Riverton Weather Records (USC00216972)

Record envelope, standing records and threshold days for Riverton (USC00216972), Minnesota, United States, with 42 years of record.

Key Facts for Riverton

Riverton (USC00216972) is a weather station in Minnesota, United States at 46.47 latitude and -94.05 longitude, 354 m (1,161 ft) above sea level.
The station reports from 1948 to 1989, 42 years of record.
1,298 records set at Riverton still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Riverton set a daily record precipitation of 33.5 mm (1.3 in) on 21 September 1989.

About the Station

Location: Minnesota, United States, 46.47 latitude, -94.05 longitude.
Elevation: 354 m (1,161 ft).
Period of record: 1948 to 1989, 42 years.
Eligible elements: prcp.

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 Riverton. 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 Riverton, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	11.1 C (52.0 F)	-41.7 C (-43.1 F)	n/a	n/a
Feb	8.9 C (48.0 F)	-36.1 C (-33.0 F)	n/a	n/a
Mar	10.6 C (51.1 F)	-27.2 C (-17.0 F)	n/a	n/a
Apr	26.7 C (80.1 F)	-17.2 C (1.0 F)	n/a	n/a
May	28.9 C (84.0 F)	-1.7 C (28.9 F)	n/a	n/a
Jun	33.9 C (93.0 F)	3.9 C (39.0 F)	n/a	n/a
Jul	32.8 C (91.0 F)	7.8 C (46.0 F)	n/a	n/a
Aug	33.9 C (93.0 F)	7.2 C (45.0 F)	n/a	n/a
Sep	28.9 C (84.0 F)	0.0 C (32.0 F)	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	14.4 C (57.9 F)	-13.3 C (8.1 F)	n/a	n/a
Dec	10.6 C (51.1 F)	-35.6 C (-32.1 F)	n/a	n/a

Which Years Hold Standing Records

1,298 standing records

1,298 records at Riverton still stand. 1973 holds the most, with 431.

Wettest Day of Each Month

Jul: 149.4 mm (5.9 in)

The wettest day on record for each calendar month at Riverton. The most was 149.4 mm (5.9 in) on 18 July 1952.

Record daily precipitation for each month at Riverton
Month	Record daily precipitation (mm)	Date
Jan	20.8 mm (0.8 in)	15 January 1952
Feb	38.1 mm (1.5 in)	27 February 1971
Mar	33.0 mm (1.3 in)	2 March 1965
Apr	53.3 mm (2.1 in)	24 April 1960
May	81.0 mm (3.2 in)	23 May 1962
Jun	68.3 mm (2.7 in)	29 June 1975
Jul	149.4 mm (5.9 in)	18 July 1952
Aug	72.6 mm (2.9 in)	6 August 1965
Sep	67.1 mm (2.6 in)	7 September 1964
Oct	58.7 mm (2.3 in)	10 October 1973
Nov	44.2 mm (1.7 in)	1 November 1974
Dec	22.9 mm (0.9 in)	13 December 1968

Period of Record Coverage

1968 to 1978

9 years of record at Riverton, 1968 to 1978. 9 years have data for under 90 percent of days and are left out of rankings: 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975 and others.

