7 mm (5.3 in)	1952	61.4 mm (2.4 in)	40
Longest dry spell (CDD)	71 days	1942	36 days	40

Hottest day (TXx)

The hottest day of the year at Ashton, 1924 to 1968. The record is 43.3 C (109.9 F) in 1933, marked on the chart; the median year is 25.5 C (78.0 F).

Hottest day (TXx) at Ashton by year
Year	Hottest day (TXx)
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	26.7 C (80.1 F)
1929	n/a
1930	n/a
1931	n/a
1932	24.4 C (75.9 F)
1933	43.3 C (109.9 F)
1934	20.0 C (68.0 F)
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
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

Coldest night (TNn)

The coldest night of the year at Ashton, 1924 to 1968. The record is -21.1 C (-6.0 F) in 1925, marked on the chart; the median year is -13.3 C (8.1 F).

Coldest night (TNn) at Ashton by year
Year	Coldest night (TNn)
1924	n/a
1925	-21.1 C (-6.0 F)
1926	n/a
1927	n/a
1928	-16.7 C (1.9 F)
1929	n/a
1930	n/a
1931	n/a
1932	-13.3 C (8.1 F)
1933	6.7 C (44.1 F)
1934	-12.2 C (10.0 F)
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
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

Wettest day (Rx1day)

The wettest day of the year at Ashton, 1924 to 1968. The record is 108.7 mm (4.3 in) in 1966, marked on the chart; the median year is 45.8 mm (1.8 in).

Wettest day (Rx1day) at Ashton by year
Year	Wettest day (Rx1day)
1924	49.0 mm (1.9 in)
1925	47.0 mm (1.9 in)
1926	35.8 mm (1.4 in)
1927	31.8 mm (1.3 in)
1928	38.6 mm (1.5 in)
1929	43.9 mm (1.7 in)
1930	57.7 mm (2.3 in)
1931	57.7 mm (2.3 in)
1932	50.5 mm (2.0 in)
1933	37.3 mm (1.5 in)
1934	38.9 mm (1.5 in)
1935	78.7 mm (3.1 in)
1936	34.3 mm (1.4 in)
1937	33.3 mm (1.3 in)
1938	34.5 mm (1.4 in)
1939	66.8 mm (2.6 in)
1940	54.4 mm (2.1 in)
1941	49.8 mm (2.0 in)
1942	43.9 mm (1.7 in)
1943	30.5 mm (1.2 in)
1944	44.5 mm (1.8 in)
1945	48.3 mm (1.9 in)
1951	71.9 mm (2.8 in)
1952	85.9 mm (3.4 in)
1953	81.0 mm (3.2 in)
1954	67.6 mm (2.7 in)
1955	41.9 mm (1.6 in)
1956	50.5 mm (2.0 in)
1957	49.5 mm (1.9 in)
1958	41.1 mm (1.6 in)
1959	33.5 mm (1.3 in)
1960	41.7 mm (1.6 in)
1961	65.5 mm (2.6 in)
1962	55.4 mm (2.2 in)
1963	23.6 mm (0.9 in)
1964	59.7 mm (2.4 in)
1965	40.6 mm (1.6 in)
1966	108.7 mm (4.3 in)
1967	34.8 mm (1.4 in)
1968	38.4 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ashton, 1924 to 1968. The record is 135.7 mm (5.3 in) in 1952, marked on the chart; the median year is 61.4 mm (2.4 in).

Wettest five days (Rx5day) at Ashton by year
Year	Wettest five days (Rx5day)
1924	53.6 mm (2.1 in)
1925	78.0 mm (3.1 in)
1926	52.3 mm (2.1 in)
1927	59.9 mm (2.4 in)
1928	46.5 mm (1.8 in)
1929	45.9 mm (1.8 in)
1930	70.8 mm (2.8 in)
1931	57.7 mm (2.3 in)
1932	55.6 mm (2.2 in)
1933	37.3 mm (1.5 in)
1934	47.5 mm (1.9 in)
1935	103.0 mm (4.1 in)
1936	34.3 mm (1.4 in)
1937	42.2 mm (1.7 in)
1938	52.7 mm (2.1 in)
1939	68.6 mm (2.7 in)
1940	57.2 mm (2.3 in)
1941	67.1 mm (2.6 in)
1942	67.5 mm (2.7 in)
1943	57.2 mm (2.3 in)
1944	53.4 mm (2.1 in)
1945	77.5 mm (3.1 in)
1951	106.2 mm (4.2 in)
1952	135.7 mm (5.3 in)
1953	132.8 mm (5.2 in)
1954	74.7 mm (2.9 in)
1955	61.8 mm (2.4 in)
1956	78.0 mm (3.1 in)
1957	90.4 mm (3.6 in)
1958	56.3 mm (2.2 in)
1959	46.7 mm (1.8 in)
1960	60.9 mm (2.4 in)
1961	88.6 mm (3.5 in)
1962	83.0 mm (3.3 in)
1963	37.3 mm (1.5 in)
1964	60.8 mm (2.4 in)
1965	73.8 mm (2.9 in)
1966	110.5 mm (4.4 in)
1967	62.2 mm (2.4 in)
1968	112.3 mm (4.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ashton, 1924 to 1968. The record is 71 days in 1942, marked on the chart; the median year is 36 days.

Longest dry spell (CDD) at Ashton by year
Year	Longest dry spell (CDD)
1924	38 days
1925	29 days
1926	38 days
1927	17 days
1928	36 days
1929	24 days
1930	31 days
1931	21 days
1932	25 days
1933	46 days
1934	58 days
1935	30 days
1936	28 days
1937	33 days
1938	38 days
1939	70 days
1940	47 days
1941	51 days
1942	71 days
1943	56 days
1944	34 days
1945	31 days
1951	33 days
1952	56 days
1953	29 days
1954	27 days
1955	47 days
1956	41 days
1957	24 days
1958	44 days
1959	42 days
1960	31 days
1961	39 days
1962	46 days
1963	28 days
1964	33 days
1965	37 days
1966	35 days
1967	39 days
1968	17 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

30 years, 1929 to 1966

A day with at least 48.3 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 118.8 mm (4.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Ashton: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	48.3 mm (1.9 in)
5 years	64.8 mm (2.6 in)
10 years	76.7 mm (3.0 in)
25 years	92.7 mm (3.6 in)
50 years	105.4 mm (4.1 in)	Longer than the 30 years of record
100 years	118.8 mm (4.7 in)	Longer than the 30 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, 30 years of values from 1929 to 1966.

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: 108.7 mm (4.3 in) in 1966; 85.9 mm (3.4 in) in 1952; 81.0 mm (3.2 in) in 1953.

Download the Data

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