Latest Records

Latest records at Riverton
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1989	Riverton, US	daily rain	33.5 mm (1.3 in)	13.9 mm (0.5 in)	3 years	18 of 100 (Routine)
4 September 1989	Riverton, US	daily rain	31.0 mm (1.2 in)	9.2 mm (0.36 in)	18 years	18 of 100 (Routine)
31 August 1989	Riverton, US	daily rain	49.5 mm (1.9 in)	30.4 mm (1.2 in)	36 years	38 of 100 (Notable)
22 June 1989	Riverton, US	daily rain	45.0 mm (1.8 in)	21.4 mm (0.8 in)	3 years	21 of 100 (Routine)
30 April 1989	Riverton, US	daily rain	13.0 mm (0.5 in)	1.8 mm (0.07 in)	38 years	17 of 100 (Routine)
2 April 1989	Riverton, US	daily rain	5.8 mm (0.23 in)	0.2 mm (0.01 in)	26 years	11 of 100 (Routine)
13 February 1989	Riverton, US	daily rain	3.8 mm (0.15 in)	2.8 mm (0.11 in)	40 years	20 of 100 (Routine)
1 February 1989	Riverton, US	daily rain	3.8 mm (0.15 in)	0.5 mm (0.02 in)	24 years	12 of 100 (Routine)
14 December 1988	Riverton, US	daily rain	9.4 mm (0.37 in)	1.5 mm (0.06 in)	5 years	8 of 100 (Routine)
27 November 1988	Riverton, US	daily rain	21.6 mm (0.9 in)	7.9 mm (0.31 in)	22 years	20 of 100 (Routine)
16 November 1988	Riverton, US	daily rain	18.0 mm (0.7 in)	7.3 mm (0.29 in)	1 year	15 of 100 (Routine)
29 September 1988	Riverton, US	daily rain	24.1 mm (0.9 in)	7.8 mm (0.31 in)	34 years	20 of 100 (Routine)
14 August 1988	Riverton, US	daily rain	49.5 mm (1.9 in)	8.4 mm (0.33 in)	17 years	15 of 100 (Routine)
13 August 1988	Riverton, US	daily rain	51.3 mm (2.0 in)	14.2 mm (0.6 in)	31 years	24 of 100 (Routine)
27 May 1988	Riverton, US	daily rain	25.9 mm (1.0 in)	8.1 mm (0.32 in)	33 years	20 of 100 (Routine)
9 May 1988	Riverton, US	daily rain (Tie)	22.1 mm (0.9 in)	tie	10 years	1 of 100 (Routine)
25 March 1988	Riverton, US	daily rain	17.5 mm (0.7 in)	4.0 mm (0.16 in)	34 years	20 of 100 (Routine)
8 March 1988	Riverton, US	daily rain	15.5 mm (0.6 in)	5.6 mm (0.22 in)	6 years	15 of 100 (Routine)
20 January 1988	Riverton, US	daily rain	9.7 mm (0.38 in)	1.3 mm (0.05 in)	37 years	18 of 100 (Routine)
19 January 1988	Riverton, US	daily rain	3.3 mm (0.13 in)	1.0 mm (0.04 in)	36 years	17 of 100 (Routine)

Extremes by Year

1948 to 1989

Yearly extremes at Riverton: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.9 C (93.0 F)	1968	32.2 C (90.0 F)	9
Coldest night (TNn)	-41.7 C (-43.1 F)	1972	-35.6 C (-32.1 F)	9
Wettest day (Rx1day)	149.4 mm (5.9 in)	1952	53.1 mm (2.1 in)	40
Wettest five days (Rx5day)	294.1 mm (11.6 in)	1952	87.4 mm (3.4 in)	39
Longest dry spell (CDD)	42 days	1988	23 days	39

Hottest day (TXx)

The hottest day of the year at Riverton, 1948 to 1989. The record is 33.9 C (93.0 F) in 1968, marked on the chart; the median year is 32.2 C (90.0 F).

Hottest day (TXx) at Riverton by year
Year	Hottest day (TXx)
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	33.9 C (93.0 F)
1969	10.6 C (51.1 F)
1970	26.7 C (80.1 F)
1971	32.2 C (90.0 F)
1972	33.9 C (93.0 F)
1973	33.3 C (91.9 F)
1974	32.2 C (90.0 F)
1975	31.1 C (88.0 F)
1976	n/a
1978	-0.6 C (30.9 F)
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

Coldest night (TNn)

The coldest night of the year at Riverton, 1948 to 1989. The record is -41.7 C (-43.1 F) in 1972, marked on the chart; the median year is -35.6 C (-32.1 F).

Coldest night (TNn) at Riverton by year
Year	Coldest night (TNn)
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	-36.1 C (-33.0 F)
1969	-23.9 C (-11.0 F)
1970	-38.9 C (-38.0 F)
1971	-12.2 C (10.0 F)
1972	-41.7 C (-43.1 F)
1973	-33.9 C (-29.0 F)
1974	-35.6 C (-32.1 F)
1975	-30.0 C (-22.0 F)
1976	n/a
1978	-35.6 C (-32.1 F)
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

Wettest day (Rx1day)

The wettest day of the year at Riverton, 1948 to 1989. The record is 149.4 mm (5.9 in) in 1952, marked on the chart; the median year is 53.1 mm (2.1 in).

Wettest day (Rx1day) at Riverton by year
Year	Wettest day (Rx1day)
1948	46.5 mm (1.8 in)
1949	54.6 mm (2.1 in)
1950	34.3 mm (1.4 in)
1951	54.9 mm (2.2 in)
1952	149.4 mm (5.9 in)
1953	67.1 mm (2.6 in)
1954	73.2 mm (2.9 in)
1955	91.7 mm (3.6 in)
1956	38.6 mm (1.5 in)
1957	51.3 mm (2.0 in)
1958	54.6 mm (2.1 in)
1959	80.8 mm (3.2 in)
1960	59.7 mm (2.4 in)
1961	40.6 mm (1.6 in)
1962	81.0 mm (3.2 in)
1963	77.5 mm (3.1 in)
1964	67.3 mm (2.6 in)
1965	72.6 mm (2.9 in)
1966	87.6 mm (3.4 in)
1967	34.8 mm (1.4 in)
1968	56.4 mm (2.2 in)
1969	45.7 mm (1.8 in)
1970	29.7 mm (1.2 in)
1971	51.6 mm (2.0 in)
1972	51.6 mm (2.0 in)
1973	58.7 mm (2.3 in)
1974	44.2 mm (1.7 in)
1975	68.3 mm (2.7 in)
1976	41.9 mm (1.6 in)
1978	66.5 mm (2.6 in)
1980	2.5 mm (0.10 in)
1981	43.7 mm (1.7 in)
1982	41.1 mm (1.6 in)
1983	32.0 mm (1.3 in)
1984	51.6 mm (2.0 in)
1985	64.8 mm (2.6 in)
1986	58.9 mm (2.3 in)
1987	38.1 mm (1.5 in)
1988	51.3 mm (2.0 in)
1989	49.5 mm (1.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Riverton, 1948 to 1989. The record is 294.1 mm (11.6 in) in 1952, marked on the chart; the median year is 87.4 mm (3.4 in).

Wettest five days (Rx5day) at Riverton by year
Year	Wettest five days (Rx5day)
1948	48.0 mm (1.9 in)
1949	90.4 mm (3.6 in)
1950	59.7 mm (2.4 in)
1951	63.6 mm (2.5 in)
1952	294.1 mm (11.6 in)
1953	101.6 mm (4.0 in)
1954	87.4 mm (3.4 in)
1955	151.4 mm (6.0 in)
1956	58.2 mm (2.3 in)
1957	114.1 mm (4.5 in)
1958	89.1 mm (3.5 in)
1959	95.5 mm (3.8 in)
1960	73.1 mm (2.9 in)
1961	60.0 mm (2.4 in)
1962	102.1 mm (4.0 in)
1963	157.2 mm (6.2 in)
1964	86.9 mm (3.4 in)
1965	89.4 mm (3.5 in)
1966	101.9 mm (4.0 in)
1967	48.3 mm (1.9 in)
1968	85.1 mm (3.4 in)
1969	51.5 mm (2.0 in)
1970	72.4 mm (2.9 in)
1971	130.1 mm (5.1 in)
1972	108.7 mm (4.3 in)
1973	122.5 mm (4.8 in)
1974	77.7 mm (3.1 in)
1975	129.5 mm (5.1 in)
1976	58.4 mm (2.3 in)
1978	69.1 mm (2.7 in)
1980	n/a
1981	88.2 mm (3.5 in)
1982	75.0 mm (3.0 in)
1983	63.8 mm (2.5 in)
1984	130.8 mm (5.1 in)
1985	90.9 mm (3.6 in)
1986	79.5 mm (3.1 in)
1987	65.0 mm (2.6 in)
1988	137.1 mm (5.4 in)
1989	83.0 mm (3.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Riverton, 1948 to 1989. The record is 42 days in 1988, marked on the chart; the median year is 23 days.

Longest dry spell (CDD) at Riverton by year
Year	Longest dry spell (CDD)
1948	15 days
1949	22 days
1950	22 days
1951	18 days
1952	32 days
1953	24 days
1954	29 days
1955	21 days
1956	21 days
1957	20 days
1958	31 days
1959	28 days
1960	26 days
1961	29 days
1962	40 days
1963	22 days
1964	31 days
1965	22 days
1966	23 days
1967	25 days
1968	39 days
1969	25 days
1970	21 days
1971	15 days
1972	23 days
1973	40 days
1974	15 days
1975	23 days
1976	33 days
1978	22 days
1980	n/a
1981	21 days
1982	16 days
1983	19 days
1984	28 days
1985	17 days
1986	19 days
1987	27 days
1988	42 days
1989	25 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

36 years, 1949 to 1989

A day with at least 53.9 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 135.2 mm (5.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Riverton: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	53.9 mm (2.1 in)
5 years	72.3 mm (2.8 in)
10 years	85.8 mm (3.4 in)
25 years	104.3 mm (4.1 in)
50 years	119.3 mm (4.7 in)	Longer than the 36 years of record
100 years	135.2 mm (5.3 in)	Longer than the 36 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, 36 years of values from 1949 to 1989.

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: 149.4 mm (5.9 in) in 1952; 91.7 mm (3.6 in) in 1955; 87.6 mm (3.4 in) in 1966.

Download the Data

Data for Riverton standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Riverton 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 2026-10-16 (16 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).

Days with data per year at Riverton
Year	Days with data	Share of year	Complete
1968	151	41%	No
1969	31	8%	No
1970	119	33%	No
1971	92	25%	No
1972	182	50%	No
1973	240	66%	No
1974	88	24%	No
1975	54	15%	No
1978	27	7%	